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Raspberry Fruitworm, Byturus unicolor (Say) (Coleoptera: Byturidae)

Distribution

Raspberry fruitworm is distributed throughout the eastern United States wherever raspberries are grown.

Biology

Adult beetles are yellowish brown, hairy and about 8 mm long. Adults lay grayish-white eggs on swollen, unopened blossom buds, which may be deposited at the base of the developing fruit. Eggs hatch into larvae within a few days, and the emerging larvae feed on the developing fruit for 5-6 weeks. Larvae pupate in the soil inside of a cocoon. Raspberry fruitworm overwinters as an adult, and emerges the following year when blossoms begin to develop.

Damage

Raspberry fruitworm larvae feed on raspberry receptacles, causing berries to dislodge from the plant stems. In some cases, larvae feed on internal tissues of immature berries. Adults feed on blossom