window feeding

Damage to a leaf, caused by a larva that locally consumed all leaf tissue except either the upper or the lower epidermis, leaving a conspicuous, very transparent “window”. Window feeding can easily be mistaken for a mine; see the little chapter about “pseudo-mines

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window feeding on Annual Mercury

Adscita statices larva

especially in fresh feeding traces the thickness of the leaf is visible as a sharp line at the border of the “window” (window feeding Adscita statices on Rumex acetosella)