hi all: pyrethrins were formely a pesticide of vegetal origin. The plant is a chrysanthemum (C. Cinerariaefolium), a compositae, and its content in the flowers range from 0.7 to 3%. The vegetal pyrethrin acts as contact pesticide and are very toxic to insects; its effect over human is of low toxicity. However, those synthetic pyrethrins (for the first time in Germany, 1951) are very dangerous to ourselves, LD50 30 mg/kg. Don't you have any plant around to be used instead of? warm thoughts Nelson.
------------------------------------------------- This mail sent through IMP: http://horde.org/imp/
