2006-07-13 03:11:52 · 2 answers · asked by Athina joy f 1 in Environment
Do you mean pesticides that are formed from natural sources?
One is Spinosad, which is developed from two naturally occurring metabolites produced by the soil fungus Saccharopolyspora spinosa.
Rotenone is produced from the roots, seeds and leaves of certain tropical legumes. It is a widely used broad-spectrum insecticide.
Permethrin is a pesticide based on the chemical produced naturally by chrysanthemum flowers, and indeed you can buy formulations of permethrin that are obtained completely from the flowers. This means that even though the pesticides are chemically identical to the synthetically derived versions, they are legal to spray on 'certified organic' crops.
There are also several pesticides derived from the metabolites of bacteria. Bti, or Bacillus thuringiensis israelensis produces a toxin that is highly effective at killing aquatic larvae of a few families of Diptera, including Culicidae (mosquitoes). This naturally derived pesticide is now used all over the world to combat mosquitoes.
Another variety of bacteria, Bacillus thuringiensis kurstaki (Btk) is effective against open feeding caterpillars and sawflies, but is almost completely non-toxic to almost everything else (including people). It is gaining more and more use as a pesticide against critters that eat trees.
2006-07-13 04:52:58 · answer #1 · answered by Anonymous · 0⤊ 0⤋
battery, just like the potato
2006-07-13 03:14:56 · answer #2 · answered by R C 3 · 0⤊ 0⤋