I believe Dave Westervelt (Florida state Bee Inspector)did a study on SHB for the USDA. Some of the things he tested/studied were DE/Borax, and other materials and their effects on the various stages of SHB. The results he related to us at a bee meeting were that the larva were not effected by either material, and in fact the larva could thrive and mature when placed into containers containing the materials. SHB larva skin is extremely tough and DE does not cut through it.
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