Resistance ratio geographical variation in the susceptibility of P. xylostella to different biorationals

Abstract

Five different bioretionals, viz., entomopathogenic fungi such as Beauveria bassiana (1.15% WP) and Metarhizium anisopliae (1.15% WP), Bacillus thuringiensis (0.5% WP), Azadirachtin (300 ppm) and Spinosad (45 SC) were evaluated against DBM larvae. The data on resistance profile of P. xylostella population collected from different geographical locations viz. NBII, Bangalore, Akola, Sindkhed Raja, Karanja, Aurangabad and Coimbatore at ambient temperature on the basis of larval mortality revealed Karanja with higher resistance to all biorationals. The NBAII, Bangalore populations was used as the laboratory susceptible culture for comparison with populations from Akola, Sindkhed Raja, Karanja, Aurangabad and Coimbatore locations. Population from Coimbatore registered lowest LC50 value for Spinosad and Metarhizium anisopliae, whereas, Sindkhed Raja registered lowest LC50 value for Bacillus thuringiensis and Azadirachtin and Aurangabad population revealed lowest LC50 value for Bacillus thuringiensis and Beauvera bassiana.