TOXIC PROSPECTIVE OF SOME NOVEL CHEMISTRY INSECTICIDES FOR RESISTANCE ECHELON IN TWO FOREMOST LEPIDOPTEROUS INSECT PESTS

Abstract

Resistance development in arthropods is the natural phenomena that is reinforced against any unbalanced revolutionize in the execution of any agro ecosystem. Its intensity has multifold during the management of major crop insect pests. As a result of misuse of the conventional insecticides had not only made them ineffective but also threat for new chemistry insecticides in future. For that purposes a study was planned for toxicity bioassay against two notorious lepidopterous pests as Helicoverpa armigera and Spodoptera litura by using nine modern insecticides each replicated thrice with four different concentrations and a control. Response, recorded after 48 hours after application, showed Chlorfenpyr was most effective against S. litura at all concentrations (100, 93, 100,97,87 and 14% mortality) at 330,165,82.5,41.5,20.6 and 0 ppm (Control) while Leufenuron was least effective showing highest susceptibility to armyworm as (53, 53, 47, 40, 27, and 33%) from low to high concentration 50,25,12.5,6.25 and 0 ppm. Similarly Leufenuron was least effectual demonstrated highest susceptibility to heliothis as (67, 70, 47, 40, 27, and 14% mortality) from low to high concentration 50, 25,12.5,6.25 and 0 ppm while Chlorfenpyr was highly efficient against H. armigera at all concentrations (97, 100, 87, 97, 87 and 14% mortality) at 330,165,82.5,41.5,20.6 and 0 ppm (Control) respectively.