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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. Pyrethrins are a class of drugs derived from the Chrysanthemum flower/plant, while pyrethroids are synthetic derivatives. Pyrethrins and pyrethroids typically come in varying concentrations (from < 1% to up to 55% or more). Higher concentrations can be safely used on dogs; however, cats are very sensitive to these chemicals and cannot metabolize these drugs well as dogs.