these treatments are most effective when delivered during a broodless state.
THAT CLAIM IS FALSE. It is 20 y old methiod and very laborous and even dangerous to beek.
Oxaclic acid trickling takes 30 second to execute. Inner cover off and inned cover back.
USA is 15 years behind Europe in mite treatments. No one can help you there.
in spring brood brake comes from lack of pollen. Nothing else.