Spotted Wing Drosophila
Welcome to MSU’s Spotted Wing Drosophila site
This site contains information and links for growers and homeowners about a new invasive pest in Michigan, the Spotted Wing Drosophila.
For weekly reports on the status of this pest, stay informed through MSU Extension’s Fruit & Nuts News.
Weekly Michigan spotted wing Drosophila reports:
- Aug. 26, 2014 - Spotted wing Drosophila numbers continue to rise across the monitoring network. Protect susceptible crops where they are detected.
- Aug. 19, 2014 - Spotted wing Drosophila numbers continue to rise across the monitoring network. Protect susceptible crops where SWD are detected.
- Aug. 13, 2014 - Spotted wing Drosophila numbers continue to rise across the monitoring network. Protect susceptible crops where they are detected.
- Aug. 7, 2014 - Spotted wing Drosophila numbers are up from last week and are now being detected statewide. Protect susceptible crops where SWD is detected.
- July 29, 2014 - Spotted wing Drosophila numbers remain steady in southwest Michigan, still low in other areas; protect susceptible crops where they are detected.
- July 22, 2014 - Spotted wing Drosophila numbers are climbing in southwest Michigan, but still low in other areas. Protect susceptible crops where they are detected.
- July 15, 2014 - Spotted wing Drosophila numbers are increasing in southwest Michigan; protect susceptible crops where they are detected.
- July 8, 2014 - Spotted wing Drosophila continues to be caught in southwest Michigan and has been detected in two northwest counties this week.
- July 2, 2014 - Catches of spotted wing Drosophila continue into their second week, with numbers remaining low.
- June 24, 2014 - First catches of spotted wing Drosophila are two weeks later than this time last year. Traps should be deployed already; protect ripening berries.
Some key articles from MSU Extension News:
- Vigilance needed against spotted wing Drosophila for berry growers still harvesting (Aug. 21, 2014)
- First spotted wing Drosophila flies of 2014 detected in MSU Extension monitoring network (June 23, 2014)
- New label issued for Fyfanon for spotted wing Drosophila control in Michigan blueberries (May 6, 2014)
- 2014 statewide trapping system crucial for spotted wing Drosophila and brown marmorated stink bug (Jan. 14, 2014)
The Spotted Wing Drosophila (SWD) is a vinegar fly of East Asian origin that can cause damage to many fruit crops. This small insect has been in Hawaii since the 1980s, was detected in California in 2008, spread through the West Coast in 2009, and was detected in Florida, Utah, the Carolinas, Wisconsin and Michigan for the first time in 2010. Because the flies are only a few millimeters long and cannot fly very far, natural dispersion between states is unlikely. Human-assisted transportation is a more likely cause of the recent rapid spread. It appears that this insect has become widely established through North America.
What crops are affected?
SWD has been detected in traps located near berry crops, grapes, cherries and other tree fruits. The flies have a preference for softer-fleshed fruit.
Status in Michigan
In fall 2010, SWD was detected in Michigan for the first time as part of a widespread Early Detection and Rapid Response program. SWD flies have now been detected in 22 counties in the southern peninsula of Michigan. Activity period spans from June through to late fall.
What is being done?
A SWD Response Team has been formed that combines the expertise of MSU entomologists, horticulturalists, Extension educators, and Michigan Department of Agriculture staff. This website will be the central location for dissemination of information about this insect. Check back for updates. This team is also helping to coordinate research projects to understand how best to protect fruit from infestation by this new pest.
We are confident that the Integrated Pest Management (IPM) programs available for SWD control can be implemented to enable continued harvest of high-quality crops. See our fact sheets for English and Spanish information on monitoring for this pest, and recommendations for management in blueberry (last updated June 2012).
1) MSU Fact sheet, available in English and Spanish.
2) MSU‘s guide to identifying spotted wing Drosophila and separating them from other species caught in traps.
3) Management guides for fruit crops.
4) SWD Information from Oregon State University
5) Past articles from MSU Extension’s Fruit & Nut News
Funding for the SWD Response Team
The SWD Response Team is funded by Project GREEEN, the Michigan Department of Agriculture and Rural Development, and USDA.