Re: Oxalic acid vaporizer
David, there is no defined treatment schedule per se. Most people agree that three or four treatments five to seven days apart will get the job done. Mites reinfest hives so you have to do follow up treatments throughout the fall. I do a single application and count dead mites. If there are less than 20 on all the hives, I won't do a second application. But if numbers are higher, they get it every couple of days until the drop numbers come down. I consider the apiary as a single unit so even if 1 out of 20+ is high, they all get treated. My supers came off two weeks ago and I am starting my first round of OAV this weekend.
Thankfully, the bees are smarter than I am. They are doing well, in spite of my efforts to help them.