Show Barbasco Yields Rotenone Rotenone From the root of the barbasco is derived rotenone which is non in jurious to human beings while pro pro- providing providing viding v ding an effective protection to crops against a insects Believed to have ha-e been used by the aboriginal Indians of the Americas it was taken up by modern agriculturists ts only a few years ago Its use in inthe inthe inthe the United States spurted suddenly in 1940 when G million pounds were imported import d in crude and powdered form |