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Effects of nitrogen management and Tricyclazole treatment on leaf blast severity in rice

Field experiment was conducted at Chiplima, Sambalpur, Odisha during wet and dry seasons of 2011–2013 to assess the effect of nitrogen application, fungicidal sprays and varietal resistance on leaf blast disease severity and yield of rice. There was a progressive increase of leaf blast severity with full doses of nitrogen as compared to the application of two-third of the recommended dose in the susceptible variety Swarna. During wet season, the best treatment observed was Swarna with 2–3 sprays of Tricyclazole 75 WP @0.6 g l−1 and 2/3rd nitrogen level showing 89.65% disease control, whereas during dry season, treatment having the resistant variety Pratikshya with 100% N was the best giving 96.92% disease control over check and was significantly superior to other treatments. The resistant variety with 100% N showed constantly low disease severity throughout the experiment in both the seasons. Two to three applications of Tricyclazole 75 WP @0.6 g l−1 along with two third recommended dose of N showed maximum increase in yield (43.74% in dry season and 59.96% in wet season) in the susceptible variety.