Age related response of Pieris brassicae (Linn.) to biorational insecticides.

摘要

Treated leaf discs of cabbage with different insecticides were fed to the larvae of different age groups of Pieris brassicae and observations were recorded on the mortality. All the treatments were significantly superior over the untreated check. The extract of NSKE 5% caused highest larval mortality (48.0%), showing significant difference from other indigenous products, while dichlorvos 0.05% was statistically on par with endosulfan 0.07%. Botanical extracts were found to be least effective. However, with the increase in the age of larvae, the toxicity of insecticides decreased and the mortality was enhanced at 72 hrs. exposure.