I found a colony of wild bees in a hole in a tree. Not far from mine. Way busier than mine to, typical. So i think its a good size, dont think its robbing, but there are some fighting and wasps, but not enough to alarm. Question is should i, and how can i treat them for varroa? Dont want them dying and i dont want mine robbing and bringing back varroa or AFB I was going to put a wet towel over most of the hole, about the size of a football and poke the OA vaporizer up there and hope. Cant get to the nest as its well up inside the tree. Any other ideas?