Petiole Galls occur periodically in strawberry fields, especially near weedy borders. One or more galls may occur per petiole. The greenish to reddish galls are 1 to 4 inches in length and somewhat segmented in appearance. Galls have 10 to 35 or more central chambers inside, each containing a small single white larva. The causal insect is not known.
Petiole galls appear to have no serious economic impact on the plants. Removal and disposal of affected stems may prevent further attack by the causal insect.
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