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Subject: Plant Pathology × Author: Anjaneya Reddy, J.C. × End date: 2012 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Biological control of rhizoctonia solani kuhn. induced diseases of cowpea
    (CCSHAU, 2008) Anjaneya Reddy, J.C.; Hari Chand
    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.