I’m currently treating my hive with Oxalic Acid vaporization to knock down the varroa mite counts which are pretty high. I tried to lay the vaporizer on a piece of plywood and put the vaporizer and plywood into the corflute slot to keep the fumes inside the hive. They fit and there is space between the vaporizer and the screened bottom board. However, the Oxalic acid (OA) won’t vaporize. It just pops out of the vaporizer tray onto the plywood. But, when I do a test with the vaporizer on the plywood out in the open, it vaporizes just fine. What am I missing here? Is there some sort of reaction the OA is having with the screened bottom board? Is it not vaporizing due to a lack of oxygen? I am plugging the opening with towels.
Alternatively, I could put the vaporizer directly into the hive opening, but I’m concerned about burning bees. Does anyone have experience doing it this way? It seems the more common way to do the vaporization, but I’d like to minimize the risk to the bees if possible.