Around here in NB a 'final' treatment in early winter when broodless is stressed, but I always wonder about the efficacy of treatment when they're clustered.  I am sure the remaining mites are in the middle of that cluster.


Not really a problem if you use a bit of common sense ( not insult intended)  a fair 40/50deg day is fine.  Its already a loose cluster,  and your blowing in 350 air (yes it cools quick)  so loose clustered bees quickly expand and move the OA around the hive (yes I have checked)  good penetration is not a problem.
  Been doing it in late NOV in my area for about 10 years now??    Nice cool 45 degree fall days.

As for midsummer treatments,  returning foragers are only blocked for a minute or two,  so its not a big deal.  I block them longer parging the truck next to the yards!  
It always amazes me they cant figure out a way around the truck!





Charles

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