an evergreen of the tropics and sub-tropics. and is becoming increasingly popular for its insect repellant traits and unique property of inhibiting the nitrification process in the soil. Scientists have now turned their attention to this wonder tree and are studying the chemical composition of extracts from its leaves, seed kernel, bark and other parts. Several biological pesticides based from extracts of this tree are available today. Scientists suggest mixing extracts with prilled urea to increase the efficiency in use of nitrogen in wetlands. The history of this tree involves a class case of biopiracy.