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. Adults can be sampled with emergence traps in the soil or with a beating sheet. Larvae feed in developing pecan nuts, causing yield loss. For additional information, contact your local Texas extension service agent, or search for other state extension service offices. Holloway et al. 1984.