Abstract: The field incidence of the serpentine leaf miner, L. trifolii(Burgess) was severe during the fruiting stage of the crop and infestation was higher on lower surface of leaf in comparisons of upper surface. On the basis of cumulative susceptibility index test varieties viz. HS-102, SEL-14, Pant T-4, PS-8, PT-28, NDT-44, BT-117-5-3-1, Pusa Ruby (Check), KS-118, Pant Bahar, CO-3, Pant Hybrid-1, BBs-109, NTH-337, BRH-01, ARTH-04, BS-2530, NDT-9, Meenakshi-H1, Punjab Chhuhara, NDT-96 were found to be resistant/less susceptible. Only nine test cultivars viz. BT-20-1-4, KS-2, PT-3, Sweet-72, Pant Hybid-2, TH-2312, Ratna, Avinash, Sohali were found to be moderately susceptible/moderately resistant. No cultivar was found highly susceptible against leaf miner. No significant correlation could be established between the number of leaf mines and yield of tomato crop. Although yields differ significantly between different varieties, probably compensation for leaf injury played a major role in yield recovery.