Small plot tests were conducted during 1959 and 1960 to control the larval stage of the rice water weevil, Lissorhoptrus oryzophilus (Kuschel). Aldrin and heptachlor were equally effective either when applied as a seed treatment or when mixed with fertilizer. Four ounces of the active ingredient per acre applied with fertilizer and 4 ounces of the active ingredient per 100 pounds of seed as seed treatment gave optimum control. Yield increases were obtained from controlling the insect in four of the five tests. Yield increases were significant in three of five tests.