>
>You have to wait until the colony is brood free in the fall in order to
>get good results (95% mite kill). If the mite load is already high in
>august, the winter bees might need an earlier treatment in order to be
>healthy and make it through the winter as a good strong colony.
>
>This written from Stockholm, Sweden. Climate similar to nothern US states
>and carnolian bees (little brood after sept 1st).

>/Mats Andersson


  I keep bees in the Northern US, 12 miles from the Canadian border. Our
broodless period never starts in September. Most years the queens shut down
about mid-October, and in warm autumns, I've seen queens laying into
November. Treating this late would certainly be a problem here. Varroa
counts are high by this time of the year, and I would think many colonies
would crash. You mention treating twice, once in August, and once when
brood-less. I read the NZ use of Oxalic that Allen posted awhile back. They
say not to treat more that once.

         Have you treated twice and had good results, Mats? Did treating
twice have any bad effects on the bees? How did the colonies treated twice
winter?

Mike

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