The snout is longer than the body on the females and slightly shorter on the males. Eggs are white and are laid inside the developing pecan nuts. Larvae are creamy white, legless grubs with reddish brown heads. They have four stages and when full grown are 0.35 inch long. Pupae develop underground and are seldom seen.
Pecan weevils cause two types of damage.
When they emerge from the soil in August, they puncture nuts. This feeding causes nuts to fall in 2 or 3 days. 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.