Pyrethrum is approved for commercial sites, but it has to be on the 'approved' list. I believe it is the aerosol bombs that are not allowed, but that I would have to double check on. We have a few organic commercial operations that use this product to treat mites. We have to order it from Ag supply stores.
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The list of approved insecticides/fungicides gets narrowed down evey couple weeks. It often times has to do with labeling issues or undisclosed compounds being found during testing, rather than the compounds themselves.