The termite resistance of M. azedarach L. at age 5, 8, 11, 15 and 17 years was evaluated in laboratory. Results indicated that blocks, barks and seeds of M. azedarach L. at various age were toxic to the termite, C. formozanus, At the end of the 63 day experimental period, no termites survived on all of samples. Barks and seeds of M. azedarach, which contained more antitermitic substances, showed no termite damage. Analysis of variance showed significant differences in toxicity of blocks at various age to C....