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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.
Pyrethroids are synthetic compounds that donât just repel but kill insects. Theyâre similar in structure to natural pyrethrins, which are derived from the flowers of a certain chrysanthemum. But synthetic pyrethroids are more persistent in the environment and some are carcinogens and suspected endocrine disruptors.