Re: BWrangler Update
In my country spraying contractors are required to take extreme care around beehives and could be in serious trouble if they sprayed some.
Malathion would have had to be part of the cause. It is a residual OP that may remain active on a painted surface for several months. There is no way it would not have affected your bees.
Anyhow, to pick up on something else you said, what is slow motion CCD? Is it a recognised condition?
44 years, been commercial, outfits up to 4000 hives, now 120 hives and 200 nucs as a hobby, selling bees. T (mostly).