They remain in the soil for one to two years before emerging as a new adult weevil to repeat the process.Ĭontrol of nut weevils in backyard oak and hickory trees is not practical. Outdoors, these larvae tunnel into the soil to complete development. Larvae or grubs are legless, creamy white and have reddish-brown heads which grow to 3/5 inch long. The fully-grown grub chews a perfectly round 1/8 inch hole in the side of the nut and emerges in late fall or early winter. Common Name: Pecan weevil Scientific Name: Curculio caryae (Horn) Order: Coleoptera Description: Adult pecan weevil adults are 3/8 inch long, brownish beetles with snouts as long as the body. The larva grows to 1/4 to 3/8 inch in length as it eats the entire contents of the nut, making it worthless. The egg hatches into a creamy white, grub-like larva that feeds inside the nut until fall. The female adult weevil lays her eggs inside the immature nuts. Nut weevils attack the developing nuts on the tree during mid summer. In some species, female snout may be longer than the body (never in males). The most common are closely related weevils collectively referred to as “nut weevils." The word 'curculio' is used in common names of a number of weevils belonging to other taxa, sometimes other families. There are several species of insects that live inside nuts and acorns. This is the exit hole created by the pudgy, white, wrinkled, legless grub that developed inside the nut. If you spend any time at all picking up hickory nuts or acorns in the fall you have probably noticed acorns and nuts with a neat, small round hole through the side.
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