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Subject: Plant Pathology × End date: 2013 × Type: Thesis ×
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Now showing 1 - 9 of 334
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    ThesisItemOpen Access
    Studies on Fungal and Bacterial Endophytes of Soybean (Glycine max (L.) Merrill) Against the Soilborne Pathogens
    (University of Agricultural Sciences, Dharwad, 0200) Brunda, K.S.; Jahagirdar, Shamarao
    A total of 30 fungal and 30 bacterial endophytes were isolated from healthy soybean plants during kharif 2017 from major soybean growing areas of northern Karnataka viz., Belagavi, Haveri, Bidar, Dharwad and parts of Maharashtra viz., Kolhapur and Sangli districts. Maximum number of endophytes were obtained from Belagavi district (21) followed by Dharwad district (15). Mean maximum endophyte association was observed in irrigated condition (1.38 for fungal and 1.63 for bacterial endophytes), black soil (1.31 for fungal and 1.46 for bacterial) and at vegetative stage (1.73 for fungal and 1.27 for bacterial). In dual culture method of screening, the endophytes RF-BV-3, SF-DM-8, RB-KK-6, SB-BS-6 and LB-BU-1 were effective against Sclerotium rolfsii and the isolates SF-DM-8, SB-DG-11 and LB-BiN-8 were effective against Rhizoctonia bataticola. The effective endophytes against Fusarium oxysporum were RF-BV-3, SF-BV-3, SF-DM-8, SF-DS-10, LF-HH-5, LF-DM-10, LF-DD-13, LF-KK-14, RB-HS-1, SB-BiJ-9, LB-BU-1 and LB-BV-2. Based on cultural, morphological and molecular methods, the effective fungal endophytes were identified as Daldinia eschscholtzi (RF-BV-3), Fusarium solani (SF-BV-3 and LF-KK-14), Neofusicoccum parvum (SF-DM-8), Diaporthe phaseolorum (SF-DS-10 and LF-HH-5), Phomopsis sp. (LF-DM-10) and Colletotrichum aenigma (LF-DD-13). The effective bacterial endophytes were identified as Acinetobacter sp. (RB-HS-1), Alcaligenes faecalis (RB-KK-6), Stenotrophomonas sp. (SB-BiJ-9), Bacillus pumilus (SB-DG-11 and LB-BiN-8), Paenalcaligenes sp. (LB-BU-1), Bacillus cereus (SB-BS-6) and Brevibacillus sp. (LB-BV-2). Under glasshouse studies, SF-DM-8 was effective against all the three pathogens (less disease incidence of 21.88 % against S. rolfsii, 27.50 % against R. bataticola and 25.00 % against F. oxysporum) and showed enhanced growth promotion activity (increased plant height, leaflet number etc.) with maximum disease incidence of 100 per cent in untreated check. The endophyte RB-KK-6 was effective against S. rolfsii with less disease incidence (31.25 %). The endophytes RF-BV-3 and SB-BiJ-9 were effective against F. oxysporum with minimum disease incidence of 16.67 per cent.
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    ThesisItemOpen Access
    STUDIES ON WILT COMPLEX OF BETELVINE (Piper betle Linn.)
    (University of Agricultural Sciences, Dharwad, 2003) PARAMESHWARI, B; LINGARAJU, S
    A survey on the occurrence of root-knot disease in Haveri, Koppal and Bagalkot districts revealed 0.0 to 86.7 per cent root knot disease incidence. The present survey also indicated the association of Meloidogyne spp. with fungi, namely, Sclerotium rolfsii, Rhizoctonia bataticola and Fusarium solani in most of the locations surveyed, with a high frequency of occurrence of both the groups of these pathogens (nematode and either of the three fungi) from soil and root samples collected from Haveri district. Meloidogyne spp. were found to be the most predominant nematode pathogen associated with betelvine as revealed by a community analysis of plant parasitic nematodes. On the basis of perineal patterns, prevailing root-knot nematode was identified as M. incognita. Pathogenicity tests confirmed that M. incognita, S. rolfsii, R. bataticola and F. solani were pathogenic to betelvine. The effect of the simultaneous inoculations of M. incognita with either S. rolfsii or R. bataticola or F. solani on growth of betelvine cv. Ambadi was additive in nature. However, when M. incognita was inoculated with all the three fungi, the resultant effect was more than simple additive effect. Individually, S. rolfsii was the most aggressive pathogen followed by R. bataticola, F. solani and M. incognita. Occurrence of M. incognita in combination with S. rolfsii, R. bataticola and F. solani, not only increased the severity of disease but also shortened the incubation period for disease expression. A reduction in root-knot index and final nematode population was observed in various combinations of nematode and fungi inoculations. In an integrated management study conducted in a naturally affected betelvine garden, it was found that a combined application of an organic amendment (Enriched farmyard manure) with a biocontrol agent (Trichoderma viride) and chemicals (Carbofuran, Carboxin and Carbendazim) was found to be efficaceous in reducing the wilt-complex incidence, nematode population, number of galls and Competitive Saprophytic Ability of S. rolfsii and R. bataticola.
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    ThesisItemOpen Access
    STUDIES ON PIGEONPEA STERILITY MOSAIC DISEASE AND ITS MANAGEMENT
    (University of Agricultural Sciences, Dharwad, 2000) TIRUMALA KUMAR; RANGASWAMY, K T
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    EVALUATION OF JAMUN SEEDLING PROGENIES AND STANDARDISATION OF SOFTWOOD GRAFTING
    (University of Agricultural Sciences, Dharwad, 2001) PRABHURAJ, H S; HULAMANI, N C
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    EPIDEMIOLOGY AND CROP LOSS ASSESSMENT OF STERILITY MOSAIC VIRUS DISEASE OF PIGEONPEA (Cajanus cajan (L.) Millspaugh) IN NORTH-EASTERN KARNATAKA
    (University of Agricultural Sciences, Dharwad, 2002) PRAMOD BABU K., K; NARAYANA, Y D
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    MANAGEMENT OF POST HARVEST DISEASES OF MANGO (Mangifera indica L.)
    (University of Agricultural Sciences, Dharwad, 2001) PRASANNA KUMAR, M. K.; NARGUND, V. B.
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON EPIDEMIOLOGY AND MANAGEMENT OF LEAF BLIGHT OF SESAME CAUSED BY Alternaria sesami (Kawamura) Mohanty and Behera
    (University of Agricultural Sciences, Dharwad, 2001) SRINIVASA REDDY, M R; NARAYANA, Y D
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON VARIABILITY, PRE-AND POST-HARVEST MANAGEMENT OF EARLY BLIGHT [Alternaria solani (Ell. and Martin) Jones and Grout] OF TOMATO
    (University of Agricultural Sciences, Dharwad, 2002) PRASAD, Y; NAIK, M K
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    MANAGEMENT OF DRY ROOT ROT OF PIGEONPEA (Cajanus cajan (L.) Millsp.| CAUSED BY Macropliomina phaseolina (Tassi) Goid.
    (University of Agricultural Sciences, Dharwad, 2002) LOKESHA, N. M.; BENAGI, V. I.
    ABSTRACT NOT AVAILABLE