Vigorous trapping recommended
As wine and juice grapes in eastern Washington mature and ripen, numbers of the spotted wing drosophila have increased in vineyard traps, reports a team of Washington State University entomologists. Although field research conducted through the end of September showed that Washington grapes were not preferred SWD hosts, there is concern they will become better hosts as fruit ripens. Research found that SWD are more likely to oviposit on injured fruit.
WSU recommends a vigorous vineyard monitoring program. Information about trapping can be found at http://extension.wsu.edu/swd. The most recent research results from WSU’s grape field tests is contained in the Spotted Wing Drosophilla October 4, 2010 grape update.