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The Oak Besma (''Besma quercivoraria'') is a moth of the Geometridae family. It is found across southern Canada (from Newfoundland to British Columbia) and all of the United States except California. Adults are sexually dimorphic. The wingspan is 27–41 mm. Adults are on wing from April to September in the south, from May to August in Ontario and from late May to July in Alberta. There are two generations per year. The larvae feed on the leaves of oak, elm, poplar, willow, ''Picea glauca'', and mostly ''Betula papyrifera'' in southern Canada. ==External links== *(''Besma quercivoraria '' ), BugGuide *(Images ) *(Species info ) *(Moths of North Dakota ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Besma quercivoraria」の詳細全文を読む スポンサード リンク
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