BIO-EFFICACY OF BIO-RATIONAL INSECTICIDES AND B.T. BASED BIOINSECTICIDES AGAINST SHOOT AND FRUIT BORER, EARIAS VITTELLA F. IN OKRA

Abstract

An investigation was laid out during summer season of 2008 and 2009 with F1 okra hybrid Sonal to find out the comparative efficacy of newly introduced insecticidal molecules and Bt formulations against shoot and fruit borer, Earias vittella F. in okra crop. The studies revealed that indoxacarb 14.5% SC proved to be the most effective treatment against the pest and it was at par with spinosad, imidacloropid and diafenthiuron and significantly superior over all other treatments. Amongst various Bacillus thuringiensis based bio-insecticides, halt exhibited maximum mortality i.e. 67.23 per cent at 7 days after spraying and was at par with biolap and dipel during 2008 and 2009. The maximum fruit yield was observed in indoxacarb treated plots i.e. 179.85 and 184.68 q/ha respectively durind 2008 and 2009 which was at par with all the insecticidal molecules during both the years. Fruit yield from Bt formulations treated plots was also recorded in which halt received higher fruit yield i.e., 136.20 q/ha during 2008 and 139.80 q/ha in 2009 followed by dipel and biolap.