In a message dated 26/10/2010 00:54:41 GMT Daylight Time, [log in to unmask]  
writes:

While we  are on the subject of nosema, I would like to say that the idea 
that nosema  can be wiped out with fumigillin is a harmful notion at best. It 
won't work,  and the widespread use of this mycotoxin does not bode well 
for beekeepers or  the reputation of the honey industry.




When I first took up beekeeping a third of a century ago I was taught that, 
 to be effective, an application of Fumidil needs to be followed up with a  
complete change onto foundation or comb that has been sterilised with 
acetic  acid fumes at the earliest opportunity. Otherwise re-infection will 
rapidly take  place.
 
I did use Fumidil once, but nowadays tend to rely on frequent comb renewal  
or occasional sterilisation. It is rarely indeed that I see any external 
signs  of Nosema (fouling in/on the hive). It isn't every year that I look at 
guts  under a microscope to do a check. I ought to do so more often. I have 
seen  spores of both N apis and N ceranae through a microscope and, indeed, 
there may  be samples lurking in the back of my fridge!
 
Chris

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