>
>
> >I use single brood boxes as is common here, and screened bottom boards
> open to the ground which is not common. Jean Chapleau of Apinovar from
> Quebec told me that the cool temperature at the bottom of the brood chamber
> favoured varroa development over that of the bees.
>

Varroa reproduces better at cooler temps--the mite is adapted to best
reproduce in drone brood, which is typically held at a lower temp.

>
> >I have also found that late springs, as we are experiencing in 2019 (very
> few trees in leaf today with none in full leaf), result in very low mite
> levels in late August
>

Across the board, a shorter winter means that there is less of a brood
break, and thus are typically followed by higher mite infestation rates
later in the season.


-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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