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ViewAttendees 4

10-Minute Paper

Plant-Insect Ecosystems

P-IE: Biological Control 1

Patterns of parasitism of spotted-wing drosophila, Drosophila suzukii, by Leptopilina japonica across different host plants in Michigan

Sunday, November 5, 2023
2:00 PM – 2:12 PM ET
Location: Gaylord National Resort & Convention Center, National Harbor 2
In-Person
Spotted-wing drosophila, Drosophila suzukii, continues to be a management challenge even more than a decade after first being detected in North America. While commercial growers are able to achieve control using insecticides, additional options for sustainable management of this pest are needed. The recent discovery of the parasitic wasp Leptopilina japonica in western North America provides an opportunity to utilize biocontrol as another management tool. In this study we conducted monitoring of D. suzukii-infested fruit in Michigan to determine whether fly larvae are being parasitized by L. japonica or other wasp species. We sampled ripe wild fruit as well as highbush blueberries from both sprayed and unsprayed fields and sampling took place across a wide geographic area from July through September. Leptopilina japonica was reared out of fruit samples throughout the season and across the entire sampling area. Parasitism in sprayed blueberry fields was not evident until late in the season once insecticide applications had ceased. Implications for biocontrol in commercial blueberries will be discussed.