Pyrethrum, also known as Dalmatian (or, inaccurately, Persian) insect powder, represents the dried flowers of the daisylike herbaceous perennial Tanacetum (Chrysanthemum) cinerariaefolium (Compositae) growing naturally along the east coast of the Adriatic Sea. It is the source of the economically most important botanical insecticides. Pyrethrum is one of the oldest natural insecticides in use in the world today, and it has one of the best safety records of all insecticides. http://www.hjagrifeed.com/botanical-pesticide-additives/pyrethrum-extract.html