Antifeedant effect of Neem Formulations against Rice Leaffolder, Cnaphalocrocis medinalis and Hispa, Dicladispa armigera

Antifeedant effect of neem formulations namely NG4 (300 ppm azadirachtin), nimbecidine (300 ppm azadirachtin), rakshak (1500 ppm azadiiachtin) and neem azal T/S S10,000 0pm azadirachtin) was studied at different concentrations against the larvae oo fice leaffolder Cnaphalocrocis medinalin and adults of rice hispa Dicladispa armigera. In a no-choice test against leaf folder rakshak at 1.0%, NG4 at 4.0% and neem azal T/S at 1.0 and 0.3% concentrations exhibited considerable feeding'deterrency based on reduced leaf damage. Against rice hispa, nimbecidine at 4.0 and 2.0% and rakshak at 1.0% were superior to the other treatments, recording lower leaf damage in no-choice test, while in choice test, nimbecidine at 4.0 and 2.0% neem azal T/S at 1.0% and rakshak at 2.0% showed considerable antifeedancy. The phagodeterrency or primary antifeedancy of neem formulations operated against both the insects.