INNS Control Strategy 2020/21

INVASIVE NON-NATIVE SPECIES REPORT and CONTROL STRATEGY for Riparian plants

YORKSHIRE DERWENT CATCHMENT November 2020

Updated by Vanessa Barlow 2020 Original methodology: Matt Cross 2017

Yorkshire Wildlife Trust 1 St. George’s Place York YO24 1GN Tel: 01904 659570 Email: [email protected] www.ywt.org.uk

INNS Report and Control Strategy

Table of Contents 1 Introduction ...... 5 1.1 The Yorkshire Derwent Catchment ...... 5 1.2 River Derwent SSSI ...... 5 1.3 Invasive Non-Native Species (INNS) ...... 6 1.3.1 Relevant INNS Legislation ...... 7 2 INNS status in the Yorkshire Derwent Catchment ...... 9 3 Determining Priorities ...... 16 4 Aims and Objectives ...... 18 4.1 Treatment Objectives ...... 18 4.2 Surveying Objectives ...... 18 4.3 Volunteer Involvement ...... 19 5. Preventing Further Infection ...... 19 6 Sub-Catchment Descriptions in 2020 and Recommendations ...... 20 Rye ...... 21 Raisdale Beck ...... 21 River Seph from source to Ledge Beck ...... 22 Ledge Beck ...... 23 Hodge Beck ...... 24 River Dove from source to Hodge Beck ...... 25 River Seven from source to Hartoft Beck ...... 26 Hartoft Beck ...... 27 River Rye from source to River Seph ...... 28 River Seph from Ledge Beck to River Rye...... 29 Bogmire Gill ...... 30 Bonfield Gill ...... 31 Catter Beck / Hutton Beck ...... 32 River Seven from Hartoft Beck to Little Beck ...... 33 Little Beck ...... 34 Pickering Beck from source to Levisham Beck ...... 35 Levisham Beck ...... 36 Gundale Beck ...... 37 Hartoft Beck ...... 38 Costa Beck from source to Pickering Beck ...... 39 River Seven from Little Beck to Catter Beck ...... 40

INNS Report and Control Strategy

River Dove from Hodge Beck to River Rye ...... 41 Walmouth Beck ...... 42 River Riccal ...... 43 Borough Beck...... 44 Sledhill Gill ...... 45 Spring Wood ...... 46 River Rye from River Seph to Holbeck ...... 47 River Seven from Catter Beck to River Rye ...... 48 White Beck ...... 49 River Rye from Holbeck to River Seven ...... 50 Costa Beck from Pickering Beck to River Rye ...... 51 Holbeck ...... 52 Marrs Beck ...... 53 Wath Beck ...... 54 River Rye from River Seven to River Derwent ...... 55 Redbridge Sewer ...... 56 Upper Derwent ...... 57 Lownorth Beck ...... 57 River Derwent from source to Black Beck ...... 58 Burniston Beck / Sea Cut / Scalby Beck to North Sea ...... 59 Lowdales Beck ...... 61 Thornton Beck / Dalby Beck / Staindale Beck ...... 62 Troutsdale Beck ...... 63 River Derwent from Black Beck to River Rye ...... 64 The Syme ...... 65 Ebberston Beck ...... 66 Brompton Beck ...... 67 Ruston Beck ...... 68 Seamer Drain ...... 69 Eastfield Drain & Scarborough ...... 70 River Hertford & Filey ...... 71 Sherburn Beck ...... 72 Scampston Beck ...... 73 Middle Derwent ...... 74 Spital Beck / Bulmer Beck / Ings Beck ...... 74 Cram Beck ...... 75

INNS Report and Control Strategy

River Derwent from River Rye to Kirkham ...... 76 Settrington Beck ...... 77 Menethorpe Beck ...... 78 River Derwent from Kirkham to Elvington Beck ...... 79 Barlam Beck / Skirpen Beck ...... 80 Lower Derwent ...... 81 Gowthorpe Beck ...... 81 Bishop Wilton Beck ...... 82 Pocklington Beck from source to Bielby Beck ...... 83 Blackfoss Beck ...... 84 Pocklington Beck from Bielby Beck to River Derwent ...... 85 Bielby Beck ...... 86 River Derwent from Elvington Beck to River Ouse ...... 87 Fleet Dike ...... 88 Lowmoor Drain ...... 89 Fleet Dike ...... 90 8 Treatment Methods...... 91 8.1 Giant hogweed Heracleum mantegazzianum ...... 91 8.2 Japanese knotweed Fallopia japonica ...... 91 8.3 American skunk-cabbage Lysichiton americanus ...... 91 8.4 New Zealand pigmyweed Crassula helmsii ...... 91 8.5 Himalayan balsam Impatiens glandulifera ...... 92 8.6 Rhododendron ...... 92 8.7 Monkey flower Mimulus guttatus ...... 92 8.8 Orange balsam Impatiens capensis ...... 92 Appendices ...... 93 Appendix 1: Data collection ...... 93 Appendix 2: INNS Calendar ...... 94 Appendix 3: Survey Record Sheet ...... 95 Appendix 4: Treatment Record Sheet ...... 96

INNS Report and Control Strategy

1 Introduction The 2020 update of this report has been funded by the Environment Agency’s ‘Doing More for the Derwent’ project which primarily focusses on the Derwent SSSI area. For detailed information on work carried out this year please see ‘Doing More for the Derwent INVASIVE NON-NATIVE SPECIES TREATMENT REPORT 2020/21’. Other work carried out by partners is also collated in this strategy. 1.1 The Yorkshire Derwent Catchment The Yorkshire Derwent is the largest single river catchment in Yorkshire. It has its headwaters in the North York Moors and flows south from there through the lowlands of the Vale of Pickering and Vale of York to its confluence with the River Ouse at Barmby Barrage. The Vale of Pickering was formerly dominated by carr woodland and has subsequently been extensively drained. The River Derwent’s passage through the Vale of York is situated within a flood plain. The upland land use is predominately a mixture of dry heath grouse moors and coniferous forestry whilst the lowland reaches are dominated by agricultural which is mostly arable.

The Yorkshire Derwent is made up of four operational catchments: The Lower Derwent, Middle Derwent, Upper Derwent and Rye (Figure 1). Within those there are seventy waterbody catchments which will be referred to as sub-catchments in this document: ten in the Lower Derwent, seven in the Middle Derwent, seventeen in the Upper Derwent and thirty-six in the Rye. The catchment is largely rural with the towns of Malton, Pickering and Pocklington being the larger urban centres. Operationally, the Derwent catchment also encompasses areas of land between it and the coast along its north east boundary, this includes the urban centres of Scarborough and Filey.

The catchment includes several designated sites including, most notably, the dry heath moors which are a Site of Special Scientific Interest (SSSI), Special Protection Area (SPA) and Special Area of Conservation (SAC) and the River Derwent itself which, south of its confluence with the Rye, is a SSSI and, in the Lower Derwent Valley, an SPA. The catchment includes several nature reserves including the Lower Derwent Valley National Nature Reserve (NNR) (a designated SPA and SAC) and the Forge Valley NNR. More than half the North York Moors National Park falls within the catchment, as does most of the Howard Hills AONB (HHAONB) (Figure 1). 1.2 River Derwent SSSI The River Derwent Site of Special Scientific Interest (SSSI) covers a large part of the Derwent catchment, and is influenced by all 4 sub-catchments. It stretches 70km from its confluence with the River Rye down to Barmby Barrage where it meets the River Ouse (see fig. 4). It is noted for its classic lowland river profile, alongside diverse communities of aquatic plants, fish, invertebrate and breeding birds. Yet due to increasing human pressures the River Derwent is suffering. According to Natural England, as of 2020 8 of the 21 SSSI units are failing. Surrounding land management and modification of the river itself has gravely impacted the ecological health of the river.

A key issue of the SSSI failure is excessive sedimentation in watercourses, causing deterioration of aquatic ecosystems. INNS have been linked to higher soil erosion in riparian zones compared to native species. For example, Himalayan balsam dies back in winter leaving large areas of bare ground, increasing the risk of erosion and introducing fine sediment into the watercourse. Lack of bank side shelter and shading is another key issue on the River Derwent SSSI, the removal of plant INNS has been highlighted as a potential solution to this in the ‘Restoring the Yorkshire Derwent’ Report (2010). This will in-turn create space for native plants to re-colonise, providing natural habitat and food for wildlife. Addressing INNS on the River Derwent will therefore have a positive impact on the SSSI.

INNS Report and Control Strategy

1.3 Invasive Non-Native Species (INNS) Information on INNS themselves can be found on the GB Non-Native Species Secretariat (NNSS) website: www.nonnativespecies.org. Yet information on some species found in the Derwent Catchment, such as monkey flower and orange balsam, is limited. Other details with specific information on INNS in Yorkshire can be found on the Yorkshire Invasive Species Forum (YISF) website - INNS Mapper: www.ywt-data.org/inns-mapper. This report only covers information specific to the Derwent catchment and non-native plant species. There are several INNS animals recorded in the Derwent catchment including signal crayfish, American mink and killer shrimp. Details of animal INNS can also be found on the NNSS website. Several non-native pathogens are also present in the Derwent catchment. Most notably those affecting trees including Phytophthora and Chalara. Details of tree diseases can be found on the Forestry Commission’s website: https://www.gov.uk/guidance/identify- a-tree-pest-or-disease-overview.

The biggest threat INNS pose is soil erosion, leading to increased sediment and flood risk and loss of in-channel species and bank and instream habitats. INNS can pose a public health threat and others be economically detrimental by degrading property or affecting recreation and tourism.

INNS Report and Control Strategy

1.3.1 Relevant INNS Legislation UK

• Wildlife & Countryside Act 1981 – covering the planting or growing of certain INNS and crucially ‘allowing [INNS] to escape into the wild’. • Environment Protection Act 1990 – covering ‘harmful deposit, treatment or disposal etc. of waste’. Which includes both INNS themselves and herbicides. • Hazardous Waste Regulations 2005 – covering INNS treated with herbicides.

• EU Invasive Alien Species regulations (1143/2014) – affording protection to native biodiversity and public help. • The Water Framework Directive 2000/60/EC – requiring waterbodies to have good chemical and ecological status. It is recognised that INNS can have a detrimental effect on waterbodies attaining good ecological status.

The main issue from the legislation is that landowners and land managers have a responsibility to prevent the spread of INNS by controlling these species on their land. This is not always recognised and seldom enforced. Yorkshire Derwent Catchment Partnership (YDCP) recognises that enforcement may not always be the best option as many landowners don’t have the resources to deal with the INNS problems they face, and these problems are not always a result of their own actions.

Providing incentives to dealing with INNS can be far more effective such as highlighting people’s responsibility to their neighbours and peers and contributing to environmental improvements. It is also often the case that people are unaware of the problems posed by INNS and education of this can lead to individuals taking action. There will, however, be cases where enforcement must be resorted to if landowners or managers knowingly cause or exacerbate an INNS problem.

The legislation also makes provision for the proper disposal of INNS as a waste material which is particularly relevant when considering the transmission of INNS. This is particularly relevant for species found in urban settings that are likely to be disposed of inappropriately and easily reproduce from that waste material.

From a conservation point of view the most relevant legislation is the Water Framework Directive which puts an onus on land managers and conservation organisations to deal with INNS to improve water quality and biodiversity. This is the main reason for YDCP addressing this issue as it falls under two of the partnership’s key objectives being ‘securing better…water quality’ and ‘Create extensive habitat connectivity and species resilience’.

INNS Report and Control Strategy

Figure 1. The Yorkshire Derwent catchment and its statutory UK designations. As well as the NNR’s/LNR’s the EU designations (SAC/SPA) correlate to SSSI’s so aren’t depicted.

INNS Report and Control Strategy

2 INNS status in the Yorkshire Derwent Catchment The distribution of INNS in the Derwent catchment is detailed below along with the major threats they pose to the catchment:

• Giant hogweed (Heracleum mantegazzianum) – several large and very well-established infestations in the Middle Derwent around, and just north of, Stamford Bridge and a well- established instance in the Upper Derwent (Figure 2). As well as being a threat to biodiversity by displacing native species, giant hogweed also poses a threat to public health due to production of phytotoxic sap which cause severe burns on human skin. The extent of the problem in the Derwent catchment does not currently seriously affect recreational actives and, as a consequence, economic interests of tourism etc.

• Himalayan balsam (Impatiens glandulifera) – widespread and prevalent throughout the Rye and the lowland part of the catchment, and present in some parts of the North York Moors (Figure 4). Himalayan balsam is significantly under recorded throughout the lowland part of the catchment. Himalayan balsam can be very dominant and almost entirely exclude other ground flora species making it a serious threat to biodiversity. As an annual plant it can leave extensive areas of bare ground which can lead to increased sediment run off in winter and this issue is one of the main status failings of the River Derwent SSSI.

• Japanese knotweed (Fallopia japonica) – several instances in Scarborough and its suburbs along with instances in Malton and Filey with isolated reports throughout the catchment (Figure 5). Currently this is restricted mostly to urban areas and can therefore pose an economic threat by reducing the value of infected properties. Further spread could lead to threats to biodiversity due to it dominating and excluding native species.

• Rhododendron (Rhododendron ponticum) – prolific in many woodlands throughout the catchment particularly the foothills and plantations of the North York Moors (Figure 6). This species is significantly under recorded especially in the plantations and woodlands of the Rye and Upper Derwent Operational Catchments. This species can be very dominant and outcompetes native species, which it is doing in some of the more established stands in the Upper Derwent. Rhododendron also has the capacity to act as a vector for Phytophthora, a group of fungal like pathogens that attack a wide range of plants and has a propensity to establish in woodlands and plantations where it can consequently cause serious damage because of this.

• Other INNS; American skunk-cabbage (Lysichiton americanus), floating pennywort (Hydrocotyle ranunculoides), monkey flower (Mimulus guttatus), New Zealand pigmyweed (Crassula helmsii), water fern (Azolla filiculoides) – all of these species are restricted to a small number of locations and not prolific at any of those sites (Figure 6).

INNS Report and Control Strategy

Table 1 below summarises the extent of INNS in the Derwent’s sub-catchments. The following maps details the locations of the various INNS although it is likely most are under recorded, particularly Himalayan balsam and Rhododendron and their extent is therefore not truly represented.

Table 1. Number of sub-catchments with INNS species surveyed and/or treated. *likely to be under recorded #including Scarborough and Filey as two additional catchments.

Species Most Number of Number of Total recent catchments catchments (out of record where where 72#) surveyed surveyed and/or treated

Giant hogweed 2020 5 10 15 Himalayan balsam* 2020 24 20 44 Japanese knotweed 2020 5# 10 15 Rhododendron* 2018 5 - 5 New Zealand pigmyweed 2017 3 1 4 American skunk-cabbage 2016 1 - 1 Orange balsam 2020 2 2 2 Water fern 2014 1 - 1 Floating pennywort 2013 1 - 1 Monkey flower 2019 2 - 2 Any species 55*#

INNS Report and Control Strategy

Figure 2. Giant hogweed surveyed in the Derwent catchment since 2010. Data obtained from various sources including Plant Tracker app, INNS Mapper, East Yorkshire Rivers Trust, North York Moors National Park and East Riding of Yorkshire Council. Most recent records presented in front of older records.

INNS Report and Control Strategy

Figure 3. Giant hogweed treated in the Derwent catchment since 2015. Green dots represent small isolated cases. Treatment carried out by Yorkshire Derwent Catchment Partnership, Yorkshire Wildlife Trust, private landowners, East Yorkshire Rivers Trust, Hutton Ambo Parish Council and Scalby Beck Anglers club.

INNS Report and Control Strategy

Figure 4. Himalayan balsam surveyed and/or treated in the Derwent catchment since 2010. Blue dots indicate areas of treatment. Green dots indicate areas where Himalayan balsam has been found whilst surveying. Data obtained from Yorkshire Derwent Catchment Partnership, Plant Tracker app, North York Moors National Park, Howardian Hills, Environment Agency, East Yorkshire Rivers Trust, Yorkshire Wildlife Trust, Huttons Ambo Parish Council.

INNS Report and Control Strategy

Figure 5. Japanese Knotweed surveyed and/or treated in the Derwent catchment since 2010. Blue dots indicate areas of treatment. Green dots indicate areas where Japanese knotweed has been found whilst surveying. Treatment records presented in front of survey records. Data obtained from Yorkshire Invasive Species Forum, Environment Agency, Plant Tracker App, North York Moors National Park and Scarborough Borough Council.

INNS Report and Control Strategy

Figure 6. Other INNS species surveyed and/or treated in the Derwent catchment since 2010.Data obtained from North York Moors National Park, Yorkshire Invasive Species Forum, Yorkshire Wildlife Trust, Environment Agency, Yorkshire Derwent Catchment Partnership, Plant Tracker app and East Yorkshire Rivers Trust.

INNS Report and Control Strategy

3 Determining Priorities The following priorities will underpin the aims and objectives in section 4 and recommendations in section 7 of this document for the targeting of the limited resources, with primary funding coming from River Derwent SSSI restoration.

• Focusing on Watercourses – This is because they are one of the main natural vectors for transmission of INNS, many of which are semi-aquatic plants. The main waterbodies of the River Derwent, including tributaries, totals 1054.97km.

• Top Down Approach – Each sub-catchment has been ranked both in terms of the amount of watercourse above it and the amount below (1-52, as some of the seventy sub-catchments have the same score) which are combined to give an overall priority ranking (Figure 7). This allows comparable sub-catchments to be prioritised against each other where decision making may otherwise be difficult.

• Protecting significant sites – Vulnerable and sensitive sites such as SSSI’s and nature reserves are designated as such due to their high conservation value. For example, the River Derwent SSSI, which spans 70km at the heart of the catchment. INNS can therefore have a more serious and detrimental effect to the native species at these sites, and wider biodiversity of the catchment, than at places with lower conservation value.

• Early Intervention – Dealing with outbreaks before they become very established and a serious problem can prevent the formation of a significant seed bed and potential infection downstream and beyond. Immediate action on small scale infections will prevent their escalation and save resources in the long run.

INNS Report and Control Strategy

Figure 7. The 70 Derwent waterbody catchments ranked based on the amount of watercourse above and below each sub-catchment, with Rank 1 being the highest priority for INNS treatment and Rank 52 being the lowest. Note: Some sub-catchments have the same ranking.

INNS Report and Control Strategy

4 Aims and Objectives The ultimate aim is to eradicate all INNS within the Derwent Catchment, but this may be unrealistic in the case of Himalayan balsam and Rhododendron ponticum. This is due to the extent of the problem with both and the resources available to deal with them. Due to the prevalence of Himalayan balsam and Rhododendron nationally the chances of continuous reinfection are also very high. It is though, realistic to eradicate Himalayan balsam in certain discreet areas especially where either; the chance of reinfection is low and/or the chance of infecting a site with conservation value is high.

Realistically the majority of the funding comes from Doing More for the Derwent which is focussed primarily on the Derwent SSSI and is not sufficient to cover Himalayan balsam most of which is upstream. 4.1 Treatment Objectives The short to medium term treatment objectives are;

• Eradicate giant hogweed from the catchment. A medium sized problem which is mostly limited to a discreet area in the Middle Derwent. • Eradicate Himalayan balsam within and threatening sites with conservation designations. Primarily the NYMNP and HHAONB as these encompass the headwaters of the Upper Derwent and Rye catchments. Despite the River Derwent SSSI/SAC and the Lower Derwent Valley SAC/SPA/NNR having extremely high conservation value the extent and seriousness of the infections of Himalayan balsam higher up the catchment from these sites excludes immediate work on them being a priority other than where specific land managers have the resources to prevent current infections increasing in severity. In the longer-term eradication from sub- catchments with no watercourses above them should be considered. • Eradicate Japanese knotweed outside of Scarborough whilst significantly reducing its occurrence in Scarborough. Addressing the Japanese knotweed infestations in Scarborough will be limited by the geographical restrictions on the current EA resources available to deal with the problem. • Prevent the spread of Rhododendron from infected areas along watercourses. This may well prevent further infection downstream but in the longer term will lead to backing up of an infestation to the point where treatment starts. • Completely eradicate the other INNS recorded being American skunk-cabbage, floating pennywort, monkey flower, New Zealand pigmyweed and water fern. • Eradicate Himalayan balsam primarily in the NYMNP and HHAONB as these encompass the headwaters of the Upper Derwent and Rye catchments. Despite the River Derwent SSSI/SAC and the Lower Derwent Valley SAC/SPA/NNR having extremely high conservation value, the extent and seriousness of the infections of Himalayan balsam higher up the catchment from these sites excludes immediate work on them being a priority. In the longer-term eradication from sub-catchments with no watercourses above them should be considered. 4.2 Surveying Objectives As well as treating INNS, surveying also forms an important part of the work in helping to inform what action should be taken. The main purposes for surveying are:

• Determining both the extent and/or source of known infections. • Verifying doubtful records. • Surveying watercourses with no current INNS data. • Re-surveying immediately after treatment to confirm effectiveness of treatment. © Yorkshire Wildlife Trust 2020 18

INNS Report and Control Strategy

• Re-surveying areas deemed free of INNS every three years to record new infections.

The surveying of known infections was initially prioritised over the surveying of stretches where no data exists. This will then allow for more immediate action to be coordinated to address known infections. There is however limited funding for this. 4.3 Volunteer Involvement Volunteers can play an important role in combatting INNS and carry out a wide range of tasks depending on the level of involvement they want and the skills they can bring. Recruiting volunteers and upskilling them should therefore be viewed as a priority. Establishing groups of volunteers and giving those that are willing the opportunity to lead those groups can significantly increase the amount of work that can be achieved.

YDCP began recruiting and training a small number volunteers in 2017 primarily dealing with surveying (a total of 222km of the Derwent Catchment waterbodies have been surveyed so far) and some task days treating Himalayan balsam. During this period volunteers were given the opportunity to take a more involved role by following the development progression outlined below:

1. Mass participation, untargeted surveys.

2. Targeted volunteer surveys.

3. Community task days led by volunteers at priority sites.

4. Targeted treatment by trained volunteers.

In 2020, due to the Covid-19 global pandemic, YDCP were not able to recruit any new volunteers and many existing volunteers were unable to carry out surveying. A limited number of volunteers did carry out survey work in the catchment, details of this can be found in the document ‘Annual INVASIVE NON-NATIVE SPECIES TREATMENT REPORT 2020/21’, which is available upon request.

5. Preventing Further Infection INNS have the capacity to spread through natural vectors such as watercourses and wild animals. Human activity however is one of the most frequent causes of transmission and infection, often unknowingly but also through lack of education or suitable procedures to take the issue more seriously. The most common human activities which cause transmission are:

• Importation of contaminated material. This is generally in the commercial sector but can also be non-commercial. • Failure to properly decontaminate when leaving an infected site. This can range from commercial activities involving plant/machinery such as forestry contractors to recreational activities where walking boots or waders are used.

Raising awareness of INNS is one of the key issues when attempting to prevent further infections. This includes motivating action by providing information that highlights the detrimental effect of INNS as well as advice on how to prevent INNS transmission.

INNS Report and Control Strategy

Good advice on preventing transmission is available from the NNSS website through their ‘Check, Clean, Dry’ campaign which highlights how to carry out effective biosecurity measures; http://www.nonnativespecies.org/checkcleandry/. This is especially relevant for people visiting places where there are known or potential infections. Targeting groups that may encounter INNS such as angling clubs, walking groups should therefore be a priority.

Organisations carrying out INNS treatment have a responsibility to pay particular attention to biosecurity especially when disposing of material. Rhizomatous species such as American skunk- cabbage can easily regrow from fragments of root. Both Japanese knotweed and aquatic plants including floating pennywort and New Zealand pigmyweed can propagate from very small pieces of organic material.

6 Sub-Catchment Descriptions in 2020 and Recommendations The following gives explanation to the descriptions of and recommendation for each sub-catchment. A summary of the general recommendations for specific INNS follow in section 8. Other partner organisations such as Forestry Commission, North York Moors National Park Authority (NYMNPA) and Howardian Hills Area of Outstanding Natural Beauty (HHAONB) are carrying out INNS work, YDCP will offer support where it is needed at priority sites or compliment their work outside but close to their treatment sites.

• Where several becks are listed under the same bullet point this indicates they are part of the same watercourse which changes its name as it progresses.

• Only the following designations are listed: o SSSI – Site of Special Scientific Interest o SAC – Special Area of Conservation o SPA – Special Protection Area o NNR – National Nature Reserve o LNR – Local Nature Reserve o NYMNP – North York Moors National Park o HHAONB – Howard Hills Area of Outstanding Natural Beauty

• INNS recorded and treated are followed by the most recent year each was done.

• Recommendations for surveys of known infections will take priority over new surveys.

Each sub-catchment description is accompanied by a map, detailing the INNS and major watercourses in each catchment. Description and recommendations have been updated upon the completion of the 2020 INNS work.

INNS Report and Control Strategy

Rye

Raisdale Beck

EA ID GB104027068640 Centroid NGR NZ 53924 01003 Area 1,304 ha Major • Raisdale Beck watercourses Designations • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 1

INNS recorded • Himalayan balsam – 2020 INNS treated- Year • Himalayan balsam – 2020

Description Recommendations Himalayan balsam has been recorded very close to Treat the Himalayan balsam. the confluence with the River Seph making it Survey the main watercourse. possible the infection has backed up from there. This could be accomplished as part of the There are no records further north however, so Ryevitalise programme. surveying is needed to determine the source. Treat known infection Y Treatment of the known Himalayan balsam can be absorbed into the NYMNPA’s work on the River Survey known infection Seph. Treatment work was carried out by NYMNPA New survey Y in 2019 using Yorkshire Water funding. This treatment and survey work has continued in 2020 via NYMNPA’s Ryevitalise programme.

INNS Report and Control Strategy

Rye River Seph from source to Ledge

EA ID GB104027068591 Centroid NGR NZ 56523 00002 Area 1,980 ha Major • River Seph watercourses • Bilsdale Beck Designations • Broughton Bank SSSI • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 4 INNS recorded • Himalayan balsam – 2020 INNS treated- Year • Himalayan balsam – 2020

Description Recommendations Himalayan balsam has been recorded and treated Survey upstream of Raisdale Beck to extensively by the NYMNPA along the River Seph determine the source/extent of the from its confluence with Raisdale Beck as well as Himalayan balsam. away from the river. Himalayan balsam treatment Survey the main watercourse. has been carried out in 2020 by NYMNPA’s This could be accomplished as part of the Ryevitalise programme. Ryevitalise programme. Treat known infection Y Survey known infection Y New survey

INNS Report and Control Strategy

Rye Ledge Beck

EA ID GB104027068620 Centroid NGR SE 58845 98693 Area 1,309 ha Major • Ledge Beck watercourses • Tarn Hole Beck • Tripsdale Beck, North Gill Designations • Tripsdale SSSI • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 2 INNS recorded None INNS treated N/A

Description Recommendations No INNS were found in the 2020 INNS survey carried Re-survey in 2023. out along Ledge Beck by NYMNPA’s Ryevitalise Treat known infection programme. Survey known infection New survey

INNS Report and Control Strategy

Rye Hodge Beck

EA ID GB104027068250 Centroid NGR SE 64469 92800 Area 5,852 ha Major watercourses • Hodge Beck • Badger Gill • Bloworth Slack • Howkeld Beck • Ouse Gill Designations • Kirkdale Cave SSSI • Sleightholme Dale SSSI • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 17 INNS recorded- Year • American skunk- cabbage – 2016 • Himalayan balsam – 2016 INNS treated

Description Recommendations Both Himalayan balsam and American skunk- Survey to verify/determine the cabbage was recorded on or near the watercourses source/extent of the known infections. at the top of the catchment. The former is likely to Survey the main watercourse. be under recorded. Both are likely they have spread Treat the Himalayan balsam and further downstream on Hodge Beck. American skunk-cabbage on Hodge Beck and Bloworth Slack. External funding would be needed to carry out recommendations. This waterbody catchment is just outside of the Ryevitalise programme area. Treat known infection Y Survey known infection Y New survey Y

INNS Report and Control Strategy

Rye River Dove from source to Hodge Beck

EA ID GB104027068260 Centroid NGR SE 67084 94556 Area 6,041 Major watercourses • River Dove • Blakey Gill • Harland Beck • West Gill Beck Designations • Farndale SSSI • Hill House Nab SSSI • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 17 INNS recorded- Year • Himalayan balsam – 2016 • Japanese knotweed – 2018 INNS treated- Year • Japanese knotweed – 2018

Description Recommendations Himalayan balsam has been recorded on the River Survey to verify/determine the Dove at the very bottom of the catchment. The source/extent of the Himalayan balsam. Japanese knotweed treated was found away from Survey the main watercourses. the watercourses. Treat the Himalayan balsam. External funding would be needed to carry out recommendations. Treat known infection Y Survey known infection Y New survey Y

INNS Report and Control Strategy

Rye River Seven from source to Hartoft Beck

EA ID GB104027068630 Centroid NGR SE 71198 97753 Area 3,713 ha Major watercourses • River Seven • Northdale Beck, West Gill Designations • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 12 INNS recorded- Year • Himalayan balsam – 2018 INNS treated- Year • Himalayan balsam – 2018

Description Recommendations Himalayan balsam has been recorded close to the Survey to determine the source/extent of River Seven at its confluence with Northdale Beck. It the Himalayan balsam. is unclear whether this is the source of infections Survey the main watercourses. downstream or if it is under recorded section Treat the Himalayan balsam close to the downstream. river Seven. External funding would be needed to carry out recommendations. Treat known infection Y Survey known infection Y New survey Y

INNS Report and Control Strategy

Rye Hartoft Beck

EA ID GB104027068600 Centroid NGR SE 75392 96360 Area 1,896 ha Major watercourses • Hartoft Beck • Hamer Beck Designations • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 12 INNS recorded- Year • Rhododendron – 2012 • Himalayan balsam – 2018 INNS treated- Year • Himalayan balsam – 2018

Description Recommendations Both Himalayan balsam and Rhododendron have Survey to determine the extent of the been recorded in a plantation close to the Himalayan balsam and Rhododendron watercourse at the bottom of the catchment. infection. NYMNPA carried out Himalayan balsam treatment in Survey the main watercourse. 2018 near Harcroft beck. External funding would be needed to carry out recommendations. Treat known infection Survey known infection Y New survey

INNS Report and Control Strategy

Rye River Rye from source to River Seph

EA ID GB104027068580 Centroid NGR SE 52219 93545 Area 6223ha Major • River Rye watercourses • Arns Gill • Blow Gill, Parci Gill • Eskerdale Beck • Landhill Beck • Wheat Beck • Unnamed in Thorodale Designations • Gowerdale Windy Pits/Peak Scar SSSI • Low Pasture SSSI • Noddle End SSSI • Spring Wood, Hawnby SSSI • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 3 INNS recorded • Himalayan balsam – 2020 INNS treated- Year • Himalayan balsam – 2020

Description Recommendations Himalayan balsam has been treated not far from Survey to determine the extent of the Landhill Beck. The River Rye was surveyed in 2017 Himalayan balsam on Landhill Beck. This and found to be free of INNS up to Eskerdale Beck. could be accomplished as part of the Himalayan balsam treatment has been carried out in Ryevitalise programme. 2020 by NYMNPA’s Ryevitalise programme. Treat known infection Survey known infection Y New survey

INNS Report and Control Strategy

Rye River Seph from Ledge Beck to River Rye

EA ID GB104027068560 Centroid NGR SE 56954 93018 Area 2,199 ha Major • River Seph watercourses Designations • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 11 INNS recorded- • New Zealand Pigmyweed – Year 2014 • Himalayan balsam – 2020 INNS treated- • Himalayan balsam – 2020 Year • Japanese knotweed – 2018

Description Recommendations Himalayan balsam has been recorded and treated Treat the New Zealand pigmyweed and extensively by the NYMNPA all along the River Seph Himalayan balsam. New Zealand to its confluence with the River Rye. Himalayan pigmyweed treatment could be balsam treatment has been carried out in 2020 by completed as part of the Ryevitalise NYMNPA’s Ryevitalise programme. programme if they have the capacity. Treat known infection Y Survey known infection New survey

INNS Report and Control Strategy

Rye Bogmire Gill

EA ID GB104027068230 Centroid NGR SE 59796 92197 Area 1,020 ha Major • Bogmire Gill, watercourses Cowhouse Beck Designations • Snaper Farm Meadows SSSI • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 9 INNS recorded No data INNS treated

Description Recommendations No INNS have been recorded. Survey the main watercourse. External funding would be needed to carry out recommendation.

Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Rye Bonfield Gill

EA ID GB104027068240 Centroid NGR SE 61023 93687 Area 1,089 ha Major • Bonfield Gill watercourses Designations • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 9 INNS recorded No data INNS treated

Description Recommendations No INNS have been recorded. Survey the main watercourse. External funding would be needed to carry out recommendation. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Rye Catter Beck / Hutton Beck

EA ID GB104027068550 Centroid NGR SE 71427 90083 Area 2,343 ha Major • Catter Beck, watercourses Hutton Beck Designations • Fairy Call Beck SSSI • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 19 INNS recorded No data INNS treated

INNS Report and Control Strategy

Rye River Seven from Hartoft Beck to Little Beck

EA ID GB104027068540 Centroid NGR SE 73245 91585 Area 1,393 ha Major • River Seven watercourses • Ings Beck, Hole Beck Designations • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 14 INNS recorded No data INNS treated

Description Recommendations No INNS have been recorded but it is possible Survey the main watercourses. Himalayan balsam is present on the River Seven as it External funding would be needed to has been recorded in catchments above. carry out recommendation. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Rye Little Beck

EA ID GB104027068530 Centroid NGR SE 77199 91467 Area 1,549 ha Major watercourses • Little Beck • Cropton Beck • Sutherland Beck Designations • Cawthorn Moor SSSI • NYMNPA Priority rank 13 INNS recorded- Year • Himalayan balsam – 2018 INNS treated- Year • Himalayan balsam – 2018

Description Recommendations Himalayan balsam has been recorded by the Survey to determine the source/extent of NYMNPA in and around Cropton and close by on the the Himalayan balsam. River Seven. External funding would be needed to carry out recommendation. Treat known infection Y Survey known infection Y New survey

INNS Report and Control Strategy

Rye Pickering Beck from source to Levisham Beck

EA ID GB104027068570 Centroid NGR SE 82573 93863 Area 2,968 ha Major • Pickering Beck watercourses Designations • Newtondale SSSI • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 16 INNS recorded Partial data, none found INNS treated N/A

Description Recommendations No INNS have been recorded. Survey the main watercourse. Part of the main watercourse, to the south, was External funding would be needed to surveyed in 2017. carry out recommendation. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Rye Levisham Beck

EA ID GB104027068520 Centroid NGR SE 84055 91616 Area 1,344 ha Major • Levisham Beck watercourses Designations • Hole of Horcum SSSI • Newtondale SSSI • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 16 INNS recorded INNS treated- Year • Japanese knotweed – 2013

Description Recommendations Japanese knotweed was recorded in Lockton in Survey to determine the extent of the 2013. Japanese knotweed. Survey the main watercourse. External funding would be needed to carry out recommendations. Treat known infection Survey known infection Y New survey Y

INNS Report and Control Strategy

Rye Gundale Beck

EA ID GB104027068510 Centroid NGR SE 79955 89138 Area 1,147 ha Major • Gundale Beck watercourses Designations • Haugh and Gundale Slacks SSSI • NYMNPA Priority rank 24 INNS recorded No data INNS treated

Description Recommendation No INNS have been recorded. Survey the main watercourse. External funding would be needed to carry out recommendation. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Rye Hartoft Beck

Description Recommendations Both Himalayan balsam and Rhododendron have Survey to determine the extent of the been recorded in a plantation close to the Himalayan balsam and Rhododendron watercourse at the bottom of the catchment. infection. NYMNPA carried out Himalayan balsam treatment in Survey the main watercourse. 2018 near Harcroft Beck. External funding would be needed to carry out recommendations. Treat known infection Survey known infection Y New survey

INNS Report and Control Strategy

Rye Costa Beck from source to Pickering Beck

EA ID GB104027068480 Centroid NGR SE 77040 84352 Area 3,667 ha Major • Costa Beck, watercourses Oxfolds Beck • Ings Dike • Twelve Foot Cut Designations • Priority rank 30 INNS recorded- • Floating pennywort – 2013 Year • Water fern – 2014 • Giant hogweed – 2020 INNS treated • Giant hogweed – 2020 • Water fern – 2019

Description Recommendations Several INNS have been recorded, as noted above, Survey to verify/determine the and all on the catchment’s watercourses. A small source/extent of the known infections. patch of giant hogweed was treated at the source of Survey the main watercourses to confirm Costa Beck in 2020. reports of floating pennywort and treat if Waterfern has been treated by the Environment found. Agency on Costa Beck in 2019 using Weevils as a External funding would be needed to method of biological control. carry out recommendations. Treat known infection Y Survey known infection Y New survey

INNS Report and Control Strategy

Rye River Seven from Little Beck to Catter Beck

EA ID GB104027068490 Centroid NGR SE 74283 86771 Area 873 ha Major watercourses • River Seven Designations • Bull Ings SSSI • Cropton Banks and Howlgate Head Woods SSSI • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 27 INNS recorded- Year • Himalayan balsam – 2018 • Rhododendron – 2018 INNS treated- Year • Himalayan balsam – 2018

Description Recommendations Himalayan balsam has been recorded mostly in and Survey to verify the extent of the upstream of Sinnington but is likely to be under Himalayan balsam. recorded given the records above the catchment Treat the Himalayan balsam. and its abundance where it has been recorded. External funding would be needed to carry out recommendations. Treat known infection Y Survey known infection Y New survey

INNS Report and Control Strategy

Rye River Dove from Hodge Beck to River Rye

EA ID GB104027068190 Centroid NGR SE 71274 82936 Area 1,241 ha Major watercourses • River Dove Designations Priority rank 34 INNS recorded- Year • Himalayan balsam – 2015 INNS treated

Description Recommendations It is likely Himalayan balsam is present beyond the Survey to verify/determine the River Dove where it’s been recorded along most of source/extent of the Himalayan balsam. its length. External funding would be needed to carry out recommendations. Treat known infection Survey known infection Y New survey

INNS Report and Control Strategy

Rye Walmouth Beck

EA ID GB104027068210 Centroid NGR SE 66127 84592 Area 5,911 ha Major • Walmouth Beck watercourses • Ellerker Beck, Harome Moor Drain Designations • NYMNPA Priority rank 22 INNS recorded • Himalayan balsam – 2020 INNS treated

Description Recommendations Himalayan balsam was recorded by NYMNPA’s Survey remaining watercourses to Ryevitalise programme. identify source of infection. This could be accomplished as part of the Ryevitalise programme.

Treat known infection Survey known infection Y New survey

INNS Report and Control Strategy

Rye River Riccal

EA ID GB104027068220 Centroid NGR SE 64404 84101 Area 1,906 ha Major watercourses • River Riccal Designations • Blaiskey Bank Springs SSSI • NYMNPA Priority rank 27 INNS recorded- Year • Himalayan balsam – 2020 INNS treated • Himalayan balsam – 2020

Description Recommendations Himalayan balsam has been recorded on the River Survey to verify/determine the Riccal in the middle and bottom of the catchment source/extent of the Himalayan balsam. but is likely to be under recorded. Himalayan This could be accomplished as part of the balsam treatment has been carried out in 2020 by Ryevitalise programme. NYMNPA’s Ryevitalise programme. Treat known infection Survey known infection Y New survey

INNS Report and Control Strategy

Rye Borough Beck

EA ID GB104027068500 Centroid NGR SE 58798 87676 Area 1,365 ha Major • Borough Beck watercourses • Etton Gill Designations • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 11 INNS recorded No data INNS treated

Description Recommendations No INNS have been recorded. Survey the main watercourse. This could be accomplished as part of the Ryevitalise programme. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Rye Sledhill Gill

EA ID GB104027068201 Centroid NGR SE 53157 87200 Area 1,060 ha Major watercourses • Sledhill Gill Designations • Caydale SSSI • NYMNPA Priority rank 5 INNS recorded- Year • Himalayan balsam – 2016 INNS treated-Year • Himalayan balsam – 2013

Description Recommendations Himalayan balsam has been recorded and treated Survey to verify/determine the by NYMNPA on Sledhill Gill very close to its source/extent of the Himalayan balsam. confluence with the River Rye. It is likely this is due This could be accomplished as part of the to backing up from the River Rye. Treatment of the Ryevitalise programme. known Himalayan balsam can be absorbed into the Treat known infection Y NYMNPA’s work on the River Rye. Survey known infection Y New survey

INNS Report and Control Strategy

Rye Spring Wood

EA ID GB104027068450 Centroid NGR SE 54068 84168 Area 2,134 ha Major watercourses • Unnamed in Nettle Dale Designations • Ashberry and Reins Wood SSSI • NYMNPA Priority rank 6 INNS recorded- Year • Giant hogweed – 2011 • Himalayan balsam – 2020 INNS treated

Description Recommendations Himalayan balsam has been recorded in plantations Survey to verify/determine the to the west near Hambleton. Giant hogweed has source/extent of the giant hogweed. been recorded to the south in a plantation but this This could be accomplished as part of the record is old and needs verification. Ryevitalise programme. Himalayan balsam was found in the 2020 INNS Treat known infection survey carried out along Ledge Beck by NYMNPA’s Survey known infection Y Ryevitalise programme. New survey

INNS Report and Control Strategy

Rye River Rye from River Seph to Holbeck

EA ID GB104027068200 Centroid NGR SE 60997 83508 Area 4,931 ha Major • River Rye watercourses Designations • Ashberry and Reins Wood SSSI • Castle Hill Deer Park and Windy Pits SSSI • Nunnington Cutting and Quarries SSSI • Rievaulx Woods SSSI • Duncombe Park SSSI/NNR • NYMNPA • HHAONB Priority rank 40 INNS recorded- • Monkey flower – 2019 Year • Rhododendron – 2012 • Himalayan balsam – 2020 INNS treated - Year • Japanese knotweed – 2011 • Himalayan balsam – 2020

Description Recommendations Himalayan balsam has been recorded and treated Survey to verify the Japanese knotweed extensively by the NYMNPA and HHAONB along the was eradicated. River Rye and treated by the NYMNPA to the Park’s boundary. Treatment was continued in 2020 under Survey to determine the extent of the NYMNPA’s Ryevitalise programme. The other INNS Rhododendron. have all been recorded on or near the River Rye. Treat Monkey flower. Continue treatment of Himalayan balsam through the Ryevitalise programme. Treat known infection Y Survey known infection Y New survey Y

INNS Report and Control Strategy

Rye River Seven from Catter Beck to River Rye

EA ID GB104027068440 Centroid NGR SE 73951 81717 Area 917 ha Major watercourses • River Seven Designations • Golden Hill Pit SSSI • Green Lane Pit SSSI Priority rank 39 INNS recorded- Year • Himalayan balsam – 2018 INNS treated • Giant hogweed – 2009

Description Recommendations There are limited records of Himalayan balsam on Survey to determine the extent of the and near the River Seven to the bottom of the Himalayan balsam. catchment. It is likely that it's significantly under External funding would be needed to recorded given the amount of records above this carry out recommendation. catchment and anecdotal evidence from residents Treat known infection of Marton at the top of the catchment. Survey known infection Y New survey

INNS Report and Control Strategy

Rye White Beck

EA ID GB104027068430 Centroid NGR SE 60800 80359 Area 1,292 ha Major • White Beck watercourses Designations • NYMNPA • HHAONB Priority rank 14 INNS recorded Himalayan balsam – 2020 INNS treated

INNS Report and Control Strategy

Rye River Rye from Holbeck to River Seven

EA ID GB104027068370 Centroid NGR SE 72653 79576 Area 687 ha Major watercourses • River Rye Designations Priority rank 42 INNS recorded- Year • Himalayan balsam – 2015 INNS treated

Description Recommendations Himalayan balsam has been recorded on the River Survey to determine the extent of the Rye but is likely to be elsewhere and under recorded Himalayan balsam. generally. There are very serious problems with External funding would be needed to Himalayan balsam further upstream. carry out recommendation. Treat known infection Survey known infection Y New survey

INNS Report and Control Strategy

Rye Costa Beck from Pickering Beck to River Rye

EA ID GB104027068401 Centroid NGR SE 77579 78142 Area 2,771 ha Major watercourses • Costa Beck • Ackland Beck Designations Priority rank 43 INNS recorded- Year Himalayan balsam – 2015 INNS treated

Description Recommendations Himalayan balsam has been recorded well away Survey the main watercourses. from the watercourses but is likely to be under External funding would be needed to recorded in the catchment. carry out recommendation. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Rye Holbeck

EA ID GB104027068420 Centroid NGR SE 60891 77471 Area 5,009 ha Major watercourses • Holbeck, Burtis Beck • Syke Sewer • Thorpe Beck Designations • Horse Field, Gilling SSSI • Nunnington Cutting and Quarries SSSI • HHAONB Priority rank 25 INNS recorded- Year • Himalayan balsam – 2020 INNS treated- Year • Japanese knotweed – 2018 • Himalayan balsam – 2020

Description Recommendations Himalayan balsam has been recorded from the Survey to determine the extent of the headwaters of Burtis and all along Holbeck and is Himalayan balsam. likely to be under recorded. The Japanese knotweed Treat the Himalayan balsam. This could was recorded by HHAONB in a plantation near to be accomplished as part of the Ryevitalise Thorpe Beck. This is being treated by landowner. programme. Himalayan balsam was recorded by NYMNPA’s Survey known infection Y Ryevitalise programme. New survey Treat known infection Y

INNS Report and Control Strategy

Rye Marrs Beck

EA ID GB104027068340 Centroid NGR SE 64241 74866 Area 2,559 ha Major • Marrs Beck watercourses • Unnamed beck in Hovingham Carrs Designations • Horse Field, Gilling SSSI • HHAONB Priority rank 20 INNS recorded • Himalayan balsam – 2020 INNS treated- Year • Himalayan balsam – 2020

Description Recommendations Himalayan balsam has been treated by the HHAONB Treat Himalayan balsam. This could be and NYMNPA (Ryevitalise project). accomplished as part of the Ryevitalise programme. Treat known infection Y Survey known infection New survey

INNS Report and Control Strategy

Rye Wath Beck

EA ID GB104027068330 Centroid NGR SE 68480 73636 Area 2,653 ha Major watercourses • Wath Beck Designations • Wath Quarry SSSI • HHAONB Priority rank 27 INNS recorded- Year • Giant hogweed – 2016 • Himalayan balsam – 2020 INNS treated- Year • Himalayan balsam – 2020

Description Recommendations The HHAONB have treated the Himalayan balsam Survey to verify/determine the along the part of Wath Beck within the AONB. source/extent of the giant hogweed as Beyond the AONB the Himalayan balsam is likely to part of Doing More for the Derwent. be under recorded on Wath Beck. It has also been Survey and treat the Himalayan balsam recorded away from Wath Beck to the west. The on Wath Beck outside the AONB. This giant hogweed has been recorded away from the could be accomplished as part of the watercourse. HHAONB have continued Himalayan Ryevitalise programme. balsam treatment in 2020. Treat known infection Y Survey known infection Y New survey

INNS Report and Control Strategy

Rye River Rye from River Seven to River Derwent

EA ID GB104027068320 Centroid NGR SE 76833 74595 Area 3,164 ha Major watercourses • River Rye • Slingsby Carr Cut • Unnamed beck in Swinton Ings Designations • River Derwent SSSI/SAC • HHAONB Priority rank 47 INNS recorded- Year Himalayan balsam – 2009 INNS treated

Description Recommendations There are historic records of Himalayan balsam from Survey the main watercourse to 2009. It is likely the Himalayan balsam is significantly determine extent of Himalayan balsam. under recorded in this catchment due to the External funding would be needed to severity of its infestations upstream. carry out recommendation. Treat known infection Survey known infection Y New survey

INNS Report and Control Strategy

Rye Redbridge Sewer

EA ID GB104027068280 Centroid NGR SE 73460 73984 Area 1,586 ha Major • Redbridge Sewer watercourses Designations • The Ings, Amotherby SSSI • HHAONB Priority rank 31 INNS recorded No data INNS treated

Description Recommendations No INNS have been recorded although it is likely Survey the main watercourse. Himalayan balsam is present. External funding would be needed to carry out recommendation. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Upper Derwent

Lownorth Beck

EA ID GB104027068040 Centroid NGR SE 93994 98494 Area 3,333 ha Major watercourses • Lownorth Beck, Harwood Dale Beck • Bloody Beck • Jugger Howe Beck Designations • North York Moors SSSI/SAC/SPA • Biller Howe Dale SSSI • Castlebeck and Scar Woods SSSI • NYMNPA Priority rank 4 INNS recorded- Year • Himalayan balsam – 2018 INNS treated • Himalayan balsam – 2019

Description Recommendations Himalayan balsam has been recorded on Lownorth Continue to treat the Himalayan balsam Beck/Harwood Dale Beck and traced to a tributary on Lownorth Beck/Harwood Dale Beck being Keas Beck. The stretch was pulled by Yorkshire and Keas Beck as part of Doing more for Wildlife Trust volunteers in 2019. the Derwent. Treat known infection Y Survey known infection New survey

INNS Report and Control Strategy

Upper Derwent River Derwent from source to Black Beck

EA ID GB104027067971 Centroid NGR SE 91704 96178 Area 1,632 ha Major • River Derwent watercourses • Woof Howe Beck Designations • North York Moors SSSI/SAC/SPA • NYMNPA Priority rank 14 INNS recorded 0 INNS treated

Description Recommendations Much of the main watercourses were surveyed in Re-survey watercourse. 2017 and nothing found. External funding would be needed to carry out recommendation. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Upper Derwent Burniston Beck / Sea Cut / Scalby Beck to North Sea

EA ID GB104027067980 Centroid NGR SE 99820 92822 Area 3,213 ha Major • Burniston Beck, Cow Wath Beck watercourses • Cloughton Beck • East Syme, Lindhead Beck, Quarry Beck, Thirley Beck • Scalby Beck • Sea Cut Designations • Iron Scar and Hundale Point to Scalby Ness SSSI • NYMNPA Priority rank n/a (not hydrologically connected to rest of catchment) INNS recorded- • New Zealand pigmyweed – 2016 Year • Japanese knotweed – 2015 • Giant hogweed – 2020 • Himalayan balsam – 2018 INNS treated • Giant hogweed – 2020

Description Recommendations Himalayan balsam has been recorded on the Sea Cut Survey the main watercourses. and the bottom of Burniston Beck. Both Japanese Treat the Himalayan balsam along the knotweed and giant hogweed have been recorded in Sea Cut and Japanese knotweed on and on the outskirts of Scarborough. Scalby Beck. Scalby Beck Angling Club have treated giant External funding would be needed to hogweed along Scalby Beck since 2018. YDCP carry out recommendations. provided herbicide in 2020. Treat known infection Y Survey known infection New survey Y

INNS Report and Control Strategy

Upper Derwent Black Beck / Crosscliffe Beck / Grain Beck

EA ID GB104027067990 Centroid NGR SE 90134 93280 Area 3,390 ha Major • Black Beck, watercourses Crosscliffe Beck • Grain Beck, Long Grain • Hipperley Beck • Stockland Beck • White Beck Designations • North York Moors SSSI/SAC • NYMNPA Priority rank 7 INNS recorded- • Rhododendron – 2020 Year • Giant hogweed – 2020 • Himalayan balsam – 2017 INNS treated • Giant hogweed – 2020

Description Recommendations The plantations to the south of Crosscliffe Beck have Treat giant hogweed source on Crosscliffe a severe Rhododendron problem which is spreading Beck as part of Doing More for the down Crosscliffe and Black Becks nearly to the River Derwent. Derwent. Work with FC to address Rhododendron. There is a significant stand of giant hogweed at Red Treat known infection Y House Lake on Crosscliffe Beck which has spread Survey known infection nearly to the River Derwent. This has been treated every year since 2017, but there is a significant seed New survey bank. A small stand of Himalayan balsam was recorded on

a forestry track away from the watercourses.

INNS Report and Control Strategy

Upper Derwent Lowdales Beck

EA ID GB104027067960 Centroid NGR SE 96418 92125 Area 1,642 ha Major • Lowdales Beck, watercourses Highdales Beck • Whisperdales Beck Designations • Hackness Head Quarry SSSI • Hackness Rock Pit SSSI • NYMNPA Priority rank 10 INNS recorded 0 INNS treated

Description Recommendations The Main watercourses were surveyed in 2017 and Survey recommended as has been 3 years no INNS were present. since first survey. External funding would be needed to carry out recommendations. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Upper Derwent Thornton Beck / Dalby Beck / Staindale Beck

EA ID GB104027067950 Centroid NGR SE 86534 87945 Area 3,602 ha Major watercourses • Thornton Beck • Dalby Beck, Staindale Beck Designations • NYMNPA Priority rank 34 INNS recorded- Year • Himalayan balsam – 2013 • Japanese knotweed – 2013 INNS treated - Year • Japanese knotweed – 2013

Description Recommendations Himalayan balsam was recorded on Thornton Beck Complete new survey as last records are in the lower part of the catchment and is likely to be from 2013. under recorded in the south of the catchment. External funding would be needed to Japanese knotweed was treated away from the carry out recommendation. main watercourse. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Upper Derwent Troutsdale Beck

EA ID GB104027067910 Centroid NGR SE 91618 88705 Area 1,328 ha Major watercourses • Troutsdale Beck Priority rank 8 Designations • Troutsdale and Rosekirk Dale Fens SSSI INNS recorded- Year • Himalayan balsam – 2009 INNS treated- Year • Japanese knotweed – 2018

Description Recommendations The main watercourse was surveyed in 2017 and Re-survey main watercourse and was free of INNS, aside from the Japanese knotweed investigate historic report of Himalayan mentioned above. balsam from 2009. External funding would be needed to carry out recommendations. Treat known infection Survey known infection Y New survey Y

INNS Report and Control Strategy

Upper Derwent River Derwent from Black Beck to River Rye

EA ID GB104027067930 Centroid NGR SE 91293 81081 Area 13,569 ha Major • River Derwent watercourses Designations • Cockrah Wood SSSI • Raincliffe & Forge Valley Woods SSSI • Spiker's Hill Quarry SSSI • Forge Valley Woods NNR • NYMNPA Priority rank 46 INNS recorded Giant hogweed - 2019 INNS treated Giant hogweed – 2020 Himalayan balsam – 2020

Description Recommendations One giant hogweed plant was found and removed in Re-survey in 2023. 2019, and again in 2020, likely to have come from Treat known infection the large source at red house lake. It is also very Survey known infection likely Himalayan balsam will be present. Main river was surveyed in 2020, no INNS were New survey found. Himalayan balsam was treated by Raincliffe Woods Community Enterprise in 2020.

INNS Report and Control Strategy

Upper Derwent The Syme

EA ID GB104027068460 Centroid NGR SE 82202 83049 Area 2,618 ha Major watercourses • The Syme, Tofts Swang Drain, Midsyke Beck Designations • NYMNPA Priority rank 33 INNS recorded- Year • Giant hogweed – 2020 INNS treated • Giant hogweed – 2020

Description Recommendations Emerging in the foothills of the North York Moors to Continue treatment of summer tree the Vale of Pickering where the main watercourse bridge. Surveying to determine the joins Thornton Beck shortly before it joins the River source of infection. Recommendations to Derwent. Mostly mixed agriculture with some be delivered through Doing More for the woodland/plantation. The catchment has no Derwent. watercourses above. Infection at Summer House Bridge was treated in Treat known infection Y 2020, around 15 flowering plants, source of this Survey known infection Y infection is unknown. New survey

INNS Report and Control Strategy

Upper Derwent Ebberston Beck

EA ID GB104027067890 Centroid NGR SE 89632 83973 Area 917 ha Major • Ebberston Beck watercourses Designations Priority rank 29 INNS recorded No data INNS treated

Description Recommendations No INNS have been recorded but Himalayan balsam Survey main watercourse. is likely to be present. External funding would be needed to carry out recommendation. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Upper Derwent Brompton Beck

EA ID GB104027067870 Centroid NGR SE 93050 83506 Area 1,408 ha Major • Brompton Beck watercourses Designations Priority rank 26 INNS recorded- • Himalayan balsam – Year 2013 INNS treated

Description Recommendations Himalayan balsam has been recorded in the village Treat Himalayan balsam if is still present. of Brompton-by-Sawdon, in a fishpond, close to the Survey the main watercourse (Brompton source of Brompton Beck. Beck). Treat known infection Survey known infection Y New survey

INNS Report and Control Strategy

Upper Derwent Ruston Beck

EA ID GB104027067900 Centroid NGR SE 94946 84929 Area 2,168 ha Major watercourses • Ruston Beck • Beedale Beck • Sawdon Beck Designations • Ruston Cottage Pasture • NYMNPA Priority rank 23 INNS recorded - Year No data INNS treated

Description Recommendations No INNS have been recorded but it is likely there will Survey the main watercourses. be Himalayan balsam present. External funding would be needed to carry out recommendation. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Upper Derwent Seamer Drain

EA ID GB104027067880 Centroid NGR TA 00948 84121 Area 1,936 ha Major • Seamer Drain watercourses Designations • Betton Farm Quarries SSSI Priority rank 18 INNS recorded No data INNS treated

Description Recommendations No INNS have been recorded but it is likely there will Survey the main watercourse. be Himalayan balsam present. External funding would be needed to carry out recommendation. Treat known infection Survey known infection New survey Y

INNS Report and Control Strategy

Upper Derwent Eastfield Drain & Scarborough

EA ID GB104027073281 Centroid NGR TA 05178 82984 Area 2,215 ha Major • Eastfield Drain, watercourses New Dike Designations • The Dell LNR Priority rank 15 INNS recorded- • Giant hogweed – 2016 Year • New Zealand pigmyweed – 2009 • Japanese knotweed – 2016 INNS treated

Description Recommendations Japanese knotweed and New Zealand pigmyweed Survey to verify and determine the extent have been recorded on the outskirts of Eastfield. of the New Zealand pigmyweed in Outside of the catchment, one record of giant Eastfield. hogweed was found and Japanese knotweed has Survey the main watercourse. also been recorded in many places in Scarborough. Treat giant hogweed and Japanese knotweed in Scarborough. External funding would be needed to carry out recommendations. Treat known infection Y Survey known infection Y New survey Y

INNS Report and Control Strategy

Upper Derwent River Hertford & Filey

EA ID GB104027067811 Centroid NGR TA 05451 79299 Area 4,522 ha Major watercourses • River Hertford Designations • Spell Howe Plantation SSSI Priority rank 22 INNS recorded- Year Japanese knotweed – 2009 INNS treated

Description Recommendations The adjacent catchment to the east issues directly Survey to verify/determine the into the sea but is appended to the Derwent source/extent of the Japanese knotweed catchment by the EA operationally. This includes infection. Filey which has records of Japanese knotweed. Survey the main watercourse. External funding would be needed to carry out recommendations. Treat known infection Survey known infection Y New survey Y

INNS Report and Control Strategy

Upper Derwent Sherburn Beck

EA ID GB104027067800 Centroid NGR SE 93703 76776 Area 1,811 ha Major • Sherburn Beck, watercourses East Beck Designations • East Heslerton Brow SSSI • Sked Dale SSSI Priority rank 28 INNS recorded No data INNS treated

INNS Report and Control Strategy

Upper Derwent Scampston Beck

EA ID GB104027067790 Centroid NGR SE 88473 72558 Area 2,486 ha Major • Scampston Beck, watercourses Newton Beck, Blakey Beck, Wintringham Beck Designations • Ladyhills SSSI • Wintringham Marsh SSSI Priority rank 32 INNS recorded No data INNS treated

INNS Report and Control Strategy

Middle Derwent

Spital Beck / Bulmer Beck / Ings Beck

EA ID GB104027063580 Centroid NGR SE 67260 67634 Area 5,911 ha Major • Braisthwaites Beck, watercourses Bulmer Beck, Spital Beck, Standing Beck • Dalby Bush Beck • Ings Beck Designations • Dalby Bush Fen SSSI • HHAONB Priority rank 38 INNS recorded INNS treated • New Zealand pigmyweed – 2017 • Himalayan balsam – 2017

Description Recommendations Himalayan balsam has been treated by the HHAONB Work with HHAONB to address the in the top of the catchment at Fairy Dell SINC. New Himalayan balsam at Fairy Dell SINC. Zealand pigmyweed was treated in High Stittenham Survey main watercourseas part of Doing in 2017. Giant hogweed has been recorded on More for the Derwent. Braisthwaites Beck close to the confluence with the Treat known infection Y River Derwent, but this may be due to backflow from the river. Survey known infection New survey Y

INNS Report and Control Strategy

Middle Derwent Cram Beck

EA ID GB104027063570 Centroid NGR SE 72259 69824 Area 2,480 ha Major watercourses • Cram Beck, Mill Hills Beck Designations • Mount Pleasant Quarry SSSI • HHAONB Priority rank 37 INNS recorded- Year • Himalayan balsam – 2020 INNS treated • Himalayan balsam – 2020

Description Recommendations Cram Beck emerges from the hills of the HHAONB. Continue to treat Himalayan balsam Lowland mixed agriculture, largely arable with (HHAONB). native woodland and a large amount of conifer Survey to verify/determine the plantation. The catchment has no watercourses source/extent of the Himalayan balsam above. as part of Doing More for the Derwent. Himalayan balsam has been recorded in plantations Treat known infection Y both on and near Cram Beck. Isolated cases of Giant Survey known infection Y hogweed has been recorded and treated on Cram Beck close to the River Derwent by Huttons Ambo New survey Parish Council, who are monitoring the infection. HHAONB carry out Himalayan balsam treatment

within the AONB designation.

INNS Report and Control Strategy

Middle Derwent River Derwent from River Rye to Kirkham

EA ID GB104027068313 Centroid NGR SE 79411 69749 Area 5,707 ha Major • River Derwent watercourses • Gilder Beck, Howl Beck, Mill Beck Designations • River Derwent SSSI/SAC • Jeffry Bog SSSI • Beck Dale Meadow SSSI • Kirkham Park & Riverside SSSI • HHAONB Priority rank 49 INNS recorded- • Japanese knotweed- 2019 Year • Giant hogweed – 2020 • Himalayan balsam – 2020 INNS treated • Japanese knotweed – 2018 • Giant hogweed – 2020 • Himalayan balsam – 2020

Description Recommendations Himalayan balsam is recorded as being widespread Survey extent of Himalayan balsam and prolific especially around the Huttons Ambo and Japanese knotweed on the River area but this is due to an active local group Derwent. surveying and pulling. Continue treatment of the giant Giant hogweed is present along the River Derwent hogweed on the River Derwent and mostly south of the Menethorpe Beck (likely where treat Japanese knotweed in Malton. the infection originated) catchment although a Complete recommendations as part record exists higher north in Malton. of Doing More for the Derwent. Japanese knotweed has been treated in Malton Treat known infection Y centre by Network Rail in previous years. Himalayan Survey known infection Y balsam was most recently treated by HHAONB in 2020. New survey

INNS Report and Control Strategy

Middle Derwent Settrington Beck

EA ID GB104027067750 Centroid NGR SE 84808 68541 Area 3,236 ha Major • Settrington Beck, watercourses Whitestone Beck Designations • Cow Cliff Pasture & Quarry SSSI • Nine Spring Dale SSSI • Wharram Quarry SSSI Priority rank 35 INNS recorded 0 INNS treated

Description Recommendations No INNS were recorded on Settrington Beck during Re-survey in 2022. 2019 surveying. Treat known infection Survey known infection New survey

INNS Report and Control Strategy

Middle Derwent Menethorpe Beck

EA ID GB104027063550 Centroid NGR SE 80801 65828 Area 3,280 ha Major watercourses • Menethorpe Beck, Langton Beck, Mill Beck, Rowmire Beck, Thornthorpe Beck Designations • Three Dykes SSSI Priority rank 36 INNS recorded - Year • Giant hogweed – 2020 • Japanese knotweed- 2020 INNS treated • Giant hogweed – 2020 • Japanese knotweed – 2020

Description Recommendations Giant hogweed has been recorded and treated along Continue treatment of giant hogweed the western part of the main watercourse. A small and Japanese knotweed on Menethorpe patch of Japanese knotweed was recorded and Beck as part of Doing More for the treated during Giant hogweed treatment. It is likely Derwent. Himalayan balsam in present and under recorded. Treat known infection Y Survey known infection New survey

INNS Report and Control Strategy

Middle Derwent River Derwent from Kirkham to Elvington Beck

EA ID GB104027068312 Centroid NGR SE 72891 57454 Area 10,089 ha Major • River Derwent watercourses • Evers Beck, Ings Beck, Pastures Beck, Swallowpits Beck • Leppington Beck, Acklam Beck • Ran Beck • Whitecarr Beck, Moor Beck, Leavening Beck • Elvington Beck Designations • River Derwent SSSI/SAC • Kirkham Park & Riverside SSSI • Newton Mask SSSI • Mount Pleasant Quarry SSSI • Lower Derwent Valley SAC/SPA/NNR • HHAONB Priority rank 50 INNS • Rhododendron – 2016 recorded- • Giant hogweed – 2020 Year • Himalayan balsam – 2020 • Japanese knotweed- 2018 INNS treated • Giant hogweed – 2020 • Himalayan balsam – 2020 • Japanese Knotweed – 2018

Description Recommendations There is a significant Giant hogweed problem on the Survey to verify/determine the River Derwent, especially around Stamford Bridge, source/extent of the Giant hogweed on which has likely spread from upstream and Ran Beck. Survey the main watercourses. Whitecarr Beck. Treat the giant hogweed on the River There is also Himalayan balsam on most Derwent and Whitecarr Beck. watercourses which is extensive in places. Recommendations can be completed Himalayan balsam was most recently treated by with Doing More for Derwent funding. HHAONB in 2020. Treat known infection Y The Japanese knotweed that was treated in 2018 Survey known infection Y was investigated in 2020 and was not found so can confirm it has been eradicated. New survey Y

INNS Report and Control Strategy

Middle Derwent Barlam Beck / Skirpen Beck

EA ID GB104027063510 Centroid NGR SE 78952 58555 Area 2,330 ha Major watercourses • Barlam Beck, Bugthorpe Beck, Skirpen Beck • Gilder Beck Designations • River Derwent SSSI/SAC • Mount Pleasant Quarry SSSI Priority rank 39 INNS recorded – Year • Giant hogweed – 2020 • Himalayan balsam – 2018 INNS treated • Giant hogweed – 2020

Description Recommendations Giant hogweed was been recorded and is being treated Treat the Giant hogweed on Skirpen Beck on Skirpen Beck. Himalayan balsam recorded on Barlam as part of Doing More for the Derwent. Beck, close to the confluence with the River Derwent Treat known infection Y and is likely infected from the main river. Survey known infection

New survey

INNS Report and Control Strategy

Lower Derwent

Gowthorpe Beck

EA ID GB104027063490 Centroid NGR SE 77888 55665 Area 941 ha Major • Gowthorpe Beck, watercourses Fangfoss Beck Designations • Bishop Wilton Poor Land SSSI Priority rank 40 INNS recorded Himalayan balsam- 2019 INNS treated

Description Recommendations A small stand of Himalayan balsam was recorded on Treat Himalayan balsam on Awnhams Awnhams Beck in the 2019 survey. Beck as part of Doing More for the Derwent. Treat known infection Y Survey known infection New survey

INNS Report and Control Strategy

Lower Derwent Bishop Wilton Beck

EA ID GB104027063470 Centroid NGR SE 79613 53943 Area 1,656 ha Major watercourses • Bishop Wilton Beck, Ings Beck Designations Priority rank 40 INNS recorded – year • Himalayan balsam – 2019 INNS treated

Description Recommendations Old data Himalayan balsam indicates a small Treat small patch of Himalayan balsam on infection away from the catchment’s main Awnhams Beck as part of the Doing More watercourse. Survey of the main watercourse was for the Derwent Project. carried out in 2019, and no INNS were recorded Treat known infection Y apart from a small stand of Himalayan balsam on Survey known infection Awnhams Beck. New survey

INNS Report and Control Strategy

Lower Derwent Pocklington Beck from source to Bielby Beck

EA ID GB104027063480 Centroid NGR SE 83065 53178 Area 3,055 ha Major • Pocklington Beck watercourses • Millington Beck • Ridings Beck, Whitekeld Beck Designations • Beckhead Plantation SSSI • Bishop Wilton Deep Dale SSSI • Millington Wood and Pastures SSSI • Millington Wood LNR Priority rank 41 INNS recorded None INNS treated

Description Recommendations No INNS were recorded in the 2019 survey. Re-survey in 2022. Treat known infection Survey known infection New survey

INNS Report and Control Strategy

Lower Derwent Blackfoss Beck

EA ID GB104027063460 Centroid NGR SE 74165 51092 Area 2,502 ha Major watercourses • Blackfoss Beck • Common Beck • Foss Beck, Spittal Beck Designations • Melbourne and Thornton Ings SSSI • Lower Derwent Valley SAC/SPA/NNR Priority rank 45 INNS recorded – year • Himalayan balsam – 2009 INNS treated

Description Recommendations Common drain has no watercourses above and it is Survey Common Beck to verify/determine near to here that Himalayan balsam was recorded in the source/extent of the Himalayan a plantation. balsam. Survey the main watercourse. Treat Himalayan balsam at Black plantation. Recommendations can be completed with Doing More for Derwent funding.

Treat known infection Survey known infection Y New survey

INNS Report and Control Strategy

Lower Derwent Pocklington Beck from Bielby Beck to River Derwent

EA ID GB104027063440 Centroid NGR SE 75769 46826 Area 6,377 ha Major • Pocklington Beck watercourses • Black Dyke • Pocklington Canal • Sails Beck Designations • Allerthorpe Common SSSI • Melbourne and Thornton Ings SSSI • Pocklington Canal SSSI • White Carr Meadow SSSI • Lower Derwent Valley SAC/SPA/NNR Priority rank 48 INNS • Monkey flower – 2019 recorded- • Orange balsam – 2020 Year • Himalayan balsam – 2020 INNS treated • Orange balsam – 2020 • Himalayan balsam – 2020

Description Recommendations Himalayan balsam has been recorded on the River Survey to verify/determine the Derwent and Pocklington. Monkey flower was source/extent of the known infections. investigated in 2019 and found to be present at Survey Pocklington beck and treat Barmby Moor. Orange and Himalayan balsam are Monkey flower in Barmby Moor as part treated annually on Wheldrake Ings NNR by YWT of Doing More for the Derwent. staff. Treat Orange balsam to control spread of species (YWT). Treat known infection Y Survey known infection Y New survey Y

INNS Report and Control Strategy

Lower Derwent Bielby Beck

EA ID GB104027063450 Centroid NGR SE 85575 49976 Area 5,615 ha Major watercourses • Hayton Beck, Burnby Beck, Nunburnholme Beck Designations • Keasey Dale SSSI Priority rank 41 INNS recorded- Year • Giant hogweed – 2012 • Himalayan balsam – 2019 INNS treated

Description Recommendations Both Himalayan balsam and giant hogweed have been Treat Himalayan balsam in Hayton as part recorded in small amounts, on or near the catchments of Doing More for the Derwent. main watercourse although Himalayan balsam is likely Treat known infection Y to be under recorded. Survey known infection Giant hogweed was investigated in 2019 from a New survey sighting and was not found.

INNS Report and Control Strategy

Lower Derwent River Derwent from Elvington Beck to River Ouse

EA ID GB104027068311 Centroid NGR SE 69554 38060 Area 6,429 ha Major watercourses • River Derwent Designations • River Derwent SSSI/SAC • Derwent Ings SSSI • Breighton Meadows SSSI • Lower Derwent Valley SAC/SPA/NNR • Skipwith Common NNR Priority rank 51 INNS recorded – Year • Orange balsam – 2020 • Himalayan balsam – 2018 INNS treated • Himalayan balsam – 2020

Description Recommendations Himalayan balsam has been recorded in several Work with Natural England, landowners, places and is predicted to be present along all the and volunteers to treat the Himalayan River Derwent and much of the becks and drains balsam and Orange balsam in the within the catchment. designated sites in the LDV. Orange balsam was treated by YWT staff at Treat known infection Y Wheldrake Ings. Survey known infection Himalayan balsam was treated by Natural England New survey as part of management of the Lower Derwent Valley NNR.

INNS Report and Control Strategy

Lower Derwent Fleet Dike

EA ID GB104027063630 Centroid NGR SE 72553 33429 Area 1,301 ha Major watercourses • Fleet Dike Designations • Breighton Meadows SSSI • Lower Derwent Valley SAC/SPA/NNR Priority rank 44 INNS recorded – year • Himalayan balsam – 2019 INNS treated

Description Recommendations Large stands of Himalayan balsam were recorded Treat Himalayan balsam once infection close to the catchment watercourse’s confluence upstream of main river has been with the River Derwent in 2019. This section is likely controlled. to be infected from the main body of the River Derwent and therefore upstream needs to be Treat known infection tackled before treatment can be carried out here. Survey known infection New survey

INNS Report and Control Strategy

Lower Derwent Lowmoor Drain

EA ID GB104027063420 Centroid NGR SE 66662 34303 Area 2,397 ha Major • Lowmoor Drain watercourses • Dyon Drain, Folly Drain Designations • Skipwith Common SSSI/SAC Priority rank 44 INNS recorded- • Himalayan balsam – 2019 Year INNS treated

Description Recommendations Large amounts of Himalayan balsam have been Work with landowners and LDV NNR to recorded on Dyon Drain and away from the main treat Himalayan balsam. watercourses. Treat known infection Y Survey known infection New survey

INNS Report and Control Strategy

Lower Derwent Fleet Dike

Description Recommendations Large stands of Himalayan balsam was recorded Treat Himalayan balsam once infection close to the catchment watercourse’s confluence upstream of main river has been with the River Derwent in 2019. This section is likely controlled. to be infected from the main body of the River Derwent and therefore upstream needs to be Treat known infection tackled before treatment can be carried out here. Survey known infection New survey

INNS Report and Control Strategy

8 Treatment Methods As well as the priorities outlined in section 3 of this document the following should be considered when planning treatment works:

• Treating at the correct time of year (Appendix 1) and thoroughly enough to prevent the seed bank being replenished. • Targeting places where spread from the site is likely, i.e., watercourses, places with regular public access; footpaths, car parks, laybys. • Provision must be made to ensure relevant health and safety protocols are adhered to. This includes risk assessments, biosecurity measures, Personal Protective Equipment (PPE) is used where needed and all practitioners/contractors are suitably qualified.

Most seed will not survive for more than three years so a thorough treatment plan of this length should usually be sufficient. This cannot though be assured so assessment when treatment is carried out is needed and follow up surveys should be undertaken the year after any treatment program.

Other options to those listed below include biological control, such as weevils, which can be especially effective for aquatic plants where chemical treatment is difficult and/or can pose a threat to the wider ecology of the site. Pathogenic control is also an option that is being explored specifically for Himalayan balsam. Rust fungus is currently being trialled in parts of the UK which, thus far, has specifically targeted Himalayan balsam without infecting native species. Whilst this won’t eradicate a species it could limit its vigour and subsequent prevalence, enough to prevent it becoming too dominant and allow it to coexist with native species without its presence being detrimental. 8.1 Giant hogweed Heracleum mantegazzianum Due to the toxicity of Giant hogweed, it is very difficult to handle and therefore it isn’t generally removed from treated areas. Large stands should be chemically sprayed whilst smaller stands can be stem injected where this is more efficient logistically. The plant will usually die within 2 weeks of treatment. It is advised to carry out treatment at least twice in a season where there are large stands of giant hogweed. Treatment: April- August 8.2 Japanese knotweed Fallopia japonica Japanese knotweed is generally treated chemically, and this can be either by spraying or stem injecting depending on what is most appropriate to the site. Special care must be paid if material is removed from the treatment site which may well be the case in urban settings. Small fragments of organic material, not necessarily roots, can regrow into plants. Treatment: August- October 8.3 American skunk-cabbage Lysichiton americanus American skunk-cabbage is generally treated using pesticide through stem injection or spraying. It can be removed manually by digging out the plant and disposing of, but care is needed when doing this as rhizomes fragments can form new plants if not all plant matter is removed. 8.4 New Zealand pigmyweed Crassula helmsii New Zealand pigmyweed is generally treated chemically. Being an aquatic plant, this needs to be done with special care to the ecology of the environment where it’s present. Biosecurity is also a concern as it can regrow from small amounts of organic material.

INNS Report and Control Strategy

8.5 Himalayan balsam Impatiens glandulifera Himalayan balsam can be treated by either pulling manually, brush cutting, mowing (including tractor mounted) or chemically treating. Chemical treatment is also more expensive due to the expertise/resources required and has the potential to lead to damage to the wider ecology of a site. Pulling is the most effective method as this will exclude any chance of the plant re-growing which can happen when cut. Due to the vigorous nature of Himalayan balsam, it is necessary to either remove it from site after pulling or ensure it roots are not left in contact with the soil (usually by hanging on fences or branches) as it has the capacity to regrow. Treatment: May- July. 8.6 Rhododendron Where Rhododendron is well established and/or mature its removal is generally done by felling the plants and then chemically treating the remaining stumps. Smaller plants/saplings can be pulled by hand. This work can be laborious and expensive. 8.7 Monkey flower Mimulus guttatus There is currently no official method for treating Monkey flower, with NNSS unable to suggest an appropriate treatment method. Spraying with glyphosate may be the likely option but this will need to be researched further. 8.8 Orange balsam Impatiens capensis Orange balsam is most effectively treated by pulling manually. As it does not grow in large stands like I.glandulifera, and is often found mixed in between native flora including reed and reed sweet grass, brush cutting would not be a suitable method. Novel trials of using chemical spray in reed beds have been successful, so may be an option when treating in areas without broad-leaved plants. Treatment: July- September.

INNS Report and Control Strategy

Appendices Appendix 1: Data collection Data on INNS for the Derwent catchment is digitalised and is available on the YISF website; INNS Mapper. Although most data can be found on INNS Mapper, YDCP also has INNS data on QGIS that has been collated from archive data and data from other organisations. Data can now only be inputted directly onto INNS mapper. This has several advantages including allowing for immediate centralisation of data and avoiding collation of records collected in other formats and ultimately reducing staff costs processing the data. It also allows participants access to data beyond that which they have collected themselves, creating a sense of involvement for contributors in the wider work being undertaken and how they fit in to it.

Below are some of the principles used to standardise data collection and allow it to be used more easily for future planning:

• Data should be recorded as a British National Grid Reference (NGR) or where collected using Global Positioning System (GPS) equipment it should be in ‘EPSG:27700, OSGB 1936 British National Grid’ projection. This will allow for compatibility with existing data sets and Ordnance Survey maps. • Dates should always accompany records taken but these need only be to the year for surveying. When taken for treatment they should be specific as treatments timing is dependent on the life cycle of the plants and their period of seed production. • GIS data is recorded as either points or lines and both can be employed depending on the extent of the infestation. It is recommended that where an infection covers a length of watercourse for less than 10m it is recorded as a central point. Above 10m the data should be recorded as a line between two points. The reason for this is to speed up the data collection and to give maps produced at a larger scale more clarity. • Recording of the extent of an infection both in terms of the area covered or approximate number of plants will allow for more accurate planning of future treatment works. • Generally, only positive sightings of INNS have been recorded in the Derwent catchment. This does not however indicate which areas are free of INNS and which have had no data collected, either positive or negative. Consequently, formal surveying should include a record of the start and finish point of any surveys undertaken. The survey can then be recorded in GIS as a line. This does not preclude data being collected in a less formal manner. • Following the protocols of YISF, surveys should be repeated every three years where a negative survey is returned to check for any new infections. In places where a treatment programme has taken place it is advisable to survey the following year to check on its effectiveness.

INNS Report and Control Strategy

Appendix 2: INNS Calendar

INNS Report and Control Strategy

Appendix 3: Survey Record Sheet

Date: Recorder: Comments/Additional info: River Waterbody: Start location: End Location: Start time: End time:

Species Bank (left or Length of Amount Grid ref (e.g. Images Map Comments right facing watercourse (m2) SE 04017 12080) (ref) ref downstream) (m)

INNS Report and Control Strategy

Appendix 4: Treatment Record Sheet

Name Reference

Date Species Start Mid point NGR End Quantity (m2 or no. of Treatment Comments (i.e. L/R bank where (if the infection is less than plants - <10, <100, <1000 relevant, further treatments needed? (NGR) NGR point 10m in length) point etc) undertaken etc) (pulling/spraying/ stem injecting etc)