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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:

  • Berry Crops Field Workshop
    Tomorrow! Tuesday, August 29, 2017 from 5:00 to 7:00 PM at The Berry Patch, 15589 NY-22, Stephentown, NY 12168 this workshop will cover the following topics: Plasticulture strawberry production for June bearing and day neutral varieties Low tunnel strawberry production High tunnel raspberry production Exclusion netting to control SWD in blueberries Using computer models to []
  • SWD trap network alert
    As of August 7, 2017, all of the 32 SWD trapping sites have caught SWD in 21 counties in New York. To prevent fruit infestation now, susceptible fruit crops need to be protected with an insecticide spray program or have already had exclusion netting in place. Reports are coming in from growers stunned by the []
  • First catch in Herkimer County
    Herkimer County traps caught 10 SWD, 7 males and 3 females, on August 1, 2017. Four traps are being monitored in a blueberry planting, which is still not at peak ripeness. The grower is hoping to get a couple more weeks of picking out of the planting. Traps in Herkimer County are being monitored by []
  • More SWD being found – cherries at risk
    In the last week of July 2017, my program found up to 100 SWD in some of the SWD traps in our raspberry research plot in Geneva, NY. Without a doubt, pressure from SWD and fruit infestation levels will be increasing as the SWD population explodes. In addition, fruit crops normally escaping infestation are reporting []
  • Blueberry grower reports
    Reports from blueberry growers have come in. SWD — caught in traps, found in fruit, and plantings shut down. One of these growers in the Southern Tier of NY, caught a single male in a trap on Sunday, July 23, 2017, and then, In a matter of 3 days my 4 traps exploded with SWD. []
  • 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 []

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