Management of brinjal shoot and fruit borer Leucinodes orbonalis with chemicals and crude plant extracts

摘要

Field experiments were conducted during Kharif 2014 and 2015 to evaluate the performance of four Central Insecticide Board recommended chemical insecticides and two plant extracts against brinjal shoot and fruit borer, Leucinodes orbonalis. The findings of the two years experiments revealed that the treatment of chemicals comprising of a 3-spray schedule of quinalphos (Krush 25%) @ 2ml/L followed by cypermethrin (Auzar 25% EC) @ 0.30 ml/L after 15 days of 1st spray followed by quinalphos (Krush 25%)@ 2ml/L after 15 days of 2nd spray was found to be the most effective with minimum shoot damage (4.60 per cent) and fruit infestation (9.28 per cent on number basis and 10.55 per cent on weight basis). This spray schedule also resulted in the highest marketable fruit yield of 135.18 q/ha, net returns of Rs.127582.53 per ha and was the most economical with the B:C ratio of 5.60.