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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.
Active 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.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.