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ThesisItem Open Access Studies on the production of toxic metabolites by Trichoconis padwickii ganguly in culture filtrate(Division of plant Pathology ,Agricultural College and Research Institute ,Vellayani, Trivandrum, 1969) Jayachandran Nair, K; KAU; Sam Raj, JThesisItem Open Access Effects of collar mot and ring-barking on the Rhizosphere microflora and certain chemical constituents of sword bean plants(Division of plant Pathology ,Agricultural College and Research Institute ,Vellayani, Trivandrum, 1968) Kanakambaran, P N; KAU; Sam Raj, JThesisItem Open Access Air spora over rice crop with special reference to Piricularia oryzae Cav.(Division of plant Pathology ,Agricultural College and Research Institute ,Vellayani, Trivandrum, 1967) Maheswari Amma, S; KAU; Sam Raj, JThesisItem Open Access Mosaic disease of Dolichos bifforus L., transmission , host range and effect of the virus on the host(Division of plant Pathology ,Agricultural College and Research Institute ,Vellayani, Trivandrum, 1967) Sukumara Dev, V P; KAU; Sam Raj, JThesisItem Open Access Studies on certain chemical constituents of banana leaves in relation to incidence of leaf spot diseases. A note on the fungi occurring on banana(Division of Plant Pathology ,Agricultural College and Research Institute ,Vellayani, Trivandrum, 1966) Chandrasekharan Nair, M K; KAU; Sam Raj, JThesisItem Open Access Studies on the helminthosporium Disease of rice detection of mycelium of the fungus in different tissues of the seed obervations on a saltant of Helminthosporium oryzae.(Division of plant Pathology ,Agricultural College and Research Institute ,Vellayani, Trivandrum, 1965) Krishnan Kutty Nair, M R; KAU; Sam Raj, JThesisItem Open Access Observations on Trichoconis padwickit Ganguly with special reference to its pathogenicity(Division of Plant Pathology, Agricultural College & Research Institute, Vellayani, 1967) Vinayaga Murthi, A; KAU; Sam Raj, JOat-meal agar with yeast tablets was found to be a good medium for the sporulation of Trichoconis padwiokii, while mycelial growth of the fungus was better in potato dextrose agar. Spores of Trichoconis padwickii germinated by the production of germ-tubes from any of the cells but more frequently from the end cells. Germination was equally good on tap water, distilled water, rain water and leaf extract.ThesisItem Open Access Rhizosphere microflora of tobacco influence of tobacco mosaic virus and certain chemicals on the microbial population(Division of Plant Pathology, Agricultural College & Research Institute, Vellayani, 1967) Balakrishnan, S; KAU; Sam Raj, JA definite rhizosphere population was found to be establishedin the tobacco plants, within three days of germination of seeds. The population steadily increased with the age of plants till flowering stage, after which there was a gradual decline in all the three groups of microorganisms namely, bacteria, actinomycetes and fungi. The microbial population in the rhizosphere was significantly higher than that in the control soils at all stages of plant growth.ThesisItem Open Access Observations on some common species of alternaria with special reference to the influence of substrate on size of conidia(Division of Plant Pathology, Agricultural College & Research Institute, Vellayani, 1967) Sukumara Varma, A; KAU; Sam Raj, JCultural, physiological and pathogenicity studies of Alternaria species causing leaf spot disease on seven different host plants have been made. of these Hibiscus Rosa-sinensis is a new record for Alternaria in India. All the isolates grew and sporulated on the different solid media tried. But grouth and sporulation on potato dextrose agar were found to be uniformly good.Minimum radial growth of all the isolates was obtained on their respective host leaf extract agar media. Sporulation was also satisfactory in this media. The isolates from Basella and on onion showed pigment production on Czapek's agar medium