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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.
Aspirin is a derivative of salicylic acid, making it a member of the salicylate family of compounds. Salicylates are natural compounds found in plants such as the willow tree, and are among the oldest known and widely used therapeutics commonly used to relieve pain, fever, and inflammation.spirin acts by preventing the formation of prostaglandins. The name prostaglandin comes from the old belief that this hormone was produced by the prostate gland. It is now known that prostaglandins come in several different forms (named by the letters A through I) and are produced in almost all mammalian cells.