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1800 - 199968
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Subject: Plant Pathology × End date: 1999 × Thesis Type: M.Sc ×
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Now showing 1 - 9 of 69
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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
    DIFFERENTIATION OF STRAINS OF Drechslera nodulosa (Berk, and Curt.) SUBRAM AND JAIN CAUSING BROWN SPOT OF FINGER MILLET AND IT’S MANAGEMENT
    (University of Agricultural Sciences, Dharwad, 1999) B G, KALAVATHI; VISWANATH, S
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON SUNFLOWER NECROSIS DISEASE
    (University of Agricultural Sciences, Dharwad, 1999) HALAKERI, ANAND V; BYADGI, A S
    Sunflower necrosis disease, causing considerable damage to the crops, is a serious disease and present in almost all parts of Northern Karnataka wherever sunflower in grown. Affected plants were characterized by production of mosaic and chlorotic ringspots. In extreme cases the affected leaves developed marginal necrosis with reduction in leaf size. In later stage of disease development, affected plants produced mgdformed head and seeds of poor quality. The virus causing necrosis disease in sunflower was sap transmissible but not with ease. It was not transmitted through seeds and dodder. The virus was transmitted by thrips (Thrips fabad) vector from sunflower to sunflower and to tomato. But not by aphids, jassids and whiteflies. The virus had a narrow host range and infected only 3 plant species among 15 different hosts tested belonging to 6 families. The virus had DEP between 10 ^ to 10^, TIP between 35° to 40°C and retained infectivity upto 2 hours at room temperature. Based on symptoms, host range, transmission and physical properties, it was concluded that the sunflower necrosis disease in this area, is probably caused by member of Tomato spotted wilt virus (Tospovirus) group. In early infected crop (15 days after sowing) the disease had a severe effect on yield and yield parameters. The disease reduced yield of sunflower to a tune of 90.86 percent when appeared in early stage of the crop growth as compared to 31.69 percent when appeared late. Field trials indicated that the spread of the disease could be minimized by spraying Imidacloprid (0.025%) insecticide. None of the 56 sunflower hybrids screened were resistant to virus infection, but hybrid UH-32 and 7 others exhibited some tolerant properties.
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    ThesisItemOpen Access
    Studies on etiology, characterisation and management of wilt of Bird-of-paradise (Strelitzia reginae Banks.)
    (University of Agricultural Science, Dharwad, 1999) Shubalaxmi, P T; Nazir Ahmed Khan, A
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON FOLIAR DISEASES OF SESAME
    (University of Agricultural Science, Dharwad, 1999) Shekarappa, G; Patil, P V
    "Among several foliar diseases affecting sosaine corp alternaria leaf spot caused by Altemaria sesami and white spot caused hy Cercospora sesami has become a major constraint in sesame cultivation. Therefore, these foliar diseases have been studied in detail with different objectives with an ultimate aim of the control of these diseases. Survey revealed that maximum disease severity of Altemaria leaf spot was recorded from Dharwad taluk of Dharwad district and Basavakalyan taluk of Bidar district. Among the 172 sesame genotypes including three wild species screened against foliar diseases under filed conditions, three wild species viz, Sesamum malabaricum, S. occidentalis and 5"". radiatiim were found resistant and 12 genotypes ( Kalika, DORS-2 DS-9, 10, 28, 57, Bijapur local (brown), Tarikeri local, BSG-26, Kudalagi local, Madhavi and AVT-13) showed moderately resistant reaction to Altemaria leaf spot. In case of in vitro evaluation of nine fungicides, mancozeb and Azadirectin @ 0.3%, difenconazole and propiconazole @ 0.1% against Altemaria sesami and carbendazim @ 0.1% and mancozeb @ 0.3% against Cercospora sesami were found most effective. Copper oxychloride and Azadirectin (Nimbicidine) at all the concentrations tested were found least effective in inhibition of mycelial growth of both the fungi. In field evaluation of ten chemicals, 3 sprays of mancozeb (0.3%) + streptocycline (0.25%) combination and mancozeb (0.3%) alone have significantly reduced the severity of foliar diseases and increased the seed yield and oil content."
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    ThesisItemOpen Access
    ASSESSMENT OF YIELD LOSSES DUE TO ROOT – KNOT NEMATODE, Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949 ON SUNFLOWER (Helianthus annuus L.) AND ITS MANAGEMENT
    (University of Agricultural Science, Dharwad, 1996) Devappa, V; Krishnappa, K
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    TRANSMISSION, PURIFICATION AND DETECTION OF FIELD ISOLATES OF CARDAMOM MOSAIC VIRUS (KATTE VIRUS) IN CARDAMOM [Elettaria cardamomum (L.) Maton]
    (University of Agricultural Science, Dharwad, 1996) Padmaja, A S; Muniyappa, V
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STANDARDIZATION OF VARIOUS CHEMIGATION METHODS IN THE MANAGEMENT OF ROOT - KNOT NEMATODE, Meloidogyne incognita ON TOMATO
    (University of Agricultural Science, Dharwad, 1996) Prasanna, T B; Krishnappa, K
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    MANAGEMENT OF PANAMA DISEASE OF BANANA CAUSED BY Fusarium oxysporum f. sp. Cubense BY USING MICROORGANISMS
    (University of Agricultural Science, Dharwad, 1996) Satheesh, S; Urs, Shantha D
    ABSTRACT NOT AVAILABLE