I attempted an oxalic dribble in the fall on three hives. Due to the light weight of the crystals, I had to use a gunpowder scale to get the right accuracy.
Scientific Beekeeping mentioned using a water-only base for the oxalic. Another article suggests treating package bees initially. This makes sense in that they’ll be carrying phoretic mites and the number can be drastically reduced if treated prior to the development of brood.
One paper describes using oxalic and thymol together. I was more interested in the dosages mentioned.
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