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Husks of walnuts damaged by walnut husk fly cannot be removed cleanly from the shell (right), but the nutmeat is not damaged (left).

Two walnuts damaged by husk fly, one with husk removed to show stained shell (right) and one cracked open to show undamaged nutmeat (left). Credit: Jack Kelly Clark
Husks of walnuts damaged by walnut husk fly cannot be removed cleanly from the shell (right), but the nutmeat is not damaged (left). Credit: Jack Kelly Clark
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