> ...After two years vaporizing in November, and finding high mite counts in 
> early summer, I was advised by Heilyser to vaporize 3 times, 7 days apart 
> in September. I did. Mite count went up or stayed the same...1 week after 
> final treatment.

Hmmm.  Four things:

1.) I never did think the Heilyser unit was the best option, after reading 
all the European web info available back at that time about sublimation and 
the fact that some units seemed to work better than others.  I did not have 
enough specific info to form a conclusion, however.

2.) Doing September application without a November treatment does not make 
sense to me, given what we know about he reduction of brood area over 
September and October and the sudden mushrooming in phoretic numbers as the 
last brood emerges.

3.) Some strains of bees in some regions may never go broodless.  That is a 
very big problem with oxalic.

4.) Is reinfestation form outside a possibility?

I am sure you made much a closer investigation of the exact mite profiles 
than is easily summed up here.

I notice that Cor is using mite drops and has all along.  It is my preferred 
method, too, because it is non-destructive and non-invasive and can be done 
any time and many times.  Of course the interpretation is much like reading 
chicken entrails, (but if that was good enough for the Emperors, it is good 
enough for me).  Drops can be misleading in the wrong hands, but are a good 
glimpse into the working for those who are not too literal-minded.

Medhat has some data and I don't know if he has it in a format suitable for 
presentation here, but if he does and offers it, that would help.

The fact that everyone here is back to strips (except Cor and I don't know 
who) is an indication of the unpredictability of oxalic and formic 
treatments and the fact that we don't have the whole thing nailed down. 

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