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Colorado State University puts out a list of pesticides considered safe for use on organic gardens. Here is what their website says: "Pyrethrum is the most widely used botanical insecticide in the United States. The active ingredient, pyrethrin, is extracted from a chrysanthemum plant, grown primarily in Kenya, Rwanda, Tanzania and Ecuador. Most insects are highly susceptible to pyrethrin at very low concentrations. The compound acts rapidly on insects, causing immediate knock down. Flying insects drop almost immediately after exposure. Fast knock down and insect death don't, however, always go hand in hand; many insects recover after the initial knockdown phase. Pyrethrum is non-toxic to most mammals, making it among the safest insecticides in use. The Environmental Protection Agency has approved it for more uses than any other insecticide.... Pyrethrum has been assigned a CAUTION rating."
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