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Title: Management of brown spot disease of rice caused by Helminthosporium aryzae Breda de Haan in Allahabad agroclimatic condition
Researcher: Kamei David
Guide(s): Sobita Simon
Keywords: Agricultural Sciences
Agriculture Multidisciplinary
Life Sciences
University: Sam Higginbottom Institute of Agriculture, Technology and Sciences
Completed Date: 2020
Abstract: newline Five indigenous plants of Manipur viz., Flogacanthus thyrsiflorus, Mariandra benghalensis, newlineMillettia pachycarpa, Alliumhookerii and Solanum incanum were screened in-vitro at different newlineconcentration i.e., 10%, 15% and 20% against the radial growth of Helminthosporium oryzae, newlineand found maximum per cent inhibition on biomass production in broth media was at 20% newlineconcentration in S. incanum (58.58) followed by A. hookerii (44.72). In solid media maximum newlineper cent reduction on radial growth was recorded in S. incanum (53.29) and A. hookerii (44.29) newlinein compared with the control.The in-vivo test of consecutive two cropping seasons (2014-15) and newline(2015-16), found that maximum reduction in per cent disease incidence (PDI) of H. oryzae was newlinein S. incanum (39.68) followed by A. hookerii (31.36) in compared o other treatments including newlinecontrol. Among the botanicals maximum grain yield were recorded in S. incanum3.37 (t/ha.), newlinefollowed by A. hookerii (3.27 t/ha.). It was found that all treatments significantly increased yield newlinein compared with the untreated control. Investigation were also carried out to evaluate the newlineefficacy of selected fungicides viz., Thiophanate, Myclobutanil, Carbendazim, Propineb, newlinePropiconazole and bio-agent (Pseudomonas fluorescens) against Helminthosporium oryzae. The newlinein-vitro test results revealed that among the selected fungicides best per cent inhibition on fungal newlinebiomass production was recorded in Propiconazole (85.71) followed by Propineb (80) in broth newlinemedia, in solid media test maximum per cent inhibition on radial growth was recorded in newlinePropiconazole (74.26) followed by Propineb (73.04) over the control. The antagonistic effect of newlinePseudomonas fluorescens on dual culture test revealed maximum reduction on linear growth of newlineH. oryzae was recorded in cell concentrations (1.37x108)/ml, with (52.23%) reduction over newlinecontrol. The in-vivo trial revealed that maximum reduction of per cent disease incidence (PDI) newlinewas in Propiconazole (72.39) followed by Propineb (69.40), Myclobutanil (63.52) and
Appears in Departments:Department of Plant Pathology

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