A researcher yesterday told me that he maintains "nosema
> colonies" so that he has a source when spores are needed.  He says that
> occasionally a colony which was a good source one week can have almost
> nothing in the way of infection the next.

I made a call and my researcher said:

One week ( 7 days) nosema levels can change but not as drastic as indicated
above ( only his opinion and I am only expressing a different opinion as
neither Allen I I are going to name our researcher).

His opinion is that spore samples always seem to vary and several taken the
same day can vary. he does find going from a high level to *almost nothing*
being a problem with sample taking. In his opinion rapid drops mainly come
with a treatment although the weather and several other factors like honey
flow can cause drops or increases in spore counts but his experience does
not suggest a rapid change.

Ask 20 beekeepers the same beekeeping question and you might get 20
different answers. researchers are similar on subjects without vast research
to draw from. The spotlight in the U.S. has mainly been on nosema ceranae
since the winter of 2006-07 or a little over three years. Spain has double
the experience with the issue!

bob

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