Evaluation of certain insecticides against whitefly (Trialeurodes ricini Misra) and jassid (Empoasca kerri Pruthi) infesting castor.
A field trial was carried out in Gujarat, India, in 1982-83 to evaluate the effectiveness of 9 insecticides against Trialeurodes ricini and Empoasca kerri on Ricinus communis. The greatest reduction in numbers of both species was obtained with 0.05% monocrotophos after 1 or 2 sprayings (90%), followed by 0.05% dimethoate, 0.05% quinalphos and 0.07% endosulfan after 2 sprayings. The reductions obtained with the latter treatments varied between 70.5 and 83.2%. On the basis of the results, monocrotophos, dimethoate and quinalphos, all at 0.05%, are recommended for controlling the 2 pests on R. communis.