What did people do before we had all of these convenient chemicals?
It's widely reported that the decline of game birds (quail and pheasants in this state) is the direct result of habitat loss.
Habitat loss is clean farming. Clean farming is plowing under everything every year and spraying chemicals on everything else. The loss of fence line vegetation (chemical sprays) is one factor in the huge decline of upland game birds.
I know this shit because I used to hunt pheasant and quail a lot. In the 50-60's before we had chemicals and clean farming practices in Yakima Co, WA there used to be pheasants in every field, lots of pheasants. Now F&G has to plant pen raised pheasants every year. If they didn't there wouldn't be any birds to hunt.
Just another downside to using chemicals to kill vegetation.