BIOLOGY AND MANAGEMENT OF FALSE SMUT OF RICE [Oryza sativa L.) CAUSED BY Claviceps oryzae - sativae Hashioka IN KARNATAKA

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dc.contributor.advisorANAHOSUR, Dr. K.H.
dc.contributor.authorHEGDE, YASHODA R.
dc.date.accessioned2019-11-05T14:42:32Z
dc.date.available2019-11-05T14:42:32Z
dc.date.issued1999-08-30
dc.description.abstractSystematic studies were carried out on false smut of rice with respect to its survival, perpetuation, cultural studies, life cycle and to develop integrated management strategies. Disease incidence was maximum (23.78%) in Udupi district. Crop sown beyond July 10th suffered least (0%). Weather parameters like lower maximum temperature (<31 °C), minimum temperature (19°C) and higher relative humidity (>90%) during 50 per cent flowering were favourable for the disease development. False smut has significantly reduced the per cent seed germination (25.26%) and 1000 grain weight (48.06%) and increased the chaffiness (40.86%). Healthy seedlings recorded high amount of phenol and ortho-dihydroxy phenol than the seedlings emerged from infected panicles. Chlamydospores germinated by producing one to four conidia in a wide pH range of 4.5 to 8.5. Production of true sclerotia was observed for the first time in Karnataka. True sclerotia germinated on autoclaved moist sand in 30 days at a temperature of 27 + 2°C by producing two to six stromatic heads. Fungus was identified as Claviceps oryzae-sativae and showed maximum radial growth in rice yeast dextrose agar. Chlamydospores and Pseudosclerotia retained their viability upto four and seven months respectively under room temperature. Sclerotia and chlamydospores were the source of survival and perpetuation of the fungus and helped in the disease initiation and disease cycle. Among different methods of inoculation evaluated, spraying of chlamydospore suspension on the inflorescence during flowering was the best method. Carbendazim (0.1%) was the most effective fungicide both under laboratory and field condition. Eucalyptus citriodora leaf extract was effective in inhibiting chlamydospore germination. Out of 80 genotypes screened, Kavya, lESH 1, IR 30864 were free from infection both under natural and artificial condition.en_US
dc.identifier.otherTh-5218
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810134456
dc.keywordsBIOLOGY AND MANAGEMENT OF FALSE SMUTen_US
dc.language.isoenen_US
dc.pages211en_US
dc.publisherUNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALOREen_US
dc.subPlant Pathologyen_US
dc.subjectnullen_US
dc.themeOF RICE [Oryza sativa L.) CAUSED BY Claviceps oryzae - sativae Hashioka IN KARNATAKAen_US
dc.these.typePh.Den_US
dc.titleBIOLOGY AND MANAGEMENT OF FALSE SMUT OF RICE [Oryza sativa L.) CAUSED BY Claviceps oryzae - sativae Hashioka IN KARNATAKAen_US
dc.typeThesisen_US
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