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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.
Pyrethrum was used for centuries as an insecticide in Persia and Europe, and the mosquito coil was developed around the 1890s by a Japanese business man, Eiichiro Ueyama. At that time in Japan, people usually mixed pyrethrum powder with sawdust and burned it in a brazier or incense burner to repel mosquitoes.ctive ingredients found in mosquito coils may include: 1  Pyrethrum-a natural, powdered material from a kind of chrysanthemum plant; performance moderate. 2  Pyrethrins-an extract of the insecticidal chemicals in pyrethrum. 3  Allethrin-sometimes d-trans-allethrin, the first synthetic pyrethroid.