Where I live in Barataria ,La a small town 30 miles south of New Orleans,we are sprayed daily, by trucks that go up and down every street in town.We also get sprayed from the air about 3 times a week.
I have one hive in my yard about 70 feet from the road that is sprayed daily,I don't know if it is hurting them,they seem allright,but I suspect it has got to be doing them harm in some way.I have the rest of my hives south of town at a hunting camp that is accessible only by boat,they are affected by the areal spraying only.I see no harm in them, they are good honey producers.
We have been sprayed for mosquito's around here for as long as I can remember,when we were kids in the late 60's early 70's we used to ride our bikes behind the spraying trucks up and down the streets,we called it "chasing the fog machine",(no wonder we're all brain dead).
Maybe from being sprayed so long the bee's have some kind of immunity, they seem outwardly to be allright,and we have plenty of feral hives around.This whole area including the New Orleans area and it's suburbs have had intensive mosquito spraying every year sense the early60's ,I'm not a scientist, but the bees seem to be OK.(Look at the bee's JP deals with from the same area).
Mike