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 This Drosophila, or cherry vinegar fly, Drosophila suzukii (Diptera:
Drosophilidae). In June 2009 the
insect was trapped over a wide area in northern California including Santa
Clara, San Benito, Santa Cruz and Monterey Counties. This fly is now considered established in
California. Spotted wing Drosophila is a small fly, around
2.6-2.8 mm in length, beige-yellow in color with brown bands on the abdomen.
Adults have characteristic bright red eyes, and male flies have a prominent
dark spot on the distal margin of the wings.
This fly is native to Asia and has been recorded from China, Japan,
Korea, and Thailand. This pest is
also problematic in Spain and Hawaii.
This fly damages berry crops,
especially fresh cherries, strawberries, raspberries, blackberries, and
blueberries. It may also attack
grapes, and some stone fruits. White legless maggots feeding internally on
fruit pulp cause damage to berries.
Female flies use their ovipositor, a type of egg laying tube, to
puncture or "sting" the skin of healthy growing berries and the egg
is inserted into this wound. Fluids
may leak from this puncture, and often rot-type pathogens will enter the
wound also causing damage. Spotted
wing drosophila has short generation times.
It has been estimated that during cherry fruiting season the fly may
have up to 2-3 generations, and over the course of the year, as many as
10-15, depending on location and local climatic conditions. Prolonged temperatures around or in excess
of 30oC (86oF) may be detrimental to fly populations
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