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Cranberry fruitworm
Rufus Isaacs, MSU Entomology
Adult moths emerge during bloom, and monitoring traps can indicate timing and abundance of male adults. Females begin to lay white, oval eggs in the calyx of berries soon after petal fall, and eggs turn yellow as they develop.
Cranberry fruitworm moths have distinctive white patches on their wings.  

Larvae typically bore into berries at the stem end, making a hole with frass around it. Larvae are green with a dark head. They move between multiple berries as they develop. Berries in a cluster are webbed together, and frass is often deposited. It looks like sawdust trapped in the webbing.

CBFW eggs are oval and irregular, changing from white to yellow as they age. The egg on the left in the photo above has hatched. Larvae enter fruit where the stem meets the berry.
Jerry A. Payne, USDA ARS

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Last Updated - 6/22/07