The maize weevil and its relatives develop inside whole grains. Indian meal moths feed externally on intact and broken grains. Red flour beetles and other insects feed on broken kernels and fine particles. Use a grain trier to sample for the presence of insects. Probe traps can be inserted into the top layer of grain for 1 to 5 days to detect insects.
Pheromone traps are available for Indian meal moth and other insects.
Read the fumigant label carefully, and follow the instructions provided. Any of the above grades is classified as infested if more than two stored-grain pests are found in a 1000g sample. 0.2 percent 5 percent 3 percent U.S. No. Table 4 . Seal all unnecessary openings before loading the bin, and seal the aeration fan, top vents, eaves, and anywhere else you can see light coming through the bin.