Tomato is the most important vegetable crop attached by many insect pests. Among them leaf miner is the most serious and destructive. Experiment used was Randomized complete block design with five treatments along with control, replicated thrice. The insecticides used viz., Lambda cyhlothrin 2.5% EC, Ulala (Flanicamid 50% WG), Acetamiprid 20 SP and Imidacloprid 25% WP. The crop was sprayed twice at 20 days interval. Percent damaged after two spray application was observed. The lowest percent damage of tomato leaf miner infestation was recorded in lambda cyhalothrin treated plot (10.96%) followed by Imidacloprid (13.76%) which was statistically similar with Ulala (Flanicamid 50% WG) (14.64%) and Acetamiprid (14.93%) respectively while highest damage was reported from check plot (30.79%). Results showed that highest yield was recorded from lambda cyhalothrin (2661.7 kg ha^-1) treated plot followed by Imidacloprid 25% WP (1979 kg ha^-1). The control plot showed significantly lowest yield (1277.7 kg ha^-1) as compare to all other treatment. Cost benefit ratio was recorded highest in plot treated with Lambda cyhalothrin (1:6.3) and lowest was observed Ulala (Flanicamid 50% WG) (1:3.2) respectively. It is concluded from the above study that the insecticides Lambda cyhlothrin 2.5% EC showed least percent damage, highest yield Kg/ha and highest CBR as compared to other treatments.

Key words: Tomato, leaf miner, chemicals insecticides, Peshawar.