Hi Chris:

I am interested in finding out why everyone believes that leaving the strips
in over winter would produce resistant mites. Perhaps the manufacturer could
point us to any studies that were done to establish the recommended 42 day
application period. It would appear that it is more to ensure that two
rounds of brood are treated than to discourage resistance build up. Since
drones take 24 days to emerge, and are the favoured brood for mites, one
would think that 48 days would be a better choice.

                                    Best regards



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