Field performance of newer insecticides against whitefly, Bimisia tabaci Genn in tomato

Investigations were conducted in four different villages in Gopalganj district of Bihar to assess the performance of newer insecticides against whitefly in tomato. The experiment consisted of seven treatments laid out in randomized block design replicated three times with plant spacing of 60 x 50 cm. All the alternate sprays of newer insecticides were found significantly superior over the farmers’ practice and untreated check in minimizing the whiteflies infestation on the crop. Among the various treatments alternate spray of spiromecifen 240 SC @ 1.0 ml/l and thiomethoxam 25 WSG @ 0.25 ml/l at 15 days interval resulted in minimum number of whiteflies per plant (4.52) as compared to dimethoate 30 EC (farmers'practice)and controlwith12.68 and 29.45 whitefliesper plantrespectively. The number of curled leaves per plant was also minimum in spiromecifen 240 SC @ 1.0 ml/l and thiomethoxam 25 WSG @ 0.25 ml/l at 15 days interval (24.16%). The yield was recorded maximum in the same treatment (144.96 q/ha). Thus there was an increase of 53.68 q/ha of tomato crop in this treatmentover control with maximum net return of Rs 58, 161.00. The B-C ratio of 10.65: 1 was highest in treatment alternate spray of chlorfenapyr 10 SC @ 0.25 ml/l and acetamiprid 20 SP @ 1.0 g/l water at 15 days interval.