These species can be a problem in the production of oak trees from seed. Adult and larval acorn weevils are similar in appearance to pecan weevils and often occur around homes surrounded by oak trees. Larvae and pupae become common in flower beds and gardens in which acorns have fallen. Larvae pupate in late summer or fall. Adult weevils become active in August and early September.
Mated females chew a hole in the pecan shell and deposit eggs inside.
They burrow into the soil and construct a cell where they remain for 8 to 10 months before pupating and transform to adults, although some larvae do not pupate and transform to adults until the following year. Adults remain in cells and emerge from the soil a year later. The entire life cycle takes 2 or 3 years. Mouthparts are for chewing. In most years, larvae damage results in the most yield loss.