Hi, Debra. Dr. Dianna Sammataro demonstrated that keeping crisco patties in the hive 12 months out of the year would, by itself, reduce the population of tracheal mites to below the level of economic damage. Then Dr. Steve Sheppard demonstrated that inclusion of mint oils in the patties substantially increased their efficacy. Check out Bob Noel's website <rnoel.virtualave.net>. Dan
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