Bio-efficacy of insecticides against mustard aphid (lipaphis erysimi Kalt.) on mustard (Brassica juncea L.)

Abstract

The present investigations entitled: “Studies on insect-pests complex in mustard and bio-efficacy of insecticides against major insect-pests” was carried out at Students’ Instructional Farm of Narendra Deva University of Agriculture and Technology, Kumarganj, Faizabad during Rabi, 2016. All the treatments gave significantly higher yield (010.20-13.00 q/ha) over control (9.67 q/ha). The effect of treatment on seed yield was found higher yield (13.00q/ha) in Emamectin Benzoate @ 0.005%. As compare to other tested treatments. The result showed that all the chemicals had better yield in compression to botanicals. Among botanicals Nimbecidine @ 0.45% gave highest yield which over at par with other botanicals except castor oil. The Effectiveness of treatments was determined based on the population of mustard aphid was recorded one day before spray as pre-treatment observation, while post treatment observations were taken at 3, 7 and 10 days after spray. Application of treatments with botanical and chemical insecticides. Among all insecticides in which Emamectin benzoate @ 50g ai/ha. were found more effective due to minimum insect-pest infestation and resulted significantly more yield over control.