Finman are you saying that Oxalic acid is the only varroa treatment you use ?Diseases are serious issue. After 47 beekeeping years, I do nothing my own against varroa. It has surprised me couple of times and it is expencive.
I would agree here. We dusted and got a few - enough to prove that we had to worry about varroa. Now that we are using apigard, we have loads of dead mites on the OMF boards.It dropped a few mites. He then treated with thymol, and the large number of mites that fell showed the garlic/sugar treatment numbers to be insignificant.