You would not believe how hard the "no pests" thing is in real life. It only takes a few insect eggs to start an infestation. It is hard enough to do that on a

You would not believe how hard the "no pests" thing is in real life. It only takes a few insect eggs to start an infestation. It is hard enough to do that on a "sack of grain" scale, let alone on industrial farm scale. Only way AFAIK that pest infestation are successfully forestalled in large food storages are through refrigeration or inert or even toxic atmospheres. Both of these will not work if you are actually trying to produce food.