In addition to Dr. Diana Sammataro's work, Dr. Steve Sheppard at
Washington State University demonstrated that the addition of mint
oils substantially increased the efficacy of the patties to control
tracheal mites.  Use them 12 months of the year but keep them out of
the cluster's way during the winter.  LorAnn Oils, l-800-862-8620,
sell mint oils and give beekeepers a discount so identify yourself as
one when you order.  Addition of a generous amount of honey - I use
two Tbs per 1/8# of Crisco - greatly increases the palatibility to
the bees and will result in them eating it from the top bars of the
top box as well as those between boxes.  See also "The Role of Mint
Oils in Suppressing Mites" in "PSBA Forum" in <pugetsoundbees.org>
Dan



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