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
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
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012