In message <001601c28df2$78d210b0$2ed3ad8e@HAL>, Donald Aitken
<[log in to unmask]> writes
>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.
Mites enter the cell in the day before capping, so mites spend 13 days
in worker brood and 15 days or so in drone brood. Older mites enter a
second or third cell to breed whilst new mites spend several days
maturing before entering a cell for the first time. These phoretic mites
have a longer period with the strips, the mature mites have a couple of
shorter shots.
--
James Kilty