Just a follow up on TF hives and varroa on the boards. I won't be treating but any related observations from people who have done the same welcome.
I have asked around and decided 50 or under is fine and am there, details below. May be of use to someone looking for this sort of info anyway.
Hives have been dropping a steady 20-30/day all year, seems fairly consistent as this is a sticky count so gives an indication. Latest today gives an increase to 26 and 30 / day over a 3 day period.
The two hives always have the same ratios but the bees are different and have different behaviours. I am in central france and after a couple of rainy days sun is out and bees going mad bringing in pollen.
The busier hive that drops 20 or so is now 30 / day but they were shut in for a day, then dull but still busy, today going absolutely mad. Pushing and shoving to get in the entrance. Also pupa on the board look about 12 days old (assume more dumped outside). These are slightly italianate local bees.
The 'steadier' one is blacker bees and is always busy but not so frantic, I think they are full and ready for winter. Normally 30 / day now 26 and one pupa but then they are inside more.