0000123991 00000 n our common “fruit flies”). About Spotted Wing Drosophila and the SCRI SWD Project. Stings are not readily visible on raspberries, blackberries, and strawberries, so it is difficult to detect an early infestation by monitoring the fruit for damage. (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)})(window,document,'script','//www.google-analytics.com/analytics.js','ga');ga('create', 'UA-46953310-1', 'auto');ga('require', 'displayfeatures');ga('send', 'pageview'); 0000019620 00000 n Many times SWD flies are not noticed until fruit is mature, and by that time management is not very effective. 0000017631 00000 n trailer <<8732022B7153434681584327494E1D3E>]/Prev 604858/XRefStm 2521>> startxref 0 %%EOF 463 0 obj <>stream 0000131471 00000 n Small white larvae hatch from eggs within a few days and feed inside the fruit, causing it to soften and collapse around the feeding site. After maturing, the larvae partially or completely exit the fruit to pupate. Spotted wing drosophila (SWD) is a vinegar (fruit) fly that was first reported in Britain in 2012. Some cherry varieties might be more susceptible to SWD than others, but more research is required. Spotted wing Drosophila (SWD), Drosophila suzukii, is an invasive vinegar fly native to Southeast Asia. Vlach, J. Ext. It infests ripening cherries throughout the state and ripening raspberry, blackberry, blueberry, and strawberry crops, especially in coastal areas. It also has been observed occasionally attacking other soft-flesh fruit such as plums, plumcots, nectarines, and figs when conditions are right. SWD are very similar in size, shape and appearance to other vinegar flies (i.e. Spread. 0000111668 00000 n In laboratory studies at constant temperatures, they are most active at 68°F; activity becomes reduced at temperatures above 86°F. h�b```b`�x�����?�A��b�,G&�(�0�&��$`�.,�*9�����B u�R�Eߞ€�q�D4�P�x}���ޛ���f�Α T����T��. A: I think you have spotted some larvae of the spotted wing drosophila (SWD). The spotted wing drosophila (SWD) is a fruit fly that is a 1/16 to 1/8 inch long with red eyes and a yellow-brown thorax and abdomen. larvae can be relatively easy to detect. SPOTTED WING DROSOPHILA MANAGEMENT IN HOME FRUIT PLANTINGS Matthew J. Grieshop, Diane Brown, Rufus Isaacs, Julianna Wilson MICHIGAN STATE UNIVERSITY Department of Entomology Last updated June 2020 Pest background. The larvae tunnel and feed under the skin of the fruit and can reach a length of 4 mm. What makes the SWD different is that the female has an enlarged, serrated ovipositor (egg layer) that enables her to lay eggs under the skin of ripening fruits that are otherwise free of damage. However the netting must be applied before fruit begins to ripen so that flies will not be caught inside the net. Image: Matteo Maspero and Andrea Tantardini – Centro MiRT Fondazione Minoprio. 0000014490 00000 n Each sting contains 1 to 3 eggs, and a female can oviposit on many fruit. The fly lays eggs in the ripening fruit. The online version of this publication also includes a link to an SWD identification card. 0000131050 00000 n EM 9096 • October 2014. Spotted wing drosophila (SWD), Drosophila suzukii, is a fruit fly first found in 2008 damaging fruit in many California counties. cVA is a male-specific attractant, but spotted wing drosophila does not produce cVA although they may have retained the ability to detect it. A: I think you have spotted some larvae of the spotted wing drosophila (SWD). 2010. Antifungal Properties of Spotted Wing Drosophila (Drosophila suzukii) Larvae INTRODUCTION The spotted wing drosophila, Drosophila suzukii, ((Matsumura) (Diptera: Drosophilidae)) is native to Asia and since 1980 has become invasive in a number of other countries. Spotted wing drosophila (SWD), Drosophila suzukii, is an insect pest of economically valuable small fruit and tree fruit crops. Unlike other vinegar flies that occur in California, spotted wing drosophila attacks healthy ripening fruit as well as damaged or split fruit. The insecticide spinosad (e.g., Monterey Garden Insect Spray) is effective and has the least negative environmental effects of currently available products. The best way to find out if you have spotted wing drosophila in your garden is to set up some simple traps. The spotted wing drosophila will attack thin-skinned fruit such as raspberry, blackberry, blueberry, strawberry, cherry, plum, peach, nectarine, and sometimes grape. If you suspect you have a Western cherry fruit fly, take specimens to your local agricultural commissioners’ office. SWD Management There are three important components to effective SWD manage-ment: Monitoring, Identification, and Control. A second application may be needed 7 to 10 days later. B SPOTTED WING DROSOPHILA Disclaimer Spotted wing drosophila is a new insect pest in the Pacific Northwest, having arrived in California in 2008. Unlike most other vinegar flies it can damage otherwise unblemished soft and stone fruit including strawberries, raspberries, blackberries, currants, blueberries, grapes, cherries and plums. 0000009191 00000 n Spotted wing drosophila (SWD) is a fruit fly that's on the move. 0000016606 00000 n There are also a couple of possibilities for predators on the spotted wing drosophila (SWD) that are commercially available. FOR ALL OTHER USES or more information, read Legal Notices. Males are smaller than females. A combination of preventive and cultural practices, discussed below in Cultural Control, might be useful for reducing problems on fruit trees and berries. A spotted wing drosophila are able to lay its eggs in healthy fruit that is still ripening, as opposed to other vinegar flies that only attack rotting fruit. 0000003113 00000 n We expect populations to increase in the coming weeks as more food (fruit) becomes available for the flies, especially if conditions remain warm and humid. In California’s inland valleys the adult flies are most active during spring and fall when highs are between 60° and 80°F, especially when conditions are humid and food is available. The larvae may pupate inside or outside the fruit. Serv. Early harvest of fruit can be important in reducing exposure of fruit to the pest. Spotted wing Drosophila (Drosophila suzukii) larvae in a grape. SWD is widespread throughout all the important production regions in the U.S., Europe and South America and originates from Asia. You don’t notice the larvae until later. there is much to learn and control recommendations will change as Fine netting over whole plants or canes can be useful to keep flies from attacking fruit on blueberries and other small fruit and possibly on branches on small cherry trees. Unlike most other vinegar flies it can damage otherwise unblemished soft and stone fruit including strawberries, raspberries, blackberries, currants, blueberries, grapes, cherries and plums. Egg deposition and larval feeding can occur in maturing, firm fruit; Small (2-3 mm in length) flies with yellow-brown colouring, dark bands on the abdomens and red eyes; Males have a dark spot on the tip of their forewings; Larvae feed internally on fruit, are cream coloured and about 3 mm long 0000132395 00000 n 0000013879 00000 n 0000047936 00000 n Bait the trap with 1 to 2 inches of pure apple cider vinegar; avoid flavored apple cider vinegars. Look closely by comparing anatomical features of the maggots and wing patterns of adult flies. 0000010182 00000 n Spotted Wing Drosophila (SWD) Larvae EM 9096 • October 2014 Figure1a. Spotted Wing Drosophila (SWD) Larvae EM 9096 • October 2014 Figure1a. Authors: J. L. Caprile, UC Cooperative Extension, Contra Costa Co.; M. L. Flint, UC Statewide IPM Program, Davis/Entomology, UC Davis; M. P. Bolda, UC Cooperative Extension, Santa Cruz Co.; J. Spotted wing drosophila: potential economic impact of a newly established pest. Prominent red eyes. Small fruits, notably late bearing raspberries and strawberries, are at particular risk of damage. larvae can be relatively easy to detect. You can gently squeeze the fruit to see if juice leaks from the small punctures; this can indicate presence of the pest. The female will penetrate the skin of soft-skinned fruit with her large ovipositor and lay eggs just under the skin, creating a small puncture, or “sting,” on the fruit surface. 0000003077 00000 n suzukii, originally from southeast Asia, is becoming a major pest species in America and Europe, because it infests fruit early during the ripening stage, in contrast with other Drosophila … Division of Agriculture and Natural Resources 0000030385 00000 n … Protecting Garden Fruits from Spotted Wing Drosophila (Drosophila suzukii). Pest Notes: Spotted Wing Drosophila Photo via Alamy. It attacks soft fruit like raspberry, blackberry, strawberry and blueberry. It became established in Hawaii during the 1980’s, and was first discovered in the continental United States in California in 2008. Outside of fruit can be found feeding within a single fruit product labels make... Very important to monitor SWD adults SWD than others, but a compressed-air sprayer will give more coverage. 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