The work research was present carried out in order to impregnating the insecticides: lmidacloprid, Methylic Pirimifos, Clorpirifos in seeds of rice to determine the lethal effect in insects to the Seedling level and its residual power up to 25 days after the transplant. lt was located in the 1 found "El Llano" of property of M. S. Alexandria'S, in the kilometer 13,5 of the highway Tarapoto -Moyobamba, compression of Cacatache of the district, of San Martín of the province and Country, inside the south latitude of 6º 32', Longitude west 76º23 • and altitude 350 m. s. n. m. The design of blocks complete randomized was used with 7 treatments (lmidacloprip to the doses of 1.20, 1.79, 2.40, 2.99 g, Pirimifos Methyl to 0.067 g, Clorpirifos to 0.096 g. of p. c. for Kg of seed of rice and a witness without insecticide) and with 3 repetitions. Ali the rehearsed insecticides didn't affect the...