Tests with Systemic Insecticides on Rice

Abstract

Greenhouse and small plot tests were conducted in 1958 through 1960 with systemic insecticides to control a leafhopper, Draeculacephala Portola Ball, on rice. III two greenouse tests, seed treatment with Di-syston® ( O,O -diethyl S-2(ethylthio)ethyl phosphoroditioate), 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 lit the 51-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, r duced leafhopper populations and increased yields. Phorate and Di-syston at 2 and 4 pounds active per acre applied as glanules in the furrow at planting time produced increases in yield that were significant.