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Cranberry Fruitworm

Size: 10–13mm (larva)

Identification, life cycle, damage signs, and treatment guide.

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Identification

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 Signs

Larvae bore into fruit and feed internally, webbing several berries together with silk; infested fruit turns premature red and drops.

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Treatment

Remove and destroy webbed, infested fruit clusters. Time insecticide sprays to egg-laying period if infestations are severe.

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Prevention

Rake and remove mulch and debris beneath plants in autumn to eliminate overwintering cocoons.