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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.
The term pyrethroid is confusing to many because of its similarity to the name of the natural insecticide mixture known as pyrethrum or pyrethrins. Pyrethrum is one of the oldest known insecticides and comes from the dried and crushed flowerheads of two species of asters: Chrysanthemum cinerariifolium and C. coccineum.he common name of the active ingredient in this product is permethrin. Itâs not too difficult to recognize a pyrethroid insecticide. Look at the pesticide label, generally on the front of the product, and look for the list of active ingredients. Active ingredients usually list a chemical and a common name.