Vol. 8, Special Issue 8, Part R (2024)

Abstract: The present study was carried out at Agricultural Research Institute, main farm, Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad during kharif 2021 to evaluate the bio-efficacy of newer insecticides and fungicides alone and in combination against yellow stem borer and sheath blight in rice. The study comprises of 16 treatments wherein three insecticides, chlorantraniliprole 18.5% SC, tetraniliprole 200 SC and cartap hydrochloride 50% SP and three fungicides, picoxystrobin 7.5% SC + tricyclazole 22.5% SC, azoxystrobin 18.2% SC + difenoconazole 11.4% SC and tebuconazole 50% WG + trifloxystrobin 25% WG were tested alone and in combination and compared with untreated control. The treatment plots were sprayed with the pesticides alone and in combination twice at 45 DAT and 65 DAT after ETL’s were ascertained. Observations were taken one day before spraying and 7 and 15 days after spraying. Among the insecticide alone treatments, T₂ tetraniliprole @200 ml ha^-1 was found to be most effective while, T₃ cartap hydrochloride @ 1000 g ha^-1 was next best against YSB and among the fungicide alone treatments T₅ (azoxystrobin + difenoconazole) @ 500 ml ha^-1 was found to be most effective. Out of all the combination treatments, T₁₁, tetraniliprole + (azoxystrobin + difenoconazole) @ 200 ml ha-1 + 500 ml ha^-1 was observed to be most effective against stem borer and sheath blight.