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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:

  • Have you seen blueberry stem gall?
    The blueberry stem gall wasp is a native insect of the Northeastern United States. While traditionally it was rarely seen in commercial blueberry production, recently increased numbers of galls have been observed in Michigan on older varieties especially ‘Jersey’, ‘Pemberton’ and ‘Northland’. The increases in blueberry stem gall are likely due to a combination of […]
  • Intense learning on blueberry – sign up now!
    Registration is now open for two Blueberry Intensive Workshops hosted by the New York State Berry Growers Association! They’ve partnered with experts at Cornell Cooperative Extension (CCE) to bring you the region’s first-ever blueberry intensives – two daylong sessions, starting at 8:30 AM: March 5, 2019 – Ellicottville, NY in Cattaraugus County March 14, 2019 – Millbrook, NY in […]
  • Another spotted invasive? spotted lanternfly
    Yes, spotted lanternfly is looming on the horizon and we are teaming up to bring you information in a series of webinars. Each webinar will focus on, and be tailored to, a specific commodity group: Feb. 26, 2019, 10:00 a.m. – Spotted Lanternfly Basics for Hops, Berry, and Vegetable Growers Feb. 26, 2019, 1:00 p.m. – Spotted Lanternfly […]
  • High Tunnel Farmer-to-Farmer Meeting
    Attend this workshop in Poughkeepsie, NY on Monday, 4 Feb 2019 (snow date Thursday, 7 Feb).  Talk with farmers about high tunnel production! They know and you can learn about… keeping the right level of soil fertility season-long selecting the right high tunnel for you construction considerations biological pest and disease management set the agenda! […]
  • Early spring food for pollinators
    Native, non-weedy, shrub willow blooms in early spring, a time that is critical for pollinators because of the low availability of food sources.  Shrub willow supports a large diversity of pollinators that feed on its abundant pollen.  Research has shown that wild bees can be an important component of crop pollination.  Also, diversified landscapes that […]
  • Hummingbirds may reduce SWD
    Research in raspberries at Cornell AgriTech over the last four years has shown promise as an alternative tactic to reduce the impact of SWD on berries. As described in a previous blog posted in 2014, Hummingbirds, these birds may indeed enjoy eating SWD. Preliminary data analysis for 2018 shows that when SWD numbers are very low […]
  • Spotted lanternfly found in two counties in NY
    The New York State Departments of Environmental Conservation (DEC) and Agriculture and Markets (DAM) today confirmed that spotted lanternfly (SLF), an invasive pest from Asia, has been found in Albany and Yates counties. A single adult insect was discovered in a vehicle in the Capital District. In addition, a single adult insect was reported on a private […]

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