If you are concerned with insects in your wheat berries, there are two effective methods to kill bugs. Either freeze the grains for 96 hours or store wheat berries with oxygen absorbers. We prefer the oxygen absorber method because it is more effective and time efficient. Insects cannot survive without oxygen, so placing oxygen absorbers in an airtight container will kill all the insects within two weeks. Related Article: Oxygen Absorbers vs. Silica Gel Packets