>W. Allen Dick writes of possibility of checking bees on honey house window
for mites.
   If your eyesight is good, and you have good light, you can see varroas on
adult bees. You can train your eye, just as in finding queens. The smooth
shiny brown color stands out against the fuzzyness of the bees
   Varroa prefers brood, but there are always a few on adults too. When I
find a wild hive, if I can get to the entrance, I like to check the adults.
I've seen workers return to the hive with a varroa piggybacking, apparently
having ridden the whole distance. -Works best in sunshine.
[log in to unmask]   Dave Green