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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.
Pyrethrin is syntethically made by industrial methods, but it also naturally occurs in the Chrysanthemum flowers, and thus is often considered an organic insecticide, or at least when is not combined with piperonyl butoxide or other synthetic adjuvants.yrethrin is syntethically made by industrial methods, but it also naturally occurs in the Chrysanthemum flowers, and thus is often considered an organic insecticide, or at least when is not combined with piperonyl butoxide or other synthetic adjuvants.