I ust remembered this recent finding:
The results of this study also indicate that mite-sampling data can be
highly variable. Mite numbers from sticky board samples were found to vary
by as much as 250% in as little as two weeks.  These data make it difficult
to set mite number thresholds for beekeepers to use when making management
decisions for colony treatment. Colonies deemed below a treatment threshold
may show mite populations significantly above the threshold two weeks later
when sampled in late summer and early fall.

Fell, R., C. Brewster, & A. Mullins - THE SPATIAL DISTRIBUTION OF VARROA
MITES IN HONEY BEE HIVES - ABRC 2010


Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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