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The Birch Leaffolder or Yellow Birch Leaffolder Moth (''Ancylis discigerana'') is a moth of the Tortricidae family. It is found in north-eastern North America.〔(Bug Guide )〕 The wingspan is 13–14 mm. There is one generation per year.〔(Biology of Ancylis discigerana (Lepidoptera: Tortricidae) )〕 The larvae feed on ''Betula alleghaniensis''. The first two instars skeletonise the lower surface of a leaf of their host plant. They feed from beneath a sheet of silk that is constructed between two lateral veins. Third instar larvae move to the upper surface of a different leaf and fold it lengthwise. They then feed on the upper epidermis within the fold until the leaf falls down. ==Gallery== Image:Ancylis discigerana damage.jpg|Damage Image:Ancylis_discigerana_damage1.jpg|Damage Image:Ancylis discigerana damage2.jpg|Damage Image:Ancylis discigerana damage3.jpg|Damage 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「Ancylis discigerana」の詳細全文を読む スポンサード リンク
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