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Pattern of Sheath blight (Rhizoctonia solani Kuhn) disease development in rice cultivars possessing different degrees of susceptibility

KrishiKosh

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Title Pattern of Sheath blight (Rhizoctonia solani Kuhn) disease development in rice cultivars possessing different degrees of susceptibility
M Sc
 
Creator Harvinder Kumar Singh
 
Contributor Janki Kandhari
 
Subject diseases, rice, biological phenomena, planting, fungi, pathogens, developmental stages, application methods, rhizoctonia solani, crops
 
Description T-8289
.1 Abstract
Sheath blight caused by Rhizoctonia solani Kuhn is one of the important
diseases of rice, resulting in heavy yield loss in rice every year.. The present study was
undertaken to determine the degree of vertical and horizontal spread in terms of relative
lesion height and percent infected tillers respectively. These two parameters are used to
describe the otherwise uncharacterized pathogenicity mechanism of sheath blight
epidemics. Six elite rice cultivars viz. Swarna, Pusa Basmati 1, Pusa 1121, Tetep,
Vikramarya and Pankaj were inoculated with Kapurthala (RS-1), New Delhi (RS-2) and
Moga (RS-3) isolates in open field pot experiments. Based on the results obtained on
inoculation with isolate RS-1 and isolate RS-2 cultivar Swarna was found to be most
susceptible with maximum relative lesion height and cultivar Tetep the most resistant.
Pusa Basmati 1 and Pusa 1121 were either susceptible or moderately susceptible.
Vikramarya and Pankaj were either resistant or moderately resistant. Isolate RS-1 was
found to be the most virulent followed by isolate RS-2. The isolate RS-3 was found least
virulent among the three isolates. The incubation period for the three isolates ranged
from four to seven days. In subsequent study Tetep identified as resistant cultivar in the
earlier study was found resistant to virulent Punjab isolate (RS-4) also. It was also
shown to be consistently resistant to RS-1.
 
Date 2016-10-18T09:44:47Z
2016-10-18T09:44:47Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/80777
 
Format application/pdf
 
Publisher IARI, DIVISION OF PLANT PATHOLOGY