Pyrethrins are oily liquid esters, carefully refined from flowers of the Chrysanthemum family commonly known as the 'African Daisy'. Until recently, grown in only exotic, out-of-the-way places such as East Africa, India and New Guinea, it is now cultivated in Australia. Virtually harmless to mammals (warm blooded animals) and birds, this well understood, well documented, pesticide acts on insects' central and peripheral nervous systems by causing immediate paralysis
