Investigations on Leaf Spot of Greengram Caused by Cercospora canescens Ellis and Martin
| dc.contributor.advisor | Yashoda R. Hegde | |
| dc.contributor.author | Veena | |
| dc.date.accessioned | 2016-11-16T16:17:05Z | |
| dc.date.available | 2016-11-16T16:17:05Z | |
| dc.date.issued | 2012 | |
| dc.description.abstract | Greengram [Vigna radiata (L.) Wilczek], an ancient and well known leguminous crop of Asia, commonly called as mungbean is an important pulse crop of India. Cercospora leafspot is of common occurrence in India. Leaf spot was noticed in all the locations surveyed with the range of 62.25 to 86.18 per cent. The maximum disease severity was noticed in Dharwad district (78.52%) followed by Belgaum district (71.35%) and disease was absent in Bagalkot and Gulbarga districts. Potato dextrose broth was used to study the growth phase of C. canescens. Maximum dry mycelial weight was recorded on 14th day of inoculation. Maximum mycelial growth was observed on Richard’s agar. The temperature of 250C was found to be the best for fungal growth. Maximum vigour index of sorghum was noticed in 16 days old culture filtrate at 200C indicating the maximum toxin production. Among different isolates, Amargola isolate produced more toxin with minimum vigour index. In host extract medium, maximum colony diameter was observed in Amargola isolate and sporulation was observed in Nippani isolate. Sporulation was observed in PDA with 6 and 8 % dextrose and maximum radial growth was observed in 6% dextrose. Among different isolates, the large sized conidia and more number of septa were found in Dharwad isolate. Screening of fifty four genotypes under natural condition revealed that none of the genotype was immune, three cultivars viz., IC 283869, R-86 and RM-8-6 were resistant to leaf spot disease. Under in vitro condition, hexaconazole, mancozeb and mancozeb+ carbendazim were effective fungicides. Ocimum sanctum at 15 and 20% botanical and Trichoderma spp. were able to reduce the growth of pathogen to a remarkable extent. In vivo studies revealed that spraying with 0.1% hexaconazole and difenconazole helped to manage the leaf spot successfully and recorded highest yield and yield parameters. Achook was least effective in managing the leaf spot. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/85974 | |
| dc.publisher | UAS, Dharwad | en_US |
| dc.research.problem | Investigations on Leaf Spot of Greengram Caused by Cercospora canescens Ellis and Martin | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.theme | Investigations on Leaf Spot of Greengram Caused by Cercospora canescens Ellis and Martin | en_US |
| dc.these.type | M.Sc | |
| dc.title | Investigations on Leaf Spot of Greengram Caused by Cercospora canescens Ellis and Martin | en_US |
| dc.type | Thesis | en_US |