Our ID Notes may contain important tips necessary for distinguishing this gall from similar galls and/or important information about the taxonomic status of this gall inducer.
The plant-feeding gall midges of North America
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Tapered stem swelling...Lasioptera ziziae Felt
Swellings are about 4 cm long. Larvae overwinter in the stems, and adults emerge in spring. Host: Z. aurea. Distr.: Illinois.