> On 6 May 2019, at 1:14 PM, randy oliver wrote
> Inside the hive, environmental temperature and humidity are typically kept fairly constant--the outside environment has little effect upon these parameters.  And although varroa is less heat-tolerant than the honey bee, in our own operation, run in 100F temps in dark boxes, we don't observe
> that the high temps reduce varroa buildup.
> 
Hi Randy & All

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.

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

Bob Darrell
Caledon Ontario
Canada
44N80W

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