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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.
PYRETHRINS (found in Nix, Rid, Clear, Pronto, End Lice, Eliminite) Pyrethrum and pyrethrins are pesticides made from flowers (a type of chrysanthemum). Synthetic pyrethroids (permethrins) are chemical imitations of these natural products. Synergists are chemicals added to increase their killing power.