After reading the fine print: "Oxalic acid vapors only kill the mites that are on the bees (phoretic,) not in the brood." you mite want to consider formic acid.
80% of the mites are in the brood, so you should not anticipate stellar results with oxalic acid at this time of the year.
100% agreed, I have even tried treating every 5 days for 4 treatments, and am disappointed at the results with Vapors.
I treat when broodless and have great success then.
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