Pest Risk Assessment: Drosophila suzukii: spotted wing drosophila (Diptera: Drosophilidae) on fresh fruit from the USA FINAL MPI Technical Paper No: 2012/05 ISBN: 978-0-478-38861-9 (online) ISSN: 2253-3923 (online) June 2012 Contributors to this risk analysis 1. Primary author Jocelyn A. Berry Senior Adviser Ministry of Primary Biosecurity Risk Analysis Industries, Wellington, New Zealand 2. Internal Review Deb Anthony Biosecurity Risk Analysis Ministry of Primary Melanie Newfield Group Industries, Wellington, Michael Ormsby New Zealand 3. External peer review Dr John W. Armstrong Quarantine Scientific Ltd., New Zealand Cover photo Spotted wing drosophila, Drosophila suzukii, adult ♂ Photo credit: Dr G. Arakelian, Los Angeles County Agricultural Commissioner/Weights & Measures Department Requests for further copies should be directed to: Publications Logistics Officer Ministry for Primary Industries PO Box 2526 WELLINGTON 6140 Email: brand@mpi.govt.nz Telephone: 0800 00 83 33 Facsimile: 04-894 0300 This publication is also available on the Ministry for Primary Industries website at http://www.mpi.govt.nz/news-resources/publications.aspx © Crown Copyright - Ministry for Primary Industries Contents Page 1.1 Summary.…………………………………………………………………………………………………...... ..1 1.2 Purpose……………………………………………………………………………………………………….. ..1 1.3 Background …………………………………………………………………………………………….......... ..1 1.4 Scope …………………………………………………………………………………………………………. ..2 1.5 Hazard Identification ………………………………………………………………………………………… ..2 Description ............................................................................................................................................2 Taxonomy .............................................................................................................................................2 New Zealand status ...............................................................................................................................2 Status in the USA ..................................................................................................................................2 General geographic distribution .............................................................................................................3 Plant associations .................................................................................................................................4 Commodity association .........................................................................................................................5 Potential for establishment and impact ..................................................................................................6 Hazard identification conclusion ............................................................................................................6 1.6 Risk Assessment………………….…………………………………………………………………………. ..7 Biology ..................................................................................................................................................7 Description and identification ............................................................................................................7 Vector status of Drosophila suzukii ...................................................................................................7 Interceptions .....................................................................................................................................7 Biology/phenology .............................................................................................................................7 Overwintering ...............................................................................................................................9 Spring and summer .................................................................................................................... 10 Humidity ...................................................................................................................................... 11 Natural enemies .............................................................................................................................. 12 Laboratory data on thermal tolerance ............................................................................................. 12 Cold tolerance ............................................................................................................................ 12 Heat tolerance ............................................................................................................................ 13 Monitoring ........................................................................................................................................... 13 Pathway descriptions .......................................................................................................................... 15 Apricots (Prunus armeniaca) ........................................................................................................... 15 Blueberries (Vaccinium spp.) .......................................................................................................... 16 Cherry (Prunus avium) .................................................................................................................... 16 Grapes (Vitis vinifera and hybrids) .................................................................................................. 17 Peaches (Prunus persica) ............................................................................................................... 19 Nectarines (Prunus persica var. nucipersica) .................................................................................. 19 Plums (Prunus domestica and hybrids)........................................................................................... 20 Strawberries (Fragaria ananassa) ................................................................................................... 20 Entry assessment ................................................................................................................................ 21 Exposure assessment ......................................................................................................................... 23 Establishment assessment .................................................................................................................. 24 Consequence assessment .................................................................................................................. 25 Economic consequences ................................................................................................................ 25 Environmental consequences ......................................................................................................... 27 Socio-cultural consequences .......................................................................................................... 27 Human health consequences .......................................................................................................... 28 1.7 Risk estimation ………………………………………………………………………………………………..28 1.8 References …………………………………………………………………………………………………….28 Appendix 1: Hosts of Drosophila suzukii………………………………………………………………………….. 38 Appendix 2: Summary of approved commodities – United States of America ……………………………….. 42 i 1.1 SUMMARY Drosophila suzukii (Matsumura), or spotted wing drosophila, is a temperate to subtropical species of vinegar or pomace fly native to Southeast Asia. It is an emerging invasive pest that is currently undergoing a rapid range expansion in North America and Europe. Although most other vinegar flies are attracted primarily to damaged, rotting or fermented fruit, D. suzukii is able to attack the fresh, ripe fruit of some hosts by laying eggs under the soft skin. The larvae hatch and grow in the fruit, destroying its commercial value. The host range of this fly is reportedly wide, including both cultivated and wild hosts. Cultivated hosts include many tree, bramble and vine fruits. This assessment examines the risk posed by D. suzukii on approved commercial shipments of its known hosts from the USA: stone fruit (apricots, nectarines, peaches, plums, pluots), cherries, strawberries, table grapes. The risk posed by importing US blueberries is also assessed. The likelihood of entry is commodity-dependent and is assessed specifically for each pathway. Evidence from the fly‟s native and introduced ranges suggests that this likelihood is low to moderate for apricots and high for all other commodities assessed. The likelihoods of exposure and establishment are largely independent of the commodity association1. The likelihood of exposure is considered to be moderate for immature stages crossing the New Zealand border and high for adult stages. The likelihood of establishment and spread is considered to be high throughout crop- producing areas of New Zealand, based on the fly‟s biology, phenology and current global distribution. The economic consequences of establishment are likely to be moderate to high and the environmental and socio-cultural consequences are likely to be low. Effects on human health are unlikely. 1.2 PURPOSE The purpose of this report is to assess the risks associated with Drosophila suzukii entering New Zealand via fresh produce imports from the United States of America. The affected pathways include the existing trade in apricots, cherries, peaches, plums (and their interspecific hybrids, such as pluots and
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