Spotted wing drosophila (SWD), Drosophila suzukii, is an insect pest of economically valuable small fruit and tree fruit crops. Spotted Wing Drosophila, Drosophila suzukii (Matsumura) a new fruit pest of concern especially for strawberry, blackberry and blueberry growers. 0000079049 00000 n The Alachua Grower (online) Profaizer D, Angeli G, Trainotti D, Marchel L, Zadra E, Sofia M, Ioriatti C, 2012. SWD are very similar in size, shape and appearance to other vinegar flies (i.e. Adult spotted-wing drosophila are small, 2-3 mm in lengthg, and have a wingspan of 6-8 mm. The foreleg of the male sports dark bands on the first and second tarsi. Dark-colored bands on the abdomen. If using insecticides, it is important to monitor for fly abundance before fruit begins to color to be sure treatments are made before they have attacked the fruit. 0000132395 00000 n 0000011758 00000 n UC IPM Home > It became established in Hawaii during the 1980’s, and was first discovered in the continental United States in California in 2008. Spotted wing Drosophila (Drosophila suzukii) larvae in a grape. 0000014490 00000 n PDF reader. Spotted wing drosophila flies and their damage often are not noticed in backyard fruit crops until fruit is being harvested. PDF: To display a PDF document, you may need to use a Growers: ... (236.6 ml) water, may cause larvae to float to surface. Spotted wing drosophila female feeding on water droplet (E. Beers, December 2010) The spotted wing drosophila is an invasive pest from Asia, first discovered in California in 2008. Today, it has spread throughout most of the continental US. Identifying Drosophila suzukii. One to several larvae can be found feeding within a single fruit. Once fruit integrity is compromised by SWD’s activities, common vinegar flies also might oviposit in the damaged fruit. Its body is yellow to brown with darker bands on the abdomen and it has red eyes. 0000003113 00000 n SWD stings are tiny, so a magnifying glass will help you see them. Sprays must be timed to kill adults before they lay eggs, as sprays will not control larvae already in the fruit. Subscribe (RSS) You can use traps to monitor for flies, but it is also important to observe cherry or blueberry fruit regularly as it begins to ripen. Produced by UC Statewide IPM Program, University of California, Davis, CA 95616. Be sure to wait the interval specified on the pesticide label before harvesting fruit. Spotted wing drosophila only lay eggs in not-quite-ripe fruit on the plant. Spotted wing drosophila (SWD), Drosophila suzukii, is an insect pest of economically valuable small fruit and tree fruit crops. Look closely by comparing anatomical features of the maggots and wing patterns of adult flies. 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 … Spotted Wing Drosophila (SWD) Larvae EM 9096 • October 2014 Figure1a. One to three larvae may develop inside each cherry, feeding on the fruit and causing it to become brown and soft. The females do not have spots on wings but have a very prominent, sawlike ovipositor for laying eggs in fruit. A: I think you have spotted some larvae of the spotted wing drosophila (SWD). Spotted wing drosophila may be mistaken for other adult flies and maggots. Adults and maggots closely resemble the common vinegar fly, D. melanogaster, and other Drosophila species that attack primarily rotting or fermenting fruit. The best way to find out if you have spotted wing drosophila in your garden is to set up some simple traps. 0000003678 00000 n Improper application also can result in injury to cherry trees. It attacks all kinds of berries, including strawberries, blackberries , blueberries, stone fruits, and of course, raspberries. larvae can be relatively easy to detect. Unlike most other vinegar flies it can damage otherwise unblemished soft and stone fruit including strawberries, raspberries, blackberries, currants, blueberries, grapes, cherries and plums. 2019 Some cherry varieties might be more susceptible to SWD than others, but more research is required. The SWD larvae will sometimes drop to the soil to pupate and be available to the predators or parasites on the soil surface. Commercial fruit fly traps are available or you can make traps out of 1-quart plastic yogurt (or similar) containers that have a lid. Photo by Jim Jasinski, OSU Extension. Known in Oregon and the Pacific Northwest since about 2009, this species now appears to be established in many fruit growing regions around the country. One generation, from egg to adult, may occur in … 0000003033 00000 n Spotted wing drosophila may be mistaken for other adult flies and maggots. Prominent red eyes. In the case of indeterminate fruiting berries such as raspberries or strawberries, sprays might need to be repeated to keep populations low during summer and fall. SWD quickly spread throughout the Pacific Northwest and Canada, and was found in Florida in 2009. University of Maine Cooperative Extension shows how to identify the damage caused by Spotted Wing Drosophila. Spotted wing drosophila(SWD), Drosophila suzukii, is a ... and the small white larvae feed, eventually causing fruit to collapse. Attacks a range of soft skinned fruit species; ... Larvae feed internally on fruit, are cream coloured and about 3 mm long; Secondary infections can occur at egg laying sites, leading to fruit rot; Flies spread throughout crops by … 0000011005 00000 n Spotted wing drosophila, however, readily attacks undamaged fruit. Two good guides for detecting SWD larvae in fruit samples are available online: Spotted Wing Drosophila (SWD) Monitoring, Identifying, and Fruit Sampling by the small fruit team from Washington State University and Spotted Wing Drosophila Management Recommendations for Michigan Raspberry and Blackberry Growers by the MSU Extension small fruit team. Break open suspect fruit to see if small, white larvae are inside. Spotted Wing Drosophila (SWD) Larvae EM 9096 • October 2014 Figure1a. You also can use traps to detect and monitor SWD adults. (PDF) Corvallis: Ore. State Univ. 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. Eggs develop into adults in as little as 8 days and individual females can lay more than 300 eggs, allowing populations to increase rapidly. 0000002703 00000 n Hang the trap in the shade in your cherry tree or near your berries in early May or well before fruit begins to ripen. Monitoring also will help you time insecticide applications for greatest effect. Drill 10 to 16 holes that are 3/16-inch in diameter around the upper side of the container for fly entry. Protecting Garden Fruits from Spotted Wing Drosophila (Drosophila suzukii). 0000030385 00000 n 0000014989 00000 n cVA is a male-specific attractant, but spotted wing drosophila does not produce cVA although they may have retained the ability to detect it. If monitoring indicates a need to spray, the application should be made as soon as the fruit just begins to turn from yellow to pink. Fruit flies (also called vinegar flies) are often associated with damaged, overripe, or rotting fruits and vegetables. And unlike other fruit flies that target mostly rotting or fermenting fruit, SWD targets fruit right on the tree, laying their eggs in the young fruit and eventually turning it into a wormy mess. Walton, V., J. Lee, D. Buck, P. Shearer, E. Parent, T. Whitney, and A. J. Dreves. Spotted wing drosophila may be mistaken for other adult flies and maggots. FOR ALL OTHER USES or more information, read Legal Notices. 0000131471 00000 n Suggested methods were adapted for NY growers in Guidelines for Checking Fruit for SWD Larvae in … You don’t notice the larvae until later. Spotted Wing Drosophila. Genus species: Drosophila suzukii SWD looks like the typical vinegar fruit fly, Drosophila melanogaster, of genetics fame.Female vinegar fruit flies lay eggs in damaged or overripe fruit and, hence, are mainly a nuisance. “Spotted wing drosophila have small, white legless larvae with no apparent head, and damaged fruit often feels soft and leaks juice,” Hamby says. 0000002521 00000 n It attacks soft fruit like raspberry, blackberry, strawberry and blueberry. Under conditions favorable to the SWD, the fruit begin to collapse as quickly as two days after the eggs were laid. Small fruits, notably late bearing raspberries and strawberries, are at particular risk of damage. Fruits like cherries will show visible dents around the larvae. Biology of the Spotted Wing Drosophila. Spotted wing drosophila pupating on the surface of a cherry. It also has been observed occasionally attacking other soft-flesh fruit such as plums, plumcots, nectarines, and figs when conditions are right. Drosophila or pomace flies are small insects commonly found in association with over-ripened or rotten fruits and vegetables. 0000007900 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. (PDF) Corvallis: Ore. State Univ. And unlike other fruit flies that target mostly rotting or fermenting fruit, SWD targets fruit right on the tree, laying their eggs in the young fruit and eventually turning it into a wormy mess. A combination of preventive and cultural practices, discussed below in Cultural Control, might be useful for reducing problems on fruit trees and berries. SWD Management There are three important components to effective SWD manage-ment: Monitoring, Identification, and Control. Spotted Wing Drosophila. 0000123991 00000 n Before you spray, confirm that you have SWD in your area by hanging out traps or checking fruit. Males are smaller than females. See Identifying Drosophila suzukii in References for help with distinguishing this pest from other flies. Pest Notes: Spotted Wing Drosophila 0000006649 00000 n UC ANR Publication 74158. Recognize Fruit Damage from Spotted Wing Drosophila, Provisionary Guidelines: Management of Spotted Wing Drosophila in Home Garden Situations, © 2019 Regents of the University of California, Division of Agriculture and Natural Resources. The most distinguishable trait of SWD males is a black spot towards the tip of each wing. Put fresh apple cider vinegar and a drop of soap in each week. There are black stripes down its abdomen. If you find infected fruit you should either harvest all the fruit immediately or spray to prevent the damage from increasing before harvest. The fly lays eggs in the ripening fruit. After maturing, the larvae partially or completely exit the fruit to pupate. 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. Serv. Eggs hatch and maggots develop and feed inside the fruit, causing the flesh to turn brown and soft with sunken areas that can exude fluid on the surface of smooth-skinned fruit such as cherries and blueberries. 0000049415 00000 n For instance, adult Western cherry fruit flies, Rhagoletis indifferens, in another family of flies called Tephritids, are much longer at 3/16 inch than SWD adults and have a dark banding pattern on their wings. If a small percentage of fruit is infested, you can salvage some of the crop by harvesting the crop immediately and sorting and removing fruit with stings on the surface. Add a drop of unscented liquid dishwashing soap to break the surface tension so the flies will drown. Spotted Wing Drosophila infestation in fall red raspberries Asked August 26, 2015, 12:33 PM EDT I have heard that if the berries are infected and put in the fridge … There are also a couple of possibilities for predators on the spotted wing drosophila (SWD) that are commercially available. 0000131844 00000 n 0000004733 00000 n 0000019620 00000 n Spotted wing Drosophila (Drosophila suzukii) larvae in a grape. Like other members of the Drosophilidae, D. suzukii is small, approximately 2 to 3.5 millimetres ( ⁄64 to ⁄64 in) in length and 5 to 6.5 millimetres ( ⁄64 to ⁄4 in) in wingspan and looks like its fruit and vinegar fly relatives. 0000111668 00000 n The female has a long, sharp, serrated ovipositor. The lack of detection this far does not mean that SWD is not yet active in the state, only that we are not monitoring where they may be breeding, such as in wild hosts in woodland areas, at this time. Nondiscrimination Statement. Larvae are tiny, white cylindrical maggots a little longer than 1/8 inch when full grown. EM 9021. Research studies to define the biology and life cycle of SWD in California are still underway; however, like other vinegar flies, it appears to have a short life cycle of one to several weeks depending on temperature and can have as many as 10 generations per year. common name: spotted-wing drosophila scientific name: Drosophila suzukii (Matsumura) (Insecta: Diptera: Drosophilidae) Introduction - Distribution - Description - Life Cycle - Hosts - Damage - Management - Selected References Introduction (Back to Top). All contents copyright © Identification of Spotted Wing Drosophila flies. 0000131050 00000 n h�b```b`�x�����?�A��b�,G&�(�0�&��$`�.,�*9�����B u�R�Eߞ€�q�D4�P�x}���ޛ���f�Α T����T��. Bolda M, Goodhue RE, Zalom FG, 2010. 0000017631 00000 n This fruit fly, which is a quarantine pest, occurs in Washington, Oregon, and other states but has not established in California. Trapping is important, however, for monitoring for the pest. Larvae feed inside ripe or ripening fruit, causing softness and opening the skin with holes. 0000016221 00000 n For noncommercial purposes only, any Web site may link directly to this page. Close-up of the wing of a male spotted wing drosophila. The spotted wing drosophila will attack thin-skinned fruit such as raspberry, blackberry, blueberry, strawberry, cherry, plum, peach, nectarine, and sometimes grape. Generally, soft-skinned fruit become vulnerable to attack as they begin to soften and tur… 0000132862 00000 n At least 100 fruit per block per harvest should be observed for infestation. Introduction; Adults; Eggs; Larvae; Pupae; Introduction. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance. It attacks soft fruit like raspberry, blackberry, strawberry and blueberry Zalom FG, 2010 ovipositor is and! 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