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STUDIES ON GRAIN SMUT OF BARNYARD MILLET [Echinochloa frumentacea (Roxb.) Link.]
| Content Provider | KrishiKosh-Indian National Agricultural Research System |
|---|---|
| Advisor | Nagaraja, A. |
| Researcher | Erayya |
| Abstract | Grain smut caused by U. panici-frumentacei is deleterious disease on barnyard millet, which causes damage to the crop both in terms of quality and quantity. The studies conducted on symptomology, morphology, physiological and nutritional requirements of the fungus, inoculation techniques, screening vis-a vis in vitro and in vivo evaluation of different fungicides and bioagents for the control of smut fungus revealed that, the fungus U. panici-frumentacei was ovaricolous. The size of the infected grain increases two to five fold of normal size of the grain. The spores were brown, spherical to subspherical measuring 6.25 to 11.25 im in diameter. Spore germination was high (71.79%) in two per cent sucrose solution. Dry mycelial weight of fungus was high (126.44mg) at twenty days after inoculation. The radial growth of fungus was highest on potato dextrose malt extract peptone agar. The growth of fungus was highest at pH 6.0 and the least at pH 8.5. The fungus performed best at 28oC followed by 32oC. The fungus preferred xylose and glycine as carbon and nitrogen sources for better growth. Panicle inoculation with sporidial suspension was found to be the best technique for barnyard millet grain smut with 8.33% disease incidence. Under in vitro conditions fungicides such as difenconazole, propiconazole and carbendazim were found effective with complete inhibition of the fungus. Among the bioagents, combination of Trichoderma harzianum + Pseudomonas fluorescens inhibited 75.63 per cent fungal growth. whereas under field conditions spray with fungicides viz., difenconazole (0.5ml/l) and propiconazole (1ml/l) resulted in 89.67 and 81.88 per cent reduction in disease incidence respectively. Among the 797 accessions screened for their reaction to grain smut, 57 were immune, 343 highly resistant, 210 resistant, 108 moderately resistant, 54 susceptible and 25 were highly susceptible. The disease incidence among the accessions varied from 0.00 to 54.05 per cent. |
| Page Count | 88 |
| File Size | 5426586 |
| File Format | |
| Language | English |
| Publisher | University of Agricultural Sciences GKVK |
| Publisher Place | Bangalore |
| Access Restriction | Open |
| Subject Keyword | Plant Pathology Barnyard Millet |
| Content Type | Text |
| Educational Degree | Master of Science (M.Sc.) |
| Resource Type | Thesis |
