Beverly Gerdeman

Could predatory flies provide early season control of spotted wing drosophila in red raspberry?

Posted by Beverly Gerdeman | May 22, 2017

Featured BIOAg research: Potential for early season control of spotted wing drosophila by predatory flies (Scathophagidae) as a secondary benefit of manure amendments in red raspberry

Spotted wing drosophila on raspberry [male in focus (L), female out of focus (R)]. Photo: B. Gerdeman

Spotted wing drosophila (SWD), Drosophila suzukii, is considered the most important pest of soft fruit in Washington State. Current control methods require weekly insecticide applications, which are unsustainable. So far however, no effective biological controls have been identified. Large numbers of yellow dung flies were observed in a Whatcom County red raspberry field following an early spring manure application. This prompted an investigation into the potential of yellow dung flies to impact SWD populations by feeding on overwintering females returning to berry fields early spring.

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Contact Beverly Gerdeman

Email: bgerdeman@wsu.edu