Skip to main content

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




Distribution maps

Economic and environmental impact

Biology and life cycle

SWD Resources:


Spotted Wing Drosophila Blog:

Latest posts:

  • First find in Chemung County
    Three SWD were caught in two traps set in and on the edge of a blueberry planting in Chemung County; 2 males and 1 female. These traps are being monitored by Shona Ort, Chemung County Cornell Cooperative Extension. Blueberries are ripe at this location and an insecticide program will be put into place this week. []
  • Sustained catch across NY
    SWD has now been caught two weeks in a row in Columbia, Livingston, Onondaga, Orleans, Saratoga, Washington, Wayne, and Wyoming Counties. Its time to pay attention to SWD and protect ripe and ripening fruit crops from infestation. SWD management SWD monitoring Crops of concern SWD identification NY distribution map Details about each Countys sustained catch: []
  • Tart cherry SWD update
    We have caught SWD at all but one of the seven tart cherry sites we are monitoring in Western NY, Wayne and Ontario Counties. Counts are still low and it is likely that the hot and dry weather, as well as insecticide protection, has held things in check. Weather has turned cooler and rains have []
  • Tonight! — SWD Field Meeting, Hudson Valley
    Starting at 5:00 PM today, Thursday, July 19, 2018, a field meeting on Exclusion Netting SWD Monitoring will be held. The meeting runs from 5:00pm to 7:00pm at the Poughkeepsie Farm Project. Attend the meeting to see and learn about an SWD exclusion netting trial in raspberries! Peter Jentsch, entomologist with the Hudson Valley Research Lab, will []
  • First find in Livingston County
    One female SWD was caught in a trap set in a small blueberry patch in Livingston County during the week ending July 12, 2018. These traps are being monitored by Dave Thorp, Livingston County CCE, and Ryan Parker, NYS IPM, sorted through the catch to identify the SWD. A recap: SWD monitoring, – describes what you []
  • First catch in Wayne and Onondaga Counties
    SWD were caught in a raspberry planting in Wayne County and in two blueberry plantings, one each in Wayne and Onondaga Counties during the week ending July 10, 2018. Fruit is ripe and harvests are underway at these farms. These traps are being monitored by Ryan Parker and Nicole Mattoon, working with Juliet Carroll, NYS []
  • Sustained catch in Niagara County
    11 SWD were caught during the week ending July 10, 2018 in two traps set in a raspberry planting in Niagara County, indicating sustained catch.  The trap set within the crop caught 2 females and 6 males and 3 females and zero males were found in the trap set in the nearby hedgerow. This jump in []

powered by RSS Just Better 1.1 plugin

Skip to toolbar