Toxicity, the lethal dose, the mode of action, efficacy and persistence of the chemical composition of alcoholic, hexanic and aqueous extracts of the leaves of the Legume Pueraria phaseoloides were considered on the pest species of termite Macrotermes bellicosus. The contact toxicity of extracts of the termite is low and does not cause total mortality of the populations tested. The persistence of efficiency of the extracts is about 1.4 to 3.4 days. The hexane extract of leaves, the most toxic, has an LD50 of 158.6 + 0.41 mg / l. Its effectiveness does not appear to be related to its inhalation and ingestion by the insect. However, in contact, this extract has an inhibitory effect of food intake. It contains two main secondary compounds, flavonoids and terpenoids.