How to they handle grasshoppers in swarm? With a swarm of a few million on the move they can graze 12 acres to stubble in an hour. Caterpillars can also do grea

How to they handle grasshoppers in swarm? With a swarm of a few million on the move they can graze 12 acres to stubble in an hour. Caterpillars can also do great harm. There are natural effective insecticides, like natural pyrethrins or nicotines - do they work well enough? Weeds? There are very few natural weed killers - hank pick? Robot machine weed picking is getting better and better.