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Typical symptoms:Leaves of leek and onion develop whitish brown patches where caterpillars are feeding within the leaves. Young caterpillars tunnel into the leaves; older caterpillars tunnel down into the stem and bulb causing extensive damage. Secondary rotting occurs within areas of the stem causing parts to become brown and slimy. As damage becomes more extensive, leaves start to turn yellow with brown patches. Silken cocoons on the leaves may contain brown pupae.