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Insects for Biological Control of Broom (Cytisus Scoparius) in New Zealand

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Insects for Biological Control of Broom (Cytisus Scoparius) in New Zealand Eleventh Australian Weeds Conference Proceedings INSECTS FOR BIOLOGICAL CONTROL OF BROOM (CYTISUS SCOPARIUS) IN NEW ZEALAND P. Syrett Manaaki Whenua Landcare Research, PO Box 69, Lincoln, New Zealand Summary A program to introduce insects for biological insects that are restricted to broom and its close relatives. control of broom (Cytisus scoparius) in New Zealand be- Thus prospects for identifying potential control agents gan in 1981. The twig mining moth Leucoptera are good. spartifoliella was already well established: its means and A biological control program for broom in New Zea- time of arrival in New Zealand from its native Europe are land was initiated in 1981 by the Department of Scien- unknown. This moth has a substantial impact on broom tific and Industrial Research (DSIR), and is currently but the weed is still a serious problem in pastures, plan- continuing under Manaaki Whenua Landcare Research. tation forests, river beds, and some conservation areas. Work is being carried out in collaboration with the Inter- Broom is still invading new areas in New Zealand. national Institute of Biological Control (IIBC) in the Broom seed beetle, Bruchidius villosus, was first re- United Kingdom. We co-operate with CSIRO and the leased in 1987, and the broom psyllid, Arytainilla NSW Department of Agriculture who are now working spartiophila, in 1993. Both have established. Tests of on a parallel program on biological control of broom in host specificity are almost completed for the leaf-feeding collaboration with IIBC. International collaboration has beetle Gonioctena olivacea, the foliage-feeding caterpil- increased further through the renewed interest in broom lars Agonopterix assimilella and Chesias legatella, and in the United States. Participants from Europe, New Zea- the root-feeding weevil, Sitona regensteinensis. land, and Australia, as well as from North America, at- tended a Broom Symposium in Portland, Oregon in April INTRODUCTION 1996. Broom (Cytisus scoparius (L.) Link) was first recorded Our goals have been to identify and introduce host- in New Zealand in 1872 (Webb et al. 1988) and occurs specific insects to reduce the rate of growth and repro- predominantly on the eastern sides of both islands, from duction of broom, to reduce its competitive ability, and to Northland to Southland. It occupies open habitats, both slow its rate of invasion. Ultimately, achievement of on productive and conservation lands, and although wide- these goals will reduce the problem status of broom and spread and abundant, continues to invade new areas. the costs of its control by conventional methods. The Broom is found from sea level to 1200 m (Stevens and studies on potential biological control agents, prepara- Hughes 1973). Establishment costs of exotic pine forests tion of Importation Impact Assessments (IIAs), and are increased by the need to clear broom from plantation evaluation studies are being funded by the Foundation sites, and re-invasion by the weed reduces the rate of tree for Research, Science, and Technology (FRST), while growth (Balneaves personal communication). Broom is a Regional Councils, the Department of Conservation, serious invader of pastoral land, particularly in the drier Landcorp, and farmer groups have contributed towards hill country areas, where substantial losses to agricultural rearing, release, and establishment of control agents. production may result (Bascand and Jowett 1982). Habi- tat of nesting native birds on open river beds is threat- EXISTING INSECT FAUNA ened when broom and other scrub weeds invade and pro- At the beginning of the biological control program a sur- vide cover for predatory species (Hughey 1985). In some vey of insects occurring on broom throughout New Zea- situations broom can be contained by grazing manage- land was conducted (Syrett 1993). Species diversity and ment, and where further control is necessary, herbicides, the overall numbers of insects recorded were low com- although expensive, are effective (Balneaves 1982). Cut- pared with the fauna of broom in Europe. However, one ting and burning have also been recommended in certain specialized broom-feeding insect, the twig mining moth situations (Anon. 1981). Leucoptera spartifoliella Hübner (Lepidoptera: Broom is a suitable target for biological control be- Elachistidae), was common and widespread throughout cause of the high costs of alternative control measures New Zealand (Syrett and Harman 1995). It is not known (relative to the economic returns from much of the mar- how it became established here, but the first specimen ginal lands on which broom grows) and its widespread collected is dated 1950. This moth frequently occurs at distribution in New Zealand. Broom has a large fauna in damaging population levels, an event that is rare in its its native Europe and a high proportion of specialized native Europe. It is thought that the difference may be 525 Eleventh Australian Weeds Conference Proceedings caused by the presence in Europe of parasitoids, in par- beetle will stabilize. Even if it is not high enough to re- ticular the moths most common larval parasitoid, duce the seed bank under existing broom stands suffi- Tetrastichus evonymellae (Bouché) (Hymenoptera: ciently to affect their replacement, it may slow the rate of Eulophidae). No parasitoids have been found attacking spread of broom into new areas (Hosking 1995). L. spartifoliella in New Zealand (Scheele and Syrett Of the two species of psyllid feeding on broom in the 1987). Studies are in progress to quantify its impact. United Kingdom, Arytainilla spartiophila and Arytaina Several generalist insects occasionally damage genistae Latreille, A. spartiophila was chosen for intro- broom in New Zealand. Caterpillars of both native and duction because of its narrower host range, and observed introduced tortricid moths web together young twigs and damage to broom in Europe. Its eggs are laid in green feed externally on broom foliage causing significant dam- stems in summer, and overwinter in this stage. Larvae age. The cerambycid Oemona hirta (F.) can cause sub- emerge early in spring, to develop into a new generation stantial damage to thicker stems, causing death of large of adult psyllids. Populations can reach high levels, caus- branches. It has a broad host range including many eco- ing severe damage to broom bushes. Host specificity tests nomically important species (Penman 1984). A stem-bor- for the broom psyllid were completed in 1990 and an IIA ing caterpillar, Anisoplaca ptyoptera Meyrick (Lepidop- was prepared. The broom psyllid has been released at 20 tera: Gelichiidae), is sometimes found girdling stems of sites throughout New Zealand. Establishment has been broom, and can cause the death of large branches, or even confirmed at one site near Lincoln, but for most of the whole bushes. However, it is found more commonly on releases (five made in 1994, and 14 in 1995), it is too gorse (Ulex europaeus), and is thought to have trans- soon to confirm establishment. Further releases of both ferred to the two exotic hosts from native Carmichaelia these insects throughout New Zealand are planned under species (Holder 1990). a co-operative program with Regional Councils, the De- partment of Conservation, Landcorp, forestry companies, INSECT INTRODUCTIONS and a farmer group. Two insect species have been introduced into New Zea- land as biological control agents for broom, the seed- PROSPECTS FOR FURTHER INTRODUCTIONS feeding beetle, Bruchidius villosus (F.) in 1987, and the The fauna of broom in the United Kingdom has been well psyllid, Arytainilla spartiophila (Forster) in 1993 studied and includes a number of specialized insects (Harman et al. in press). A stem-mining weevil, feeding on the plant (Waloff 1968). Host testing is al- Perapion immune Kirby, was identified as having excel- most complete for a broom leaf beetle, Gonioctena lent potential as a biological control agent because it olivacea (Forster), that is numerous and widespread in caused substantial structural damage to plants by mining Europe and particularly damaging to seedling plants. stems, which then broke at the nodes. It is multivoltine, Results of host specificity tests indicate that there may be so has the potential to reach high population levels. Host some risk of damage to tree lucerne, Chamaecytisus specificity tests were completed but the weevil has not palmensis (Christ) Bisby et K. Nicholls (Wapshere and been released because it has the potential to damage an Hosking 1993), and this issue will be addressed in the important native legume, Sophora microphylla Aiton IIA to be prepared shortly. Testing for host specificity of (Syrett et al. 1995). a weevil that feeds on root nodules of broom, Sitona Adults of B. villosus are pollen feeders, but their lar- regensteinensis Herbst and two foliage-feeding caterpil- vae feed and develop inside individual broom seeds, de- lars, Chesias legatella (Denis & Schiffermüller) and stroying them. Host specificity tests showed that devel- Agonopterix assimilella (Treitschke), should be com- opment of B. villosus was restricted to Cytisus species, pleted by June 1997. Most tests with these species have and possibly to C. scoparius, and that it posed no threat been carried out for New Zealand by the IIBC at Silwood to non-target species (Syrett and ODonnell 1987). Re- Park in southern England. leases of 1000 beetles have been made at each of 48 sites There are a substantial number of further species throughout New Zealand. Beetles have established at six with potential for biological control, including some that of 10 of the sites where releases were made in 199293 either occur in south-west Europe but not in the United or earlier. At a site in Lincoln, Canterbury, where beetles Kingdom, or are more common further south. South-west were first released in 1991, the rate of infestation of seeds Europe is the centre of origin of Cytisus spp., so the great- by beetles rose from 5% three years after release to 20% est diversity of insect species on broom occurs here re- four years after release.
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