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The most commonly available pyrethrum-based insecticides contain extracts from the flowers called pyrethrins. The advantage in the vegetable garden is that a pyrethrin insecticide is effective against a wide variety of hard-to-kill insects like aphids, beetles, leafhoppers, and certain caterpillars.he source of pyrethrum is the flowers of Chrysanthemum cinerariaefolium, also called the Dalmation flower. Photo: Pam Peirce. The source of pyrethrum is the flowers of Chrysanthemum cinerariaefolium, also called the Dalmation flower.
Pyrethrins & Pyrethroids What are pyrethrins? Ã¿ Pyrethrins are insecticides that are derived from the extract of chrysanthemum flowers (pyrethrum) (1). Ã¿ Theplant extract,calledpyrethrumcontainspyrethrin I and pyrethrin II collectively, called pyrethrins. â¢ Pyrethrins are widely used for control of various insect pests. What are pyrethroids? Ã¿ Pyrethroids are synthetic (human-made) forms of pyrethrins. Therearetwotypesthatdifferinchemical structure and symptoms of exposure. Ã¿ Type I pyrethroids include allethrin, tetramethrin, resmethrin, d-phenothrin, bioresmethrin, and permethrin (1, 2). Ã¿ Some examples of type II pyrethroids are cypermethrin, cyfluthrin, deltamethrin, cyphenothrin, fenvalerate, and fluvalinate (1, 2). Ã¿ Both type I and II pyrethroids inhibit the nervous system of insects. This occurs at the sodium ion channels in the nerve cell membrane. Some type II pyrethroidsalsoaffecttheactionofaneurotransmitter called GABA (3).