Interactive effects of insecticide, intercropping and irrigation on the crop growth, pest incidence and crop yield of pea, Pisum sativum Linn.
Field experiments carried out in Delhi, India, in 1980-82 showed that root nodulation in pea was accelerated by application of insecticide (carbofuran 3 G at 1.0 kg a.i./ha) under irrigation. In addition, under these conditions, the incidence of pests such as Phytomyza horticola [Chromatomyia horticola] and Macrosiphum pisum [Acyrthosiphon pisum] was minimum. Insecticide application also interacted with cropping systems in minimizing the incidence of Aphis craccivora and Acyrthosiphon pisum. Neither of these 2 species was observed on pea when intercropped with barley and treated wth insecticide. Aphis craccivora was not observed on pea when the crop was treated with insecticide and intercropped with linseed [flax]. The crop yield of pea was higher when the crop was irrigated at the flowering/pod initiation stage than when the crop was not irrigated.