Field Evaluation of Insecticides on Onion Thrips & their Subsequent Effect on Budworm Infestation at Mansehra

Abstract

Field Evaluation of Insecticides on Onion Thrips & their Subsequent Effect on Budworm Infestation at Mansehra The efficacy of three different insecticides Lannate 40 SP (2.5 g/lit), Karate 2.5 EC                                (3 ml/lit) and Curacron 500 EC (4 ml/lit) was tested for the control of onion pests Thrips tabaci                   and Helicoverpa armegra on onion crop at National Tea and High Value Crops Research                    Institute, Shinkiari, Mansehra during 2016-17. Evaluation of insecticides testing was                              based on average population of thrips and budworm, thousand grains weight inflorescence/                      plant, stalk/plant, umbel size, plant width, no. of florets/plant and stalk length. The insecticides were sprayed three times for the control of thrips and one time against budworm.                               Average population of pests were recorded by counting the number of live pests on randomly selected plants at intervals of 24, 48 and 72 hours and then on weekly basis. Results indicated        that all insecticides gave significant control of both pests. However, Curacron 500 EC at 4 ml/lit proved best showing minimum pests population after every application as compared to the other two insecticides and had least negative effect on vegetative and reproduction structures of onion bulbs.