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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.
There are two types of Pyrethrins found in these flowers-appropriately called Pyrethrin I and Pyrethrin II-they are usually combined in pest control formulas. Pyrethrin should not be confused with pyrethroids (such as Permethrin) which are synthetic insecticides.here are two types of Pyrethrins found in these flowers-appropriately called Pyrethrin I and Pyrethrin II-they are usually combined in pest control formulas. Pyrethrin should not be confused with pyrethroids (such as Permethrin) which are synthetic insecticides.