I put two hives at a friend's house last year, and added two more this year. This morning he called me up and told me they were "booming" and that I should come over to see. I drove over and as soon as I stepped out of my truck I smelled insecticide. We had talked about the importance of not spraying, but he had done it anyway. He didn't even know what it was, just "something for lawns", but he "didn't go near the hives". We walked over to look at them, and there were thousands of dead and dying bees around the entrances. Bees kept falling out, squirming around for a few minutes, and dying. I opened three of the hives, there were a few live bees but not a lot. This is incredibly depressing.