Studies on the management of black scurf of potato caused by rhizoctonia solani kuhn.

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dc.contributor.advisorGandhi, S.K.
dc.contributor.authorPardeep Kumar
dc.date.accessioned2016-12-24T11:07:25Z
dc.date.available2016-12-24T11:07:25Z
dc.date.issued2005
dc.description.abstractThe fungus Rhizoctonia solani Kuhn causing black scurf of potato was isolated and purified. Among seven bioagents evaluated in vitro against R. solani by dual culture method fungal bioagents viz., Trichoderma viride, T. harzianum and G. virens showed their maximum potential at lower pH (5 and 6) while bacterial bioagents viz., Pseudomonas fluorescens, P. maltophila, Bacillus subtilis and Azotobacter chroococcum were more active in the alkaline range. However, T. viride was effective in wide pH range. Similarly when bioagents were tested at different temperature regimes P. maltophila and T. viride showed their potential over a wide temperature range while others were effective in the temperature range of 20-30 oC. On the basis of antagonistic potential of bioagents in vitro five bioagents were selected for evaluation in the field both as seed and soil treatment. Best results in terms of reduction of disease severity were obtained in case of P. maltophila and T. viride. Further both the antagonists increased the tuber yield appreciably in comparison to check. Plant height was not affected by these treatments. Tubertreatment done with few resistance inducing chemicals viz., indole acetic acid, indole butyric acid, salicylic acid, nicotinic acid and benzoic acid at 0.125 and 0.25 per cent concentrations revealed salicylic acid to be most effective in reducing the disease followed by nicotinic acid. At 0.125 per cent concentration reduction in plant height was noticed on IAA and IBA at 30 days after sowing which recovered at 60 days after sowing. Effect of these chemicals on tuber yield were not well marked.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/92598
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subPlant Pathologyen_US
dc.these.typeM.Sc
dc.titleStudies on the management of black scurf of potato caused by rhizoctonia solani kuhn.en_US
dc.typeThesisen_US
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