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Identification
Small brown-mottled moth; pale green-yellow larvae mine and feed inside leek, onion, and garlic leaves.
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Life Cycle
Two to three generations per year; overwinters as a pupa in plant debris or nearby vegetation.
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Damage Signs
Larvae tunnel through leaves and into bulbs, causing ragged windowed patches, leaf collapse, and rot entry points.
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Treatment
Remove and destroy affected leaves and larvae. Cover crops with fine mesh during moth flight periods.
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Prevention
Rotate alliums and clear old plant debris where pupae overwinter.