Compatibility of three native isolates of Beauveria bassiana OP271760 (BTL1), OP290199 (BTL2) and OP292066 (PKDE) with five commonly used insecticides (imidacloprid, chlorantranilprole, cypermethrin, thiamethoxam and spinosad) and three fungicides (carbendazim, copper oxychloride and hexaconazole) were tested to identify and incorporate the compatible strain(s) in IPM. The B. bassiana isolate PKDE was compatible with most insecticides commonly used in Kerala except quinalphos. There was more than 80 per cent growth when checking compatibility with chlorantraniliprole, imidacloprid, thiamethoxam and spinosad. The isolates, BTL1 and BTL2 showed slight compatibility with insecticides viz., chlorantraniliprole, imidacloprid, thiamethoxam and cypermethrin with 20-40 per cent growth. Spinosad was 90 to 100 per cent compatible with all three isolates of B. bassiana in the present study. Among fungicides, hexaconazole and carbendazim completely inhibited the growth of all three isolates, whereas copper oxychloride showed 89 per cent compatibility with the isolate PKDE.
Nimisha et al. (Fri,) studied this question.