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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 a group of man-made pesticides similar to the natural pesticide pyrethrum, which is produced by chrysanthemum flowers. Although more than 1,000 pyrethroids have been made, only a few are used in the United States.These include permethrin (BiomistÂ®), resmethrin (ScourgeÂ®) and sumithrin (AnvilÂ®).Pyrethroids are found in many commercial products used to control insects, including household insecticides, pet sprays and shampoos.he amount of pyrethroids used in gardening products can be two to three times more than what is used when fogging for insects. Because pyrethroids and other chemicals are present in gardening products, they may be on the skins of fruits and vegetables.