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Photo#707201
Elm galls  - Aceria parulmi

Elm galls - Aceria parulmi
Warren Twp. , Somerset County, New Jersey, USA
September 23, 2012
very common on top of elm leaves (not sure what species of elm). only a slight dent visible below.

Moved
Moved from Unidentified Galls.

Moved
Moved from ID Request.

mite galls - Eriophyes parulmi?
Identical galls are pictured from elm in this book:
Keifer et al., 1982, An illustrated guide to plant abnormalities caused by eriophyid mites in North America. USDA ARS Agriculture Handbook 573.

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