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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 are the natural insecticide found in daisy like Chrysanthemum flowers grown and harvested in Kenya, Africa and Australia. Pyrethrin is considered a Botanical ânaturalâ insecticide because it is derived from plants. Source: http://www.agrihealthcare.com/natural-insecticide-pyrethrin/.yrethrins are the natural insecticide found in daisy like Chrysanthemum flowers grown and harvested in Kenya, Africa and Australia. Pyrethrin is considered a Botanical ânaturalâ insecticide because it is derived from plants. Source: http://www.agrihealthcare.com/natural-insecticide-pyrethrin/.