On 1/13/2012 1:55 AM, Stan Sandler wrote:
> I would be grateful for more accounts of how people are finding their bees
> react to multiple treatments during times of the year when bees are NOT
> broodless.
>    
  In 2004 I began using the Heilyser oxalic vaporizer. Treated the bees 
in mid-November, and saw average mite levels the following May. By 
August, 2005 some colonies were in trouble. I vaporized again that 
November, and saw high mite levels in May. By August many colonies were 
in trouble. I called Heilyser and said their vaporizer and the oxalic 
weren't controlling the varroa population. He told me to vaporize three 
times, seven days apart. I spent the month of September vaporizing my bees.

First did an alcohol wash. Mite numbers were 15-25 approx. Vaporized 
that day and twice more at seven day intervals. Then waited seven days 
and did another alcohol wash. The mite numbers stayed the same or went up.

Before the first vaporization I marked frames of eggs, larvae, and 
sealed brood. At the second wash I looked at marked frames. I could see 
no brood damage or break in brood rearing. I also didn't see any mite 
control.
Mike

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