2024, Vol. 7, Issue 2, Part B

author(s)
Shivashenkaramurthy M, Prakash G, Arjun RS, Heena MS, Veena Chandavari, Savita Basavaraju M and Majeed

abstract
Onion is the most commonly cultivated commercial vegetable and spice crop. Crop is being affected by various diseases and pests. Recent years, leaf twisting disease became a major diseases in onion and causing ranging from 20- 70%. On farm trials were conducted on “Assessment of Integrated management practices against twisting disease in Onion in the farmer’s field conditions” of adopted villages of Vijayapura district during 2022-23 and 2023-24. The study was conducted by Krishi Vigyan Kendra, Indi (Vijayapura District), University of Agricultural Sciences, Dharwad, Karnataka. The on farm trials were laid out in eight farmer’s field with two alternate technology options having integrated approaches (Technology Option 2: Module 1- DOGR, Rajgurunagar, Pune and Technology Option 2: Module 2- Adhoc recommendation UAS, Dharwad) which were compared with farmers practice (Technology Option 1). Two years pooled data indicated that technology option 3 (Soil application of Neem cake 5 q/ha+ Trichoderma + Pseudomonas 5 kg/ha with 100 kg of Farm Yard Manure (FYM)/ha + Seed treatment with Carbendazim @ 2 g/kg and seedling dip with Pseudomonas florescens @ 10 g/l + Foliar spraying of Boron @ 2 g/l at 20 DAT and Multi K @ 3 g/l at 40 DAT + Foliar spraying Hexaconazole 5 EC @ 0.1% and Fipronil 5 SG @ 1 ml/l at 30 DAT and 60 DAT.) recorded highest bulb yield (146.8 q/ha) followed by technology option 2 (Soil application of Trichoderma sp @ 2 kg multiplied with 100 kg of (FYM)/ha + Seed treatment with Trichoderma sp @ 6 g/kg seed + Seedling root dipping in solution of 0.25% Carbosulfan 25 EC + 0.1% Carbendazim 50 WP) + Foliar spray of insecticide Fipronil 5 SG @ 1 ml/l + Foliar spray of fungicide 0.1% Hexaconazole 5 EC or 0.1% Propiconazole 25 EC) which was reported bulb yield of 127.2 q/ha. Whereas, technology option 1 (Spraying with combinations of pesticides for three to four times) noticed lowest bulb yield of 93.4 q/ha. Least twisting percent was reported in technology option -3 (8.1%) followed by technology option -2 (12.9%). Highest twisting percent was recorded with technology option- 1 (38.2%). Highest gross returns (Rs. 3,92,000/ha), net returns (Rs. 1,96,258/ha) and B:C ratio (3.78) were reported with technology option – 3 followed by technology option -2 which was recorded gross returns, net return and B:C ratio of Rs. 2,55,430/ha, Rs. 1,71,484/ha and 3.04, respectively. Lowest values were recorded with technology option – 1. Integrated approaches like application neem cake, seed and seedling treatment with bio-agents and spray of pesticides were found effective in managing twisting disease in onion with increased bulb yield.