Biological control of rhizoctonia solani kuhn. induced diseases of cowpea
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Date
2008
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Publisher
CCSHAU
Abstract
The Studies on “Biological Control of Rhizoctonia solani Kuhn induced
diseases of cowpea” was carried out under in vitro conditions during 2007-08.
All the bioagents and Bavistin reduced pre emergence damping off significantly
as compare to control. T. harzianum was most effective which reduced disease
control. However, it differed non significantly from other bioagents and
Bavistin. Disease control by bioagents was not affected by inoculum density
significantly. All the bioagents except Rhizobium sp. gave significant reduction
in root rot incidence as compared to control. Bavistin also reduced the disease
significantly (39.72% disease control). Highest disease control (44.19%) was
recorded for T. harzianum.
All the bioagents and bioagents reduced root rot severity compared to
control. T. harzianum was effective in reducing disease severity. Data recorded
for pre-emergence damping off showed no significant difference among
different treatment in case of impact of organic amendments. T. viride, T.
harzianum, B. subtilis and Rhizobium sp. gave 59.08%, 68.18%, 45.95% and
40.91%, disease control in respect of incidence. The efficacy of these bioagents
remained unaffected by organic amendments. All the amendments increased
the efficacy of all the bioagents in reduced diseases severity. Trichoderma
harzianum + neem cake was most effective treatment and reduced disease
scale from 4.03 in control to 1.72.
All the bioagents reduced the cowpea web blight disease incidence and
disease severity significantly at both concentrations. At low concentration, T.
harzianum gave 24.26% disease control. Bavistin spray (0.2%) reduced the
disease incidence from 80% in control to 58.47% which was at par with
bioagents. At higher concentration all the bioagents and Bavistin reduced
cowpea web blight incidence significantly. Minimum disease incidence
(47.14%) as compare to 73.00% in control was recorded for Bavistin. At lower
concentration T. harzianum, B. subtilis and Bavistin were equally effective in
reducing the disease severity. At higher concentration also all the bioagents
and Bavistin reduced disease severity as compare to control.
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Keywords
Manpower, Rice, Tillage equipment, Biological phenomena, Planting equipment, Harvesting, Diseases, Land resources, iIrigation, Weeds