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Use an oxalic acid vaporizer with caution

A friend and master beekeeper from Connecticut, Bill Hesbach, wrote the following account about his misadventures with an oxalic acid vaporizer and a face mask. First posted on BEE-L, the story is a cautionary tale of the hazards of working with oxalic acid, and a reminder that when things begin going south, they sometimes just […] Read more

Using oxalic acid vaporization when brood is present

A reader wrote that she was confused about scheduling oxalic acid vaporization treatments when brood is present. Some folks advised her to use three treatments five days apart, another advised three treatments seven days apart. She wants to know which is best. I think the big question here is how long after a treatment does […] Read more

Prevent resistance to miticides: rotate your treatments

Last week I reminded readers that an oxalic acid dribble was a viable alternative to vaporization. I also said that, personally, I was unwilling to purchase and store all the paraphernalia that is required, such as the vaporizer, 12-volt battery, and respirator. After all, I keep a small apiary that never exceeds 15 hives. For […] Read more

How to apply an oxalic acid dribble

Oxalic acid as a Varroa treatment first caught my attention two years ago when beekeeper Mark Luterra showed me a photo of his bottom tray after treatment. What an incredible display of dead bodies! I was intrigued. Later, I followed up with some research, mainly from Randy at ScientificBeekeeping.com. From him I devised a treatment plan […] Read more