And where you got that calculation?Yes it's the most important thing, otherwise 80% of varroa will escape. But if you only treat 75% of the bees then 25% of varroa will escape too.
It's only an estimate. Some bees not in the gaps. Some bees moving all over the place. Some bees shield others but move away after the acid is applied. So maybe 25% don't see the acid?And where you got that calculation?
why i shoud i treat only 75%
i use to treat them all
you trickle every gap where are bees and that's it.