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Identifying cranberry fruitworm on Cranberry
Small brown moth; green-brown larvae web together and hollow out berries in cranberries and blueberries.
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Life cycle
Single generation per year in most regions; larvae overwinter in cocoons in soil or mulch, moths emerge as fruit begins to set.
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Damage to Cranberry
Larvae bore into fruit and feed internally, webbing several berries together with silk; infested fruit turns premature red and drops.
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How to treat cranberry fruitworm on Cranberry
Remove and destroy webbed, infested fruit clusters. Time insecticide sprays to egg-laying period if infestations are severe.
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Preventing cranberry fruitworm on Cranberry
Rake and remove mulch and debris beneath plants in autumn to eliminate overwintering cocoons.