Epidemiology and management of soybean root rot caused by rhizoctonia solani kuhn
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Date
2007
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Publisher
CCSHAU
Abstract
The studies on “Epidemiology and management of soyabean
Root rot caused by Rhizoctonia solani Kuhn.” was carried out under in vitro
conditions during 2005-06.
Inoculum amount @ 3 g/lit. of water induced maximum disease
severity (35.23%). Seven days old inoculum was found more virulent (48.23%
disease severity) among the others (3, 5, 10 and 12 days old). Plants younger
in age (7 days) were found more susceptible to the pathogen (54.38% disease
severity). Minimum disease severity was recorded in treatment N15P24. It
reduced the disease from 26.43% in control to 17.66%. FYM gave 5.39%
reduction in disease severity as compared to control.
None of the genotypes screened against the pathogen in screen
house and in laboratory by tissue culture method, was found resistant to the
disease. Minimum disease severity (20.33%) was observed in the genotype
SH40. Among the four bio-agents tested for the control of disease under
screen house conditions Trichoderma viride was found to be the most effective
which reduced disease severity from 52.56% in control to 17.89%. In dual
culture method of testing bioagents also T. viride gave highest reduction in
radial growth (79.33 percent inhibition and percent overlapping was 67.22).
Among the five organic amendments tested for the control of root rot Neem
was found to be most effective. It reduced the disease from 52.48% in control
to 25.44%.
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Keywords
Soybean, Rhizoctonia solani, Trichoderma viride, Trichoderma harzianum, Trichoderma virens, Bacillus subtilis, disease severity, Callus and tissue culture