The bioefficacy of insecticides against the red pumpkin beetle, Aulacophora foveicollis Lucas, on cucumber was investigated during the summer of 2020 at College Farm, College of Agriculture, Navsari Agricultural University, Bharuch, Gujarat, India. Six insecticide treatments [T1: Imidacloprid 70 WS 5g/kg seed ST + spray of lambda-cyhalothrin 4.9% CS, 0.007%, T2: Imidacloprid 70 WS 5g/kg seed ST + spray of Chlorantraniliprole 18.5 SC, 0.005%, T3: Imidacloprid 70 WS 5g/kg seed ST + spray of quinalphos 25 EC, 0.05%, T4: Imidacloprid 70 WS 5g/kg seed ST + spray of Cypermethrin 10 EC, 0.01%, T5: Imidacloprid 70 WS 5g/kg seed ST + spray of Chlorantraniliprole 9.3% + Lambdacyhalothrin 4.6% ZC, 0.004% and T6: Imidacloprid 70 WS 5g/kg seed ST + spray of quinalphos
(20%) + cypermethrin (3%) 23 EC, 0.023%] were evaluated for their bioefficacy against red pumpkin beetle, A. foveicollis on cucumber. The results showed that after the first spray, treatment T5 (1.14 beetles/plant) had a much lower beetle population than the other treatments. Treatment T1 (2.53 beetles/plant) and T3 (2.42 beetles/plant) noted a significantly higher beetle population. Among the different treatments, T5 (0.36 beetles/plant) recorded a significantly lower beetle population but was at par with T2. Treatment T1 (1.32 beetles/plant) recorded a significantly higher beetle population but was at par with treatment T3 after the second spray. In pooled over sprays, treatment T5 (0.73 beetles/plant) and T2 (0.94 beetles/plant) significantly differed from each other but recorded significantly lower beetle populations and were found most effective. Treatment T3 and T1 were found the least effective as they registered significantly higher beetle populations. Among the different treatments, the plot treated with T5 (118.33 q/ha) registered a significantly higher yield rest of the treatments but was at par with treatment T2 (118.33 q/ha) and T6 (115.56 q/ha). Treatment T1 (91.78 q/ha) exhibited significantly lower fruit yield in comparison to T5 and T2.