"Bee"Line,
How 'bout a bee Id?
I doubt the aggressors are honey bees, carpenter bees, bumble bees
or most wasps...I'd guess the hornet specie(s), which can be benign
or, damn agressive and mean.
Esp. the "ground hornets", a kind of yellowjacket actually.
They tend to coop in rock work/ground holes, etc. If you find
their lair, (watching them constantly fly back to their den), blast
them after dusk when they are all cooped for the evening.
Some nuts use gas, (just the fumes do them in), though dusting
sprays,eg DrioneDust, is the rec'd...
http://www.pestproducts.com/drione_dust.htm
You knock off a few ground hornets nests and you will be pretty
free, imo.
GL,mD