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Conventional "wisdom" used to be that colonies in the north are broodless in December, making them prime candidates for varroa treatments most effective during broodless conditions, which is all of them, I know
Traditionally, OAV is applied around the winter solstice in December. Lately, I see people stating northern bees are broodless in October-November, which would suggest changing the timing of OAV by at least a month. Any input on when winter broodlessness is for northern US and lower Canada?