VARIABILITY STUDIES OF Rhizoctonia solani CAUSING SHEATH BLIGHT IN RICE AND ITS MANAGEMENT
| dc.contributor.advisor | Narendrappa, T. | |
| dc.contributor.author | KIRAN KUMAR, N. | |
| dc.date.accessioned | 2021-09-21T10:16:28Z | |
| dc.date.available | 2021-09-21T10:16:28Z | |
| dc.date.issued | 2018-07-01 | |
| dc.description.abstract | Sheath blight caused by Rhizoctonia solani is one of the most destructive diseases in rice contributing to significant yield loss. Morphological variability of twenty isolates of R. solani from rice revealed maximum hyphal width of 7.21 μm in the isolate MYRS 1and the minimum hyphal width of 3.45 μm was observed in HARS 1. The highest mycelial growth of 54.8 mm was noticed in MYRS 3 and the least growth was observed in MYRS 2 (15.8 mm). The twenty isolates under study except HARS 7 produced sclerotial bodies and many produced dark brown, micro sized and separate sclerotia on the surface of the medium. The highest relative lesion length of 51.2% was observed in MARS 5 and the least relative lesion length was observed in HARS 7 (10.5%). The genetic diversity of twenty R. solani isolates using 19 ISSR markers showed 100 per cent polymorphism and were grouped into 5 clusters. The R. solani isolates recorded negative infectivity on ragi, maize, jowar and tomato plants except MYRS 1, MYRS 2, MARS 2, MARS 6 and HARS 1 isolates that showed infectivity on beans. The highest in vitro inhibition of growth of R. solani (51.1%) was observed in cabbage and the least inhibition was 21.93% with radish at 1:1 dilution. The highest inhibition of growth of R. solani was observed in Trichoderma viride (38.88%) and the least inhibition was noticed in case of Pseudomonas fluorescens and Bacillus subtilis which recorded 18.88% inhibition over control. Foliar application of propiconazole 25 EC @ 0.1 % at 30 DAT and 60 DAT was found most effective in suppressing the disease (3.70%) followed by soil application of mustard leaf @5 g/100 g soil before transplanting and foliar application of P. fluorescens @ 5 g/L at 30 DAT (6.48%). Under field evaluation, foliar application of propiconazole 25 EC @ 0.1 % at 30 DAT and 60 DAT was most effective with least mean disease severity (12.59%) with highest yield (4992 kg/ha) followed by soil application of mustard leaf @ 5 kg/plot before transplanting and foliar application of P. fluorescens @ 5 g/L at 30 DAT with 17.77% mean disease severity and 4433 kg/ha yield. | en_US |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810176008 | |
| dc.keywords | Rhizoctonia solani | en_US |
| dc.language.iso | English | en_US |
| dc.pages | 152 | en_US |
| dc.publisher | University of Agricultural Sciences, Bangalore | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.theme | CAUSING SHEATH BLIGHT IN RICE | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | VARIABILITY STUDIES OF Rhizoctonia solani CAUSING SHEATH BLIGHT IN RICE AND ITS MANAGEMENT | en_US |
| dc.type | Thesis | en_US |