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M I did find the thymol treatment was effective, but to stop the laying in August for 3/4 weeks was just too long for me in this area, if the count is shown to be low in spring as opposed to what I suspect, which is that there is brood in the hive and the V are in cells, I would consider just using a single FA treatment and drop the winter OA
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finding low counts of varroa after the OA treatments, possible not worth all the bother of a winter treatment, but go with the August treaments only
Certainly give the poor old queens a break from multiple chemical doses
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Senior Member
I have had queen live to the 4th season which were treated with Oxalic every winter.
It does not seem to do them any harm in my experience.
One of my colonies dropped over 300 mites with Oxalic treatment.
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I swapped an old queen I'd breed from into a 5 frame nuc last august. she arrived in 2012 and been doing quite well so I thought I'd give her a chance but she was looking very arthritic this august she was still there at las check the record show 5 OA and 2 FA treatments.although she is my oldest Q post varroa she doesn't look well worse than I would expect pre treatmments
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