> https://doi.org/10.3390/insects10010019
> Results not statistically significant but there does seem to be a trend
> line...


Agreed, there certainly appear to be trends that may not have been
statistically significant.
 Plus it appears that the amitraz spray may have had a short-term effect
upon varroa.
The results strongly suggest that waiting 'til November to treat was too
late--no surprise there.

Gene, did the colonies experience a big pollen flow in September?  The
sampling date of 18 Sept would have underestimated the varroa infestation
rates, since there was a huge spike in broodrearing at the time.

Gene, were the colonies checked to see whether they were broodless at the
time of oxalic vaporization?

A couple of small details--molten wax doesn't "dry"--it stiffens.  And if
you figure out the mite infestation rate for 100 bees from a sample of 300
bees, that's *interpolation *not extrapolation.
-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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