author(s)
P Swathi, PN Ganga Visalakshy and SB Das

abstract
The susceptibility of second instar Helicoverpa armigera (L-2) to seven strains of Beauveria bassiana, was tested under laboratory conditions at ICAR-IIHR, Bengaluru during 2016-17 using the larval immersion method. The highest virulence (100%) was recorded in strain-4 with LC₅₀ value (2.02 x 10⁵spores ml^-1) followed by strain-1(92.50%) with LC₅₀ value (2.48 x 10⁵ spores ml^-1) at 120 hours after treatment. Corrected mortalities ranging from 59.50 to 100% at different hours after treatment were recorded in all the strains with more profound effects in strain- 4 and strain-1.