My bees seem to have some evidence of deformed wing virus - not lots of bees with it, but it's definitely there. HOWEVER, my varroa count is pretty low - it was at 2 a day at the end of March, which seems like it should be a tolerable level from what I've read. I treated with thymol this spring, despite the low-ish count, and have a super frame in place for drone which I'll remove - they're ignoring it just now though.
The only thing I can think of is that my count at the end of March was off, and it was it too cold for the thymol to work - I removed the second tray on Saturday as it was empty, and figured that if it was empty then it must have been warm enough for it to evaporate therefore must've been OK. I've put a floor insert in yesterday to count varroa again. Is this the right thing to do?
All advice very welcome!