Vol. 12, Issue 5 (2023)

Author(s):
A.S. Chincholkar, Usha Yadav and P.N. Magar

Abstract:
An investigation was conducted to evaluate comparative field efficacy of biorantionals and chemical insecticides against shoot and fruit borer in Okra during Kharif 2022-23. All the biorationals and chemical insecticides tested were significantly reduced the infestation of okra shoot and fruit borer (OSFB) compared to control. The lowest 9.22% shoot and 8.66% fruit infestation of OSFB was observed in treatment Chlorantraniliprole 18.5% SC and found to be the best superior treatment followed by Emamectin benzoate 5% SC recorded 10.20% and 13.46% shoot and fruit damage. The next effective treatment was Imidacloprid 17.8% SL recorded 11.09% shoot and 14.97% fruit damage. Among the biorationals, NSKE 5% found to be most effective treatment recorded 12.25% shoot and 15.81% fruit damage followed by Azadirachtin 1500 ppm 13.84% and 16.64%, shoot and fruit damage respectively. Among the myco-insecticides Metarhizium anisopliae 1x10⁸ CFU/gm was found to be most effective treatment and recorded 14.46% shoot and 17.59% fruit damage and least effective treatment was Verticillium lecanii 1x10⁸ CFU/gm recorded highest (15.28%) shoot and (18.19%) fruit damage in okra. However, when cost benefit ratio was worked out, the highest yield (154.28q/ha) with C:B ratio of 1:7.21 was recorded in T₆ Chlorantraniliprole 18.5% SC and found to be best superior treatment followed by T₅ Emamectin benzoate 5% SG recorded 135.15 q/ha yield with 1:6.95 C: B ratio followed by T₇ Imidacloprid 17.8 SL recorded (129.51 q/ha and 1:6.67), T₃ NSKE 5% (97.69 q/ha and 1:4.83), T₄ Azadiractin 1500 ppm (91.71 q/ha and 1:4.58), T₁ Metarhizium anisopliae 1x10⁸ CFU/gm (75.64 q/ha and 1:3.89), T₂ Verticillium lecanii 1x10⁸ CFU/gm (64.87 q/ha and 1:3.34) and recorded lowest yield 50.14 q/ha and C:B ratio 1:2.68 in T₈ control.