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.
Plant Parasites of Europe
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GALL
numerous, ± 1 mm large, pale green to reddish pustules, up to 100 on leaf. After the wasp has vacated the gall, a conspicuous opening remains in the top. Two or more generations.