Abstract: Eight cultivars of tomato were studied under field condition in insecticide treated and non treated plots to observe the performance of these varieties against leaf curl disease. The effect of this disease in percent plant infection, insect population per plant, percent leaf area diseased, number of fruits per plant, weight of individual fruit (g), yield per plant (kg) and yield loss due to leaf curl infection were investigated. None of the varieties was found to be resistant against viral leaf curl disease. But the cultivar Raton was found to be somewhat resistant both in controlled and treated plots. In controlled plots the second best performance was shown by Manik. The other varieties were more or less affected by leaf curl virus. In insecticide treated plots, second highest yield was observed in Manik and Roma-VF varieties indicating that the cultivar Roma-VF has the potential to perform as good as Manik when cultivated under insecticidal condition. The cultivar Anobic suffered more due to leaf curl viral disease in terms of yield parameters under both insecticide treated and non-treated plots. Vector management using Malathion, improved the growth and yield parameters of cultivars.