Re: Johno's Easy Vap - Vaporizer
The 5x5 treatment allows the least number of mites to reenter the cells to continue the cycle. Once per week is effective at control, but not eradication. I use the weekly program due to work and have managed to stay on top of the mites for the hives remain healthy. During fall foraging, more mites are coming into the hives, so treatment is never a one and done affair. The late Nov and Dec treatments drops the mite levels to zero for the spring buildup.
There is no evidence yet to suggest mites are able to develop resistance to OA. But to be safe, it is recommended that various treatments be used periodically.
Thankfully, the bees are smarter than I am. They are doing well, in spite of my efforts to help them.