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Spotted Wing Drosophila

The Spotted Wing Drosophila (SWD) is an invasive vinegar fly which lays its eggs in immature and ripe fruit; thus its larvae may be present in otherwise marketable fruit. So far, raspberries, blackberries, and blueberries produced in mid-summer or later have been affected to the greatest extent, but SWD can also affect cherries, plums, peaches, and grapes or any other soft thin-skinned fruit.
Drosophila suzukii

Drosophila suzukii

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Drosophila suzukii was first found in the Northeastern U.S. in 2011 and has been problematic ever since.

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There are a number of characteristics that differentiate SWD from other common vinegar (fruit) flies.

There are several fruit fly species in Pennsylvania that may be mistaken for D. suzukii. Make sure there is a proper identification before taking action.

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From Oregon State University.