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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.
Chrysanthemums are beautiful flowers to have in your garden that deter both fleas and ticks as well as other insect pests. The chemical pyrethrum is a naturally occurring organic compound found in chrysanthemums, also called chrysanthemum extract, that disables the nervous system of fleas, thus fleas staying away.