Location: Invasive Species and Pollinator Health
Project Number: 2030-22000-029-18-S
Project Type: Non-Assistance Cooperative Agreement
Start Date: Aug 1, 2016
End Date: Jul 31, 2021
1) To monitor seasonal population dynamics of spotted wing drosophila (SWD) and generalist parasitoids of SWD in crop fields and adjacent non-crop habitats. 2) To examine whether non-crop habitats act as seasonal refuges for SWD and/or its parasitoids. 3) To explore whether augmentation of parasitoids in non-crop habitats helps control SWD in adjacent crop fields.
The cooperator will use traps baited with apple cider vinegar to monitor SWD numbers, and sentinel SWD pupae from laboratory colonies to monitor parasitism of SWD by generalist pupal parasitoids. Traps and sentinel pupae will be deployed at six sites along transects that extend from strawberry fields into adjacent non-crop habitats containing known hosts of SWD (i.e., blackberry in riparian areas) for one week periods in winter, spring, summer and fall. Numbers of the resident SWD pupal parasitoid Pachycrepoideus vindemiae will be augmented in non-crop habitats at three of these sites in early spring, when numbers of SWD are low and before SWD has appeared in the strawberry fields. Numbers of P. vindemiae will not be released at the three other sites, which will act as controls. Pachycrepoideus vindemiae will be mass-reared for this effort at the UC Kearney Agricultural Research Center, Parlier, CA.