The second type of damage is larval feeding within the nut. At maturity, the larva chews a circular hole through the shell and exits. The life cycle of the pecan weevil consists of 4 stages and can span 3 years. Adult weevils emerge from the soil from August through September. Often a rain of 1 inch will trigger emergence.
Adults crawl or fly, mate and live for many days.
Females drill holes into nuts and lay eggs. Larvae pass through 4 stages feeding inside the nut. Nuts drop to the ground and larvae exit. They burrow into the soil where they remain for 1 or 2 years. They pupate and change into adults about 3 weeks later and remain in the soil until next August.