Treat For Varroa Mites Johno's Easy Vap (Oxalic Acid) YouTube I like to treat my hives with OAV at least once a month during winter when the temps hit the 40s and I see some activity. I use a Johnno's easy vap vaporizer. 15 hives took less than 30 minutes. Thank Instantvap 18V Original Oxalic Acid Vaporizer Milwaukee M18 Compatible JohnDow JDI 20COMBO 20 Gal Combo Fluid Evacuator & Oil Drain
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