noun
small black sawfly native to Europe but established in eastern United States; larvae mine the leaves of birches causing serious defoliation
• Syn: ↑Fenusa pusilla
• Hypernyms: ↑sawfly
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noun : a small black sawfly (Fenusa pusilla) native to Europe but now established in much of eastern No. America with a larva that mines in the leaves of various birches often causing serious defoliation
Useful english dictionary. 2012.