Effect on infestation intensity, extent of damage and yield £>f eggplant of carbofuran and cypermethrin applied in different combinations against brinjal shoot and fruit borer

Abstract

Abstract : The treatments displayed highly significant effect in reducing the infestation intensity on fruits as well as in protecting the edible portion of the fruits. Although the treatments could not so greatly reduce the infestation, the best one T4 (Furadan 5G applied at 20 days after transplanting and Cymbush 10 EC applied at 5% level of fruit infestation and repeated at 15 days interval) reducing only 30.35% and 31.57% fruit infestation by number and weight respectively, they displayed highly significant effect in reducing the infestation intensity as well as in protecting the edible yield. The infested fruits belonging to Scale 4 i.e., those with very high infestation intensity were only 0.38% and 0.48% in T, and T2 respectively while those belonging to Scale 1 was 72.31% and 66.16% in T4 and T2 respectively as against 4.99% to Scale 4 and 42.65% to Scale 1 in control. The infestation intensity had quite a significant effect on the size, extent of damage and weight of the fruit. Thus the fruits belonging to Scale 4 were of very small size, had suffered = considerably more damage and had very low edible yield as compared to those belonging to Scale 1, which were of much bigger size, had suffered less damage and had much more edible yield. Thus the effect on infestation intensity per fruit has : been found one of the important criteria in evaluating the efficacy of insecticides = against brinjal shoot and fruit borer.