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Project Noah Nature School
Polystepha pilulae
The larvae of tiny flies called Gall Midges develop in these one celled "blister galls". Brown, pea-sized galls on the leaves of a young Northern Red Oak (Quercus rubra). Most of the leaves on this particular tree were affected.
Bayard Cutting Arboretum, Islip, New York.
Spotted on Aug 10, 2013
Submitted on Jan 16, 2014
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