Considering the economic importance of the maize Zea mays (Poales: Poaceae) crop and the losses caused by the maize stem borer, an experiment was carried out in a plot of 15 m² that was equally divided into three replications using randomized complete block design to find the effect of granular and liquid insecticides on Chilo partellus and crop yield. The trial was laid out at the Agricultural Research Station in Baffa, Mansehra, Pakistan during the Kharif season 2015. In this experiment, granular insecticide Carbofuran 3G and liquid insecticides Cypermethrin10 EC, Endosulfan 35 EC, Karate 2.5 EC and Chlorpyrifos 10 EC were used for treating maize stem borer. The obtained results revealed that Carbofuran 3G proved significantly to be the most effective in reducing plant damage, the number of dead heart plants and the number of pest larvae. Additionally, the treatments caused an increase in grain yield. The liquid insecticides Cypermethrin and Karate ranked second, and Endosulfan and Chlorpyrifos ranked third in efficacy against the pest. On the basis of present findings, it was recommended that the granular form of insecticides in general and Carbofuran 3G in particular may be used for effective control of C. partellus in maize crop. The granules should be applied in plant whorls, which will give better results than application through other methods. In the case of foliar applications, Cypermethrin is recommended to get effective control among other liquid formulations. Although the chemical treatments which were used in this research gave good control of C. partellus infestations and increase in yield as compared to check, some variations still occur in the amount of damage, population density of the pest and yield of crop. These differences may be due to differences in types of treatments, methods of experimentation, and environmental factors like temperature, humidity etc.