Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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.[The wingspan is 13-14 mm. There is one generation per year.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.
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