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Date: | Tue, 18 Oct 2011 15:34:48 -0400 |
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>... In a natural drop, if brood is present, about half of
>the mites that drop are ones coming out of emerging brood, that would not
>survive for more than a few hours (Lobb 1997 Mortality of Varroa jacobsoni
>Oudemans during or soon after the emergence of worker and drone honeybees,
>Apidologie 28:367).
That is good information. We sorta know that by looking at dropped mites,
but it is nice to have an authority look at the question.
(Going off-track for a second: Another thing of that sort that I cannot get anyone
to comment about is that when comparing dead mite counts under cappings in
formic-treated hives with dead mite counts under cappings in controls, we
notice that there are significant number of dead mites under cappings in
non-treated hives. What causes that????)
>... What I was saying was that
>the accelerated drop caused as many mites to fall, as natural drop would in
>6 days. This wasn't meant to imply that 34% of actual, viable phoretic
>mites drop in 6 days.
OK. If we accept that almost half the mite drop over six days will be non-viable
mites that were not part of the phoretic population at the moment of treatment,
then tonaturally drop a number equal to 34% of the phoretic population number
over six days, we would have see a drop of roughly 34/6~=6% a day.
Even if half that 6% were non-viable mites emerging during the six days, that
would still require a daily natural drop of around 3% of the total mite population.
That seems high to me under most conditions.
What am I missing?
>Wow, you are right! I've given ppt presentations with step by step photos
>so many times, that I thought that I had put them into an article. I will
>try to get them onto my site (I'm sending you a ppt of them).
Thanks. Very instructive.
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