Using volatile chemicals from wine and vinegar to attract spotted wing drosophila Drosophila suzukii.

Field experiments were conducted to determine the attractiveness of volatile chemicals that were isolated from the headspace of Merlot wine and rice vinegar, and found to be EAD active.   Each of these chemicals was tested alone and in combination with a mixture of acetic acid and ethanol, as a trap bait for spotted wing drosophila (SWD).  The objectives of the study were to determine if each compound is attractive by itself, and if it is co-attractive with acetic acid and ethanol.   A small number of these chemicals were attractive when used alone as trap baits, and a larger subset of the chemicals showed co-attractiveness with acetic acid and ethanol.  Generally, these results are consistent with prior evaluations of the chemicals in a laboratory bioassay.   Further evaluations of more complex combinations of the chemicals that were attractive or co-attractive may provide superior chemical lures for SWD.