Spray for bugs on outside of bin. Spray concrete, walls as high as you can reach, 6 feet out from bin, into fan, into unload auger. Spray about every 6 weeks during the warm season. Almost every time that I forget to do this there is bugs in the corn on the floor next to the wall, when storing corn from Sept to August.

I know of someone that stored corn from 2016 until spring of 23. The quality went down but it did still flow.