madapiarist

They might look similar, but they are not. Hives are graded and a 4 or 5 framer nuc wouldn't make the cut. Growers don't buy bees for pollination, they rent them. And yes, they are sometimes damaged by careless pesticide application.

That's a temporary nuc box for live bee sales. Noone takes these to pollinate crops. Once they are done pollination, the grower might not care anymore, but the beekeeper certainly does. They either move on to another crop or return home to produce honey.