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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




Distribution maps

Economic and environmental impact

Biology and life cycle

SWD Resources:


Spotted Wing Drosophila Blog:

Latest posts:

  • Is SWD still a problem?
    In the past eight years, we’ve progressed in our ability to manage spotted wing drosophila (SWD), but it remains a serious economic problem for fruit growers in NY and across the US.  Do you think that statement is correct? If yes, we could use your help in telling the USDA just that—that SWD remains a ...continue reading "Is SWD still a problem?"
  • Strawberry Substrate Workshop, February 11-13, 2020
    An in-depth strawberry substrate workshop will be held February 11–13, 2020  at the Moakley House, Ithaca, NY  Growing strawberries in substrate (soil-less media) can help prevent soil-borne diseases. It can also increase yields, improve quality, and reduce the costs associated with pesticides, fertilizer, and water. In this 3-day workshop, led by Dennis Wilson of Delphy, a worldwide ...continue reading "Strawberry Substrate Workshop, February 11-13, 2020"
  • What does SWD do in the winter?
    The Sustainable SWD Management Project's November 5 webinar covered the seasonal biology and movement of SWD, "SWD in Space and Time: What do we know about the seasonal biology and movement of SWD?" The recording from the webinar is now available on the project's website. Access the recording here: You'll gain information on: how ...continue reading "What does SWD do in the winter?"
  • Cull fruit and SWD
    Fruit that has dropped to the ground in orchards and berry plantings provides resources for SWD — food and reproduction. Populations of SWD are climbing. SWD made up almost half of the fruit flies caught in traps in an unsprayed research site where ~300 were caught in four traps.  I've seen lots of fruit flies ...continue reading "Cull fruit and SWD"
  • Spotted Lanternfly IPM Conference
    Spotted Lanternfly — On the Doorstep Or Already In Our Fields? Learn more at the 2019 IPM Conference hosted by the New York State Integrated Pest Management Program on August 15, 2019 at the Broome County CCE Farmers Market, 840 Upper Front St., Binghamton, NY. Yes! That's this Thursday, 8:30 to 4:30. Lunch provided. Earn recertification ...continue reading "Spotted Lanternfly IPM Conference"
  • Managing SWD in blueberries
    Blueberries are highly susceptible to SWD. Although early maturing varieties can escape infestation in some years, that hasn’t been the case this year in many areas of NY State. U-Pick and farm stand customers want the best from farm-fresh blueberries and SWD can mar that experience — so be proactive — make sure your customers ...continue reading "Managing SWD in blueberries"
  • Sustained catch in Dutchess, Erie, Herkimer, Livingston, Onondaga, Orleans, & Tioga Counties
    Sustained SWD catch was obtained over the last couple of weeks in several counties — Dutchess 1 SWD, Herkimer 6 SWD, Livingston 18 SWD, Onondaga 16 SWD, Orleans at two farms 11 and 9 SWD, and Tioga 1 SWD. Last month, I missed reporting sustained catch in Erie County on June 6, 1 female SWD. ...continue reading "Sustained catch in Dutchess, Erie, Herkimer, Livingston, Onondaga, Orleans, & Tioga Counties"

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