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Cornell Fruit Resources

Resources for Commercial Growers

Spotted Wing Drosophila (SWD)

Genus species: Drosophila suzukii

The spotted wing Drosophila (SWD) is a vinegar or fruit fly of East Asian origin. It made its way into New York by 2011. Today, it has spread throughout most of the continental US. It can directly infest the fruit of many plants, but is most attracted to raspberries, blackberries, blueberries, and other late-season, soft-flesh fruits — cultivated and wild.

SWD deserves notice because, unlike her relatives, which lay eggs on over-ripe or rotting fruit, she can lay eggs inside fresh fruit, often before harvest. After only a few days, the fruit skin becomes dimpled or wrinkled, forming craters in the fruit. Without control measures, late season raspberries, blackberries and blueberries can suffer upwards of 80% crop loss.

Cornell University is coordinating SWD monitoring in NY. A map of current findings is found on the Distribution maps page and the SWD blog reports where it is being caught.

Crops of concern and wild hosts

Monitoring

Identification

Management

Distribution maps

Economic and environmental impact

Biology and life cycle


SWD Resources:


 


Spotted Wing Drosophila Blog:


Latest posts:

  • Catching up on sustained catch reports
    Sustained catch (two weeks in a row catching SWD) has occurred in several counties: Orleans on June 15 and 22, Niagara on June 28 and 29, Ulster on June 28 and 29, Clinton on July 10, Essex on July 10, and Livingston on July 13. In Essex County the sustained catch had 144 SWD, caught []
  • Sustained catch in St Lawrence County
    4 female SWD were caught the week ending July 15, 2017 in two traps set near some wild raspberries growing outside a blueberry planting. This is sustained catch at this location. Paul Hetzler, extension educator, St Lawrence County CCE, is monitoring these traps as part of a berry research project. Although Paul expected to find []
  • Sustained catch in Genesee County
    14 SWD were caught on July 10, 2017 in two traps set in a raspberry planting. 7 females were in the trap set within the crop; 4 female and 3 male SWD were caught in the trap set on the edge of the planting. These traps are being serviced by Jan Beglinger, extension educator, Genesee []
  • First catch in St Lawrence County
    SWD was confirmed caught on July 8, 2017 from traps set in a blueberry planting in St Lawrence County. 2 female SWD were caught in one of two traps. There are ripening Blue Ray, Duke and Blue Crop blueberry varieties in the field, but Patriot is still green at this location. These traps are being []
  • First catch Livingston County
    3 SWD were caught in traps checked on July 6, 2017 — 2 female and 1 male were found in the trap set on the edge of the small blueberry planting at this location. Practice these IPM tactics for managing SWD: trapping to know when SWD has arrived at the fruit planting; carefully monitoring the []
  • First and sustained catch Wyoming County
    First catch in a raspberry planting on July 6, 2017 of 3 female SWD in a trap within the crop and 1 female in a trap set on the edge of the crop. Sustained catch on July 12, 2017 of 18 SWD, 8 females and 10 males. Within the crop the trap caught 7 male []
  • Sustained catch in Wayne County
    Confirmed sustained catch occurred in Wayne County on June 28, 2017 in ripe summer raspberries (2 females caught in two of four traps) and on July 11 in a blueberry planting (1 female SWD in one of four traps). These traps are being monitored by Nicole Mattoon, IPM field technician, and Taylere Herrmann, IPM summer []

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