Larvae pupate inside the bud and molt to adults in about 10 days. Overwintered adults may still be laying eggs as late as mid-May, when the first summer adults emerge from the buds. Summer adults readily fly a considerable distance. They feed on the pollen of various weeds. Some weevils overwinter in cultivated host plantings, but most winter in adjoining weeds or woods.
Parasitism can be extensive, but it occurs after clipping injury so the damage is already done.
A tentative action threshold similar to that used for strawberries is suggested for blackberries. Scout two to three times weekly for bud stem cutting to catch infestation early. An insecticide can be applied just after bloom.