I've heard some reports of insect problems in storage bins containing 1995 small grains. Considering the warm humid weather that we had this year, insect problems aren't too surprising.
Insects thrive in warm, humid conditions.
Fumigation is sometimes used to kill stored grain insects. It involves sealing bins and applying a chemical that releases toxic gases. If the fumigation is done properly, it can be effective at killing all insects in the bin. Fumigation might not be the best option, however, especially at this time of the year. For one thing, some fumigants cannot be used at low temperatures and some cannot be used on grain that will be used for seed or malting purposes.