Potential deterrent for Drosophila suzukii, isolated from a plant pathogen Botrytis cinerea

The invasive spotted wing drosophila (SWD), Drosophila suzukii Matsumura (Diptera: Drosophilidae), is a serious threat to soft-skinned fresh fruits in the US and Europe.  Our goal is to identify chemicals, with an emphasis on volatiles produced by potential antagonists, that can be potentially used as a deterrent component in a push-pull management system for SWD.  In laboratory two-choice bioassays, significantly more female SWD avoided traps baited with an attractive source (raspberry infused agar media) plus a small piece (1 cm²) of the raspberry agar with actively growing Botrytis cinerea over traps baited with the same attractive source plus 1 cm² piece of sterile raspberry agar. Headspace volatiles collected from the raspberry fruit agar with or without Botrytis were analyzed using GC-EAD for the identification of antennaly active compounds.  The behavioral response of female SWD to the EAD-active Botrytis compounds were evaluated.