Long discussion on similar problem on taking bees to an area that was presumed to be free of Varroa.OA vape, about 5 days after capture. I'm sure Varromed will work too, although I have not tried it.
If broodless only one OA treatment is requiredLong discussion on similar problem on taking bees to an area that was presumed to be free of Varroa.
Considered opinion was to shook swarm bees onto fresh foundation and then give 3 OA vaporisations....
Remember that when a swarm leaves the hive, most of the varroa are in the sealed brood rather than clinging to adult bees.
Not sure about most of the varroa being in the sealed brood. This study found the figure to be 36%
Absolutely, I've also read advice to discard the first frames of sealed brood to get rid of the mites, I can't think of anything worse for the development of a swarm, that first brood is the engine that drives it on, built on the unique physiological change in the bees prior to swarming designed to produce that first flush of brood in good order.Your best bet for treating is a vape a few days after capture. Seems carry varroa and in some instances a lot, I’ve had some over the years almost collapsing after getting established in very short order.
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