Weevils and Borers. A County Agent's Guide to Insects Important to Agriculture in Georgia. Univ. of GA, Col. Ag. Ctr., Jan. 20, 1999. Larvae are small, white, legless grubs usually found in stored grain.
Adults also feed on flour.
Overwinter as adults or larvae. Adults can survive zero weather for several hours. Females chew small holes into grain kernels, lay 300 to 400 eggs over a period of months, one egg per cavity, and seal each oviposition hole with a plug of gluey secretion. Eggs hatch in a few days and larvae feed in and destroy the interior of the grain. Pupation occurs within grain kernels.