My oxalic acid came in on Friday, so I mixed up a liter of 3.5% solution today.
I went out to the hives, and there was plenty of brood. I saw quite a few larvae when removing burr comb, and I saw no mites. So maybe I didn't need any oxalic acid after all, which is just as well, since it's too late to treat.
Happy Pentecost.
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