Development of an Integrated Disease Management Model for Control of Onion Downy Mildew

摘要

An integrated disease management model (IDMM) was developed, from the findings of two year research, which included the testing of NPK fertilizer 120:90:60 kg ha ^-1, plant population 0.5 million plants ha ^-1, 8 irrigations/season, fungicide Ridomil @ 250 g 100 L ^-1 plus Antracol/Dithane M-45 @ 200/300 g 100 L ^-1 and herbicide Ronstar @ 5 ml L ^-1. This model was verified against Farmers` Own Practices (FOPs) for control of downy mildew of onions. The IDMM reduced the Area Under Disease Progress Curve (AUDPC) and increased substantially bulb size (cm) and bulb yield (t ha ^-1) by 3.7-4.1 and 20.3-28.2%, respectively. The multi location testing of IDMM proved its superiority over FOPs in minimizing the disease attack and improving the crop yield.