Abstract
Sheath blight disease is one of the major fungal diseases of rice. Studies on the role of different weather parameters in the initiation and progression of the disease was carried out taking seven weather parameters as independent variables and cumulative and periodical increment in percent disease index as dependent variables. The main aim was to find out the most critical and contributory weather parameter (s) towards development of the disease in west central table land zone of Odisha. The study revealed that a heavy rainfall was conducive for initiation of the disease followed by low and intermittent rainfall of 13 to 38 mm, which was found favourable for progression of the disease. A maximum temperature range of 310C to 340C, minimum temperature range of 170C to 230C with 70 to 83 per cent evening relative humidity were found favourable for disease development and spread.
Highlights
Rice (Oryza sativa L) is the main food crop of majority of the Indian population
Among the fungal diseases sheath blight caused by Rhizoctonia solani Kuhn has become one of the important diseases in all the major high yielding rice varieties grown in India
Progress of the disease was measured in terms of cumulative increase in percent disease index (CIPDI) and periodical increment in percent disease index (PIPDI) and designated as Y1 and Y2 respectively
Summary
Rice (Oryza sativa L) is the main food crop of majority of the Indian population. The crop is commonly infected by a number of fungal, bacterial and viral pathogens. The periodical increment in percent disease index (PIPDI) was worked out from CIPDI and the weather parameters like maximum and minimum temperature, morning and evening relative humidity percentage, total rainfall in mm, sunshine hours per day and daily wind speed in km h-1 were recorded from the meteorological station of RRTTS, Chiplima for the entire period of experimentation.
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