Integrated Management of Root Rot of cotton caused by Rhizoctonia solani (Kuhn.)
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Date
2018
Authors
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Publisher
MPUAT, Udaipur
Abstract
Integrated Management of Root Rot of Cotton Caused by
Rhizoctonia solani (Khun.)
Ramniwas Yadav* Dr. R. N. Bunker The present study was undertaken on integrated management of root rot of
cotton caused by Rhizoctonia solani to know the disease incidence; survey was
carried out during 2017 in 18 villages of different six cotton growing district viz.,
Udaipur, Hanumangarh, Sri Ganganagar, Chittorgarh, Banswara and Dungarpur. The
per cent mortality in the surveyed area was ranged from 12.29-28.36. The maximum
28.36 per cent was recorded in Bhadwalo (Sri Ganganagar) and minimum 12.29 per
cent in Borwat village of Banswara district.
Root rot pathogens (R. solani) were isolated in majority from diseased cotton
plants showing root rot symptoms collected from farmer’s field during survey. The
pathogenicity of recovered isolates of R. solani were separately confirmed by Koch’s
postulates by growing susceptible cotton cultivar “Jai BG-II” in pathogen inoculated
pots also observed incidence and typical symptoms by respective isolates.
Cultural and morphological variability of each isolates was tested under
laboratory condition to find out the aggressiveness of the pathogens (isolates) and
results find out that isolate SNG Rs-03 from Sri Ganganagar was the most virulent
compare to other isolates. Pathogenic variability and disease symptology among six
isolates was test on cotton cultivar “Jai BG-II” growing in cage house and results
observed that isolate from Sri Ganganagar (SNG Rs-03) highly aggressive with high
degree of symptoms.
Six fungicides were evaluated at 50, 100, 250 and 500 ppm concentrations, for
their efficacy against R. solani resulted that Carbendazim was found most effective at
all concentrations. Among biocontrol agents Trichoderma viride (T-5) was found
most effective against R. solani in dual culture technique.
* Post Graduate student, Department of Plant Pathology, R.C.A., MPUAT, Udaipur
** Assistant Professor, Department of Plant Pathology, R.C.A., MPUAT, Udaipur.
Integration of Carbendazim (ST) + T. viride + neem cake (both as soil
application) resulted in significantly highest per cent seed germinations (73.0) and
lowest plant mortality (5.5 per cent) over their individual application. It would
therefore help to work out integrated management strategy to reduce indiscriminate
use of fungicides to reduce the chance of development of resistance against
fungicides.
Description
Integrated Management of Root Rot of Cotton Caused
Keywords
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Citation
Yadav, R. and Bunker, R.N.