Methods of application of disulfoton to control leafhopper in beans

Abstract

Two trials were set up in the counties of Lavras and Careaçu, MG, Brazil, at the February/ 1984 planting season to determine the efficiency of rates and methods of application of disulfoton sistemic insecticide to control the leafhopper (Empoasca kraemeri), on important pest of beans (Phaseolus vulgaris L.). The analysis of variance of the results obtained in the field tests showed that the seed treatment at dosages of 0.50; 0.75 and 1.00 kg/100 kg was less effective in controlling the pest. Spraying over the rows after planting with the insecticide at the rates of 1.0; 1.35 and 2.0 l/ha and the application of granules in the soil at the rate of 2.5 and 0.5 g/m were very efficient in controlling the leafhopper, giving levels of populational reduction around 81% - 99%, for a period of 46 days after planting. Due to the high toxicity of this insecticide and the advantages inherent in the utilization of granulars, this kind of application was recommended for the use of disulfoton to control E. kraemeri.