> I will cut off some capped comb, freeze it, and tell you what I can see 
> inside when I have time.   Which are the bets? Lots of varroa per cell?

I really don't know.  I've wondered about this a long time.  Recently, I 
noticed that Max Disselkoen ( http://www.mdasplitter.com/ ) claims that all 
the mites rush into the first cells after a broodless period and kill the 
larva and themselves. by doing so.

That is in summer, though.  Personally, I have doubted this, but have long 
wondered about what happens after the broodless period in winter when only 
small patches of brood are started and maintained for several weeks or more. 
What happens in this timeframe could be very significant.

> The varroa is been sampled out of the outer cluster bees.

When  there is brood, it has been shown that higher counts are found near 
the brood.  I don't know, though if this applies in winter.

I have been trying to make sense out of what Juanse posted and I have 
re-organised the table that got jumbled by the email.  One of the two 
versions below should look good to most readers.

Here is the table arranged for verdana-type fonts:

          Population                   Nosema Spores       Varroa
     Frames of Bees                B4   After   After    V60         V300
     Mar    Jul     Mar    Jul     Mar   Apr     Jul   Count&    Count&
      (s)      (s)      (p)      (p)                                 Percent 
Percent

O   7.5     5.0    5.93   4.45   446   21    3.8   5.8=10%   13.5=5%
F    7.4     4.5    6.18   4.35   418   33    2.9    1.6=3%      7.3=2%

O=oregano (n=40) / F=fumagilina (n=40)
s=sampled (10%) / p= whole population
V60=varroa sampled out of 60 frozen bees
V300=varroa sugar shaked out of 300 bees


Here is the same table arranged for fixed-width fonts:

          Population               Nosema Spores        Varroa
  Frames of Bees                 B4  After   After    V60    V300
   Mar      Jul     Mar    Jul   Mar   Apr    Jul   Count&   Count&
   (s)      (s)     (p)    (p)                      Percent  Percent

O   7.5     5.0    5.93   4.45   446    21   3.8   5.8=10%   13.5=5%
F   7.4     4.5    6.18   4.35   418    33   2.9   1.6=3%     7.3=2%

O=oregano (n=40) / F=fumagilina (n=40)
s=sampled (10%) / p= whole population
V60=varroa sampled out of 60 frozen bees
V300=varroa sugar shaked out of 300 bees

 

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