Tests with Systemic Insecticides on Rice

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Abstract
Greenhouse and small plot tests were conducted in 1958 through 1960 with systemic insecticides to control a leafhopper, Draeculacephala portola Ball, on rice. In two greenhouse tests, seed treatment with Di-syston (O, O-diethyl S-2-(ethylthio)ethyl phosphoro-ditioate), and phorate at 1 pound active ingredient per 100 pounds of seed, leafhopper control was obtained for approximately 30 days. The most effective control with granulated Di-syston in a greenhouse test was obtained when applied to the soil, flushed with water and flooded 24 hours later. Phorate was slightly more effective than Di-syston when applied to the soil as granules at the 2-pound rate. At the 4-pound rate, the two were equally effective. In small plot tests, phorate and Di-syston when applied as granules broadcast at 2 pounds of active ingredient per acre, reduced leafhopper populations and increased yields. Phorate and Di-syston at 2 and 4 pounds active per acre applied as granules in the furrow at planting time produced increases in yield that were significant.

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