Location: Horticultural Crops Research
2012 Annual Report
Wild and ornamental fruit in residential and near crop fields were observed for ripening and collected for laboratory tests where fruit were exposed to SWD for 24 hours with no other host available. Fruits from gooseberry, Indian strawberry, salal, wild cherry, box huckleberry, cherry laurel, hardy kiwi, lingonberry, redtwig dogwood, Pacific Mountain ash, sarcococca, and snowberry were susceptible to SWD. Other fruits from Chinese and Japanese holly, cotoneaster, heavenly bamboo, grape tomatoes, acuba, rosehips, ginko, and hawthorne were not susceptible or were rarely attacked with limited development. The wild and ornamental hosts now known to be susceptible to SWD will identify critical areas in farm/home landscapes for further management and monitoring.
Various natural enemies have been observed among fruits infested with SWD, and their potential as biocontrol agents were examined in the lab and field cages. The release of minute pirate bugs, Orius insidiosus, into outdoor potted blueberry plants with SWD infestations appeared to reduce the number of surviving SWD by 49%, 17%, 27% and 1% during four trials, but results were not significant. The rove beetle, Atheta coriaria, is a ground dwelling predator, and reduced the number of surviving SWD within infested blueberries in the laboratory. Both predators are commercially available and may provide growers and homeowners with additional control options to suppress SWD populations, including reservoir sites. This research was conducted in support of objective 2B of the parent project.