Spotted-Winged Drosophila

Spotted Winged Drosophila Fly, male

Spotted Winged Drosophila Fly, male

Spotted Winged Drosophila (Drosophila suzukii)  (SWD) is a vinegar fly of East Asian origin that can cause damage to many soft-skinned fruit crops.  SWD pierces seemingly healthy fruit, and lays its eggs.  The eggs hatch in about 3 days, the larvae feed on the fruit and emerge as adults after 6-28 days.  Early detection is critical because symptoms often do not appear until after the fruit is harvested.  Commonly confused with the common fruit fly, Drosophila melanogaster, SWD differs as it attacks unripe to ripe fruit, whereas the common fruit fly feeds on overripe and rotting fruit.
SWD most commonly affects raspberries, strawberries, blueberries, cherries and plums.  It was first identified in Manitoba in commercial berry fields in August 2013.

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