EFFICACY OF DIFFERENT INSECTICIDES ON LEAFHOPPER (AMRASCA BIGUTTULA BIGUTTULA.) POPULATION IN EGGPLANT (SOLANUM MELONGENA L.) VIS-A-VIS REPEATED AND SEQUENTIAL APPLICATION

摘要

The present study focuses on the efficacy of repeated and sequential application of four different insecticides at their recommended doses in control of leafhopper in eggplant. The study was conducted in two consecutive Kharif and Rabi seasons of 2009-10. Four different insecticides namely Triazophos 40% E.C, Carbaryl 50% W.D.P, Cypermethrin 10 % E.C and Azadiractin 10000 ppm were used in the study. Four consecutive sprays of each insecticide at their recommended dose were applied in both the seasons at an interval of 15 days starting after one month of transplanting. Parallely, these four insecticides were applied sequentially at an interval of 15 days in two different spraying sequence of insecticide i.e., Triazophos-Carbaryl-Cypermethrin-Azadiractin (S1) and Azadiractin-Cypermethrin-Carbaryl-Triazophos (S2). The results reveal that the mean population of leafhopper was significantly (p＜0.05) reduced in all the treated plots in comparison to the control plot in both the seasons. However, more effective control of the pest was obtained by sequential application of insecticides in comparison to repeated application of the same insecticides.