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Predicting the Biocontrol Potential of the Parasitoid Wasp Enoggera Nassaui on the Eucalyptus Leaf Beetle Paropsisterna Selmani

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Predicting the Biocontrol Potential of the Parasitoid Wasp Enoggera Nassaui on the Eucalyptus Leaf Beetle Paropsisterna Selmani Technology Updates Crops, Environment and Land Use Project number: 6356 Date: Nov, 2018 Funding source: Teagasc Project dates: Jan 2013 – Jul 2018 Predicting the biocontrol potential of the parasitoid wasp Enoggera nassaui on the Eucalyptus leaf beetle Paropsisterna selmani Key external stakeholders: Horticulture industry Coillte DAFM (Forest Service) NPWS Practical implications for stakeholders: . Monitoring of field sites recorded a rate of population expansion and associated damage levels that demonstrate the serious risk that the leaf beetle P. selmani presents to the Irish Eucalyptus industry. In laboratory conditions, the parasitoid wasp E. nassaui developed on the eggs of the leaf beetle across temperatures from 11°C to 23°C. Developmental rates in relation to temperature suggest that the Irish climate is suitable for the establishment of the parasitoid in field conditions. The parasitoid wasp demonstrated high host specificity. It showed minimal interest in a range of 22 alternative non-target native species, and failed to reproduce on any of them. Main results: Monitoring of field sites recorded a rate of population expansion and associated damage levels that demonstrate the serious risk that the leaf beetle Paropsisterna selmani presents to the Eucalyptus industry in Ireland. Our research represents the first time that a leaf beetle has been targeted with a biological control agent in Europe. In laboratory conditions, we demonstrated that the immature stages of the parasitoid wasp Enoggera nassaui can develop on the eggs of the leaf beetle across temperatures from 11°C to 23°C. Predictive modelling suggests the viability of the wasp as a biocontrol agent from May to September in Ireland, the most likely period of host availability. The parasitoid wasp was presented with a range of 22 non- target beetle species. The parasitoid wasp showed minimal interest in them, and failed to reproduce on any of these species. Opportunity / Benefit: Eucalyptus is the most important foliage crop in Ireland. The leaf beetle P. selmani is an alien invasive species and was discovered damaging Eucalyptus plants in a mixed species cut-foliage plantation in Kerry, south west Ireland in 2007. It has the potential to greatly reduce the economic value of cut foliage from Eucalyptus trees. It is spreading in Ireland, and will require management. We demonstrate the potential of the parasitoid wasp E. nassaui to control the leaf beetle and contribute to integrated pest management. Collaborating Institutions: University College Dublin Teagasc project team: Dr Dorothy Hayden Dr John Finn Mr Andrew Whelton External collaborators: Dr Jan-Robert Baars, UCD 1 Contact John Finn Email: [email protected]. http://www.teagasc.ie/publications/ Technology Updates Crops, Environment and Land Use 1. Project background: The accidental introduction of the Eucalyptus leaf beetle pest P. selmani into Ireland, poses a significant threat to our commercial foliage, biomass and forestry industries. This is the first paropsine leaf beetle to become established in Europe and it was initially discovered damaging foliage crops in Kerry in 2007. It is now commonly found in many areas of the south west, south and east coast. Predictions of the patterns of spread suggest that it is only a matter of time before it is established throughout the island and this poses a bio-security risk to mainland Europe. The colourful leaf beetle defoliates Eucalyptus trees and even small amounts of damage renders Eucalyptus foliage crops unmarketable. The research will provide necessary information toward fulfilling the requirements of a risk assessment required if a field release application is to be considered. The benefits of establishing a natural control agent for the beetle under field conditions include: • retention of valuable market share and profitability for foliage growers • resumption of biological control of the psyllid pest Ctenarytaina eucalypti, where insecticides had been used to target the leaf beetle pest • positive environmental benefits, and; • reduced likelihood of the beetle spreading to neighbouring countries. 2. Questions addressed by the project: Our research investigated the ecology of the candidate biological control agent E. nassaui. What is the damage potential of the leaf beetle in monitored Irish Eucalyptus foliage and forestry plantations with a known occurrence of the leaf beetle? Under quarantine laboratory conditions, what is the effect of temperature on the relationship (e.g. development time and success) between the parasitoid and host leaf beetle? Under quarantine laboratory conditions, does the parasitoid wasp attack non-target Irish insects? 3. The experimental studies: A parasitic wasp, E. nassaui has been used as a biocontrol agent of similar leaf beetles in New Zealand and was imported into a quarantine insectary in University College Dublin (sponsored by Coillte) for further study. Emerging females parasitized eggs of the available host P. selmani, on which the colony was routinely maintained. Fig. 1. The parasitoid wasp Enoggera nassaui in the act of parasitizing an egg of the Eucalyptus leaf beetle pest Paropsisterna selmani (left) and eggs parasitized by the wasp (right). Colonies of E. nassaui were reared at constant temperatures of 10.9, 15.6, 17.2 and 22.8°C. A batch of eggs of known quantity, usually 100-250 eggs were placed in a Petri-dish with a honey-impregnated strip of paper. On the first exposure date, these eggs were exposed to three day old naïve female wasps (never before exposed to host eggs) for 2 hours, and all subsequent exposures used females that were at least three days old. Eggs were monitored daily. The stage of development was determined by dissecting 2-4 eggs daily from each batch of exposed eggs, using entomological pins. Using such experiments, we measured the effect of temperature on the rate of development, larva-adult survival, wasp longevity, wasp fecundity, and sex ratios. A total of 22 non-target beetle species were collected in the wild in Ireland. These were from the beetle 2 Contact John Finn Email: [email protected]. http://www.teagasc.ie/publications/ Technology Updates Crops, Environment and Land Use subfamilies Chrysomelinae, Galercucinae, and Coccinellinae e.g. Phaedon cochliariae, Phratora vulgatissima, Galerucella nymphaeae, Anatis ocellata, Calvia quatuordecimuttata, Myrrha octodecimguttata. Individuals of E. nassaui were exposed to eggs of P. selmani and the native beetles in small arenas using a choice and no-choice tests with both positive and negative controls. 4. Main results: Development time decreased with increasing temperatures. Fecundity was highest at 17.2°C, while adults were long lived and larva-adult survivorship was high across all temperature ranges. We found that 117 degree days were required above a minimum of 8.3°C to complete development. Depending on temperatures in western Europe, between 4-25 generations could be completed theoretically from May to September each year, the likely period of host availability. Life table results predict that the wasp could sustain itself when three or more generations are produced per year. The net reproductive rate (Ro) falls below 1.0 at 10°C, indicating that a decline in population growth is expected when populations are subjected to prolonged periods of temperature below this figure. No E. nassaui wasp progeny were reared from any egg of the selected non-target beetle species. Results of the laboratory trials suggest the wasp will pose no threat to native species if considered for field release. 5. Opportunity/Benefit: Eucalyptus is the most important foliage crop in Ireland, while the forestry and biomass sectors are emerging sectors that utilizing this genus. The leaf beetle P. selmani is an alien invasive species and was discovered damaging Eucalyptus plants in a mixed species cut-foliage plantation in Kerry, south west Ireland in 2007. It has the potential to greatly reduce the economic value of cut foliage from Eucalyptus trees, and inflict sustained defoliation levels in forestry plantations once established. It is spreading in Ireland, and will require control. Our research demonstrates the potential of the parasitoid wasp E. nassaui to control the leaf beetle pest. 6. Dissemination: Main publications: Hayden, D. (2018) ‘Field investigations of the invasive leaf beetle pest Paropsisterna selmani and laboratory based evaluation of the candidate biological control agent Enoggera nassaui.’ PhD thesis, University College Dublin. Popular publications: Hayden, D., Finn, J. and Baars, J-R. (2014). ‘Beetle threat to horticultural crops in Ireland’. T Research Vol. 9, No. 2. Hayden, D., Finn, J. and Baars, J-R. (2015). ‘Biological control of the invasive leaf beetle pest, Paropsisterna selmani of Eucalyptus crops in Ireland’. Environs April 8-10, 2015, Sligo. Hayden, D., Finn, J. and Baars, J-R. (2015). ‘Biological control of an invasive leaf beetle pest of Eucalyptus foliage and forestry plantations in Ireland’. IOBC-WPRS Bulletin, 137, 32-34. Hayden, D., Finn, J. and Baars, J-R. (2015). ‘Future research needs and challenges to Integrated Pest Management of Eucalyptus crops in Ireland’. IOBC-WPRS Conference, 13-15th May 2015; Bornholm, Denmark. Hayden, D., Whelton, A., Stout, J., Finn, J. and Baars, J-R. (2013). ‘Biodiversity and integrated pest management of Eucalyptus foliage and forestry plantations’. Ireland’s Rural Environment: Research highlights from Johnstown Castle, 63-64. Hayden, D., Finn, J. and Baars, J-R. (2018). ‘Field investigations of the invasive leaf beetle pest P. selmani and laboratory based evaluation of the candidate biological control agent E. nassaui’. IOBC-WPRS Conference, 12-14th September 2018, University of the Azores, Portugal. 7. Compiled by: John Finn 3 Contact John Finn Email: [email protected]. http://www.teagasc.ie/publications/ .
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