Biology and Management of Spotted Wing Drosophila in Fruits

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Spotted wing drosophila (SWD) was recorded on multiple crops in California during 2008 and 2009 and in British Columbia, Oregon, and Washington in 2009. Producers of stone fruits (cherries and peaches) and small fruits (blackberries, blueberries, raspberries, and strawberries) experienced substantial economic losses. California growers reported a 25 percent loss of fresh cherries. Several California, Oregon, and Washington berry growers reported 100 percent crop losses in late-ripening small fruits during 2009, and growers in Oregon reported 100 percent crop losses on fresh peaches. The pest subsequently invaded Florida, North Carolina, Michigan, and beyond. Because of the rapid spread and uniqueness of this pest in the U.S., very little information is available on SWD biology, monitoring, and management. Information on overwintering capability, spring emergence, seasonal abundance, susceptible fruit stages, and detailed control strategies is needed for local strains of SWD, and information on integrated and sustainable system-wide control strategies is essential in order to facilitate financial survival of growers.

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