Reference Work Entry

Encyclopedia of Entomology

pp 3410-3411

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


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


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.


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 and foliage but rarely cause significant damage. High populations of adult fruitworm may result in characteristic longitudinal holes in the foliage.

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