Damage

A female fly penetrates fruit with its large serrated ovipositor, leaving a small puncture wound. Infested fruit then becomes brown, soft, and sunken and will typically develop microbial growth at the puncture site.

SWD puncture wound in a blueberry. Carolyn Teasdale, ES Cropconsult.

Blueberry fruit with a developing SWD inside. Note the brown, soft, and sunken quality to the fruit. Mark Longstroth, MSU Extension

SWD larvae developing inside blueberry fruit. Carolyn Teasdale, ES Cropconsult.

Monitoring

This short video demonstrates the salt flotation method for monitoring SWD larvae in fruit.

Management

The most important component of a management regime for SWD involves intensive monitoring for the presence of adult flies. Several homemade and commercial traps are available for SWD control, as well as several bait and lure formulations. Below is a list of extension resources detailing current management protocols for SWD from several states in different crops.

Homemade and commercially available traps used to monitor and control adult *Drosophila suzukii*. (a) Clear, plastic, 20 oz. deli-cup trap baited with apple cider vinegar with red mesh coverings on the two side openings, (b) a similar clear, plastic, deli-cup trap containing apple cider vinegar and a sticky card to capture flies. (c) Another homemade trap except that this trap utilizes a red 12 oz. Solo cup trap with numerous holes punctures around the lid as entry points, (d) Pherocon trap, (e) Drosal Pro trap, (f) ISCA trap, (g) Contech trap. Pictures were contributed by Robert Holdcraft and permission was granted from Andermatt Biocontrol for use of their Drosal Pro image.

Commercially available baits and lures used to trap adult *Drosophila suzukii* including (a) apple cider vinegar, (b) yeast typically added to sugar and water, (c) torula yeast tablets from ISCA Technologies, (d) Suzukii Trap bait, (e) DrosaLure, (f) Pherocon SWD Dual Lure, (g) Pherocon SWD lure, (h) and Scentry Lure. Pictures were contributed by Robert Holdcraft and permission was granted from Andermatt Biocontrol for use of their DrosaLure image.

Available Management Resources

Western United States

University of California – General SWD IPM
Colorado State University – General SWD IPM
Oregon State University – Specific SWD IPM in Oregon Blueberry

Midwestern United States

Michigan State University – Specific SWD IPM in Michigan cherry and blueberry
University of Wisconsin – General SWD IPM
University of Minnesota – Specific SWD IPM for the Midwestern U.S.

Eastern United States

Cornell University – Specific SWD IPM in New York blueberry and grape. This site also contains an active SWD distribution map for New York
Spotted Wing Drosophila IPM in Blueberries from the NE IPM Center SWD Working Group
Spotted Wing Drosophila IPM in Raspberries and Blackberries from the NE IPM Center SWD Working Group
Spotted Wing Drosophila Invasive Species and Exotic Pests – Fact sheet from the New York State IPM Program
Spotted Wing Drosophila: An invasive and destructive pest on raspberries, blueberries, blackberries, cherries, and more – Trifold brochure from the New York State IPM Program
University of Maine – Monitoring blog of SWD in Maine caneberry