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Photo#463894
canada thistle stem galls  - Urophora cardui

canada thistle stem galls - Urophora cardui
Warren Twp. , Somerset County, New Jersey, USA
Size: range from 4-5 mm
I kept some in a sealed bag indoors, and now, a week later, many seem to be pupating.

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canada thistle stem galls  - Urophora cardui canada thistle stem galls  - Urophora cardui canada thistle stem galls  - Urophora cardui canada thistle stem galls  - Urophora cardui