Rhizoctonia aerial blight of soybean: Recent techniques of management
| dc.contributor.advisor | Dubey, K.S. | |
| dc.contributor.author | Bisht, Ritu | |
| dc.date.accessioned | 2018-10-23T11:11:09Z | |
| dc.date.available | 2018-10-23T11:11:09Z | |
| dc.date.issued | 2013-06 | |
| dc.description.abstract | Soybean (Glycine max L. Merril) is one of the most important crop in the world today by the virtue of its richness in balanced protein and oil content. Diseases caused by various pathogens are indeed a worldwide important problem in soybean production . Among biotic diseases, Aerial Blight/ web Blight of soybean caused by a fungus i.e. Rhizoctonia solani Kuhn (Teleomorph: Thanatephorus cucumeris (Frank)(donk) is a serious problem in soybean and considered to be menacing and causes heavy losses in yield particularly in warm and humid part of the country. The pathogen is seed-borne,soil-borne as well as wind-borne in nature and it has very wide host range as well as lack of resistance in soybean germplasm to aerial blight has further aggravated the problem, therefore, its management is always challenging.The present investigations were done to study the recent techniques to be used for managing Rhizoctonia aerial blight of soybean. Five strains of Trichoderma harzianum and three strains of Pseudomonas sp. were screened for their antagonistic effect against R.solani.Among fungal antagonists 89-N and LTh-14 showed strongest antagonistic effect against the test fungus,while Th-69 was least effective in parasitizing the test fungus.In case of bacterial antagonists PS F11 was found most effective and potential bio-agent strain in dual culture technique. Among ten organic matter amended soil extracts screened, Pressmud amended soil was found very effective in inhibiting the growth of the test fungus. Out of ten organic matter amended soils and inoculated with R.solani,pressmud increased the seed germination and decreased the seed rot, seedling rot and disease severity.Orange peel showed highest vigour index while maximum nodulation was obtained in green pea manure.The effect of wheat straw was similar to the check. Among the thirteen herbal extracts evaluated against R.solani,bel was found most effective at both the concentrations i.e. 10 % and 20 % while, morpankhi and ginger were found least effective in inhibiting the growth of R.solani.Among seven animal by-products tested cow-urine (old) was found most effective in inhibiting growth of the test fungus while, cow-milk was found least effective. Out of ten essential oils screened, lemon grass,lemon tulsi and peppermint showed 100 % inhibition of mycelial growth of R.solani while, khus and patchouli oil were found least effective. All the essentials oils were also tested at higher concentrations i.e. 500 ppm , 1000 ppm, 1500 ppm , 2000 ppm and 2500 ppm and showed 100 % growth inhibition of the test fungus except khus and patchouli oil. Among the five mineral oils evaluated against the test pathogen ,petrol exhibited maximum growth inhibition of R.solani. Liquid paraffin was found least effective against the test fungus. Tebuconazole and Thiophanate-methyl showed 100 % mycelial growth inhibition at all the concentration i.e. 25 ppm, 50 ppm and 100 ppm and were most effective against R.solani . Thiram was found least effective against the test fungus. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810081975 | |
| dc.keywords | Rhizoctonia, aerial application, blight, soyabeans | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 143 | en_US |
| dc.publisher | G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand) | en_US |
| dc.research.problem | Soyabeans | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.subject | null | en_US |
| dc.theme | Fungal Diseases | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Rhizoctonia aerial blight of soybean: Recent techniques of management | en_US |
| dc.type | Thesis | en_US |