Weevil Infestations
Adult female weevils chew a hole in the kernel, lay an egg and seal up the hole. Meanwhile, the eggs hatch and over the next few months, the young larva feed on the interior of the kernel, eventually emerging as full-grown adults. Always inspect all grains upon purchase, freeze grains for at least a week to kill any eggs, buy grains in small quantities that you will use in a reasonable period of time, and always store grains in tightly sealed glass, metal or plastic containers (not bags).