My new hive is just 3 weeks old. I started noticing some curly wings on 3-4 bees each day recently. I see an occasional varroa mite on these, esp. drones, so I guess it's time to dust.
I read on Michael Bush's site that powdered sugar should *not* be dusted when it's too hot outside or it can kill the bees. Here's the quote:
"It is also very temperature sensitive. Too cold and the mites don't fall. Too hot and the bees die." -- http://www.bushfarms.com/beespests.htm#varroa
What is too hot? Should I do it in the evening when it's cooler?
FYI: Right now it's 92*F with high humidity. Next week will be even hotter and drier.
I have put a sticky sheet beneath my sbb to get a 24 hour baseline count.
Until now my sbb has been open air, but 200 bees have been bearding under there every day for weeks. I had to brush them all off today to put the sticky board in.