The field experiment was carried out at the Cotton research Station, Junagadh Agriculture University, Junagadh during Kharif-2015-16, 2016-17 and 2017-18. The results of experiment were revealed that all the nine insecticidal treatments were found significantly superior to untreated control in reducing the larval population in cotton. The significantly lowest larval population was recorded in plots treated with Lambda cyhalothrin 2.5 EC 0.0025% (1.34 larvae) and Deltamethrin 2.8 EC 0.0028% (1.52 larvae). These two insecticidal treatments were significantly superior to rest of the tested insecticides. While in case of green boll damage, the lowest boll damage was found in Lambda cyhalothrin 2.5 EC 0.0025% (4.2%) and Deltamethrin 2.8 EC 0.0028% (4.9%) and there was a significant difference in damage to open bolls and locule at harvest among treatments. The lowest open bolls and locule damage was recorded in Lambda cyhalothrin 2.5 EC (19.07%) and Deltamethrin 2.8 EC (21.28%). The highest seed cotton yield was recorded in Lambda cyhalothrin 2.5 EC 0.0025% (2337 kg/ha) and Deltamethrin 2.8 EC 0.0028% (2296 kg/ha). The present study suggests that the Lambda cyhalothrin 2.5 EC 0.0025% and Deltamethrin 2.8 EC 0.0028% could effectively reduce pink bollworm infestation and lead to improve productivity of Bt cotton.