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Subject: Plant Pathology × End date: 2013 × Type: Thesis × Thesis Type: Ph.D ×
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Now showing 1 - 9 of 69
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    ThesisItemOpen Access
    STUDIES ON ZONATE LEAF SPOT OF SORGHUM CAUSED BY Gloeocercospora sorghi D. Bain & Edg
    (University of Agricultural Sciences, Dharwad, 2001) PALAKSHAPPA, M G; HIREMATH, R V
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    BIOLOGICAL CONTROL OF CHARCOAL ROT OF SORGHUM [Sorghum bicolor (L .) Moench] CAUSED BY Macrophominaphaseolina (Tassi) Goid
    (University of Agricultural Sciences, Dharwad, 2000) DESAI, SUNIL A; KULKARNI, SRIKANT
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    DEVELOPMENT OF BIO-INTENSIVE INTEGRATED MANAGEMENT STRATEGIES AGAINST ROOT-KNOT NEMATODE Meloidogyne incognita (KOFOID AND WHITE) CHIT WOOD INFECTING TOMATO
    (University of Agricultural Sciences, Dharwad, 1999) RAMASWAMY, S D; PARVATHAREDDY, P
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    INTEGRATED MANAGEMENT OF PHYTOPHTHORA FOOT ROT OF BLACK PEPPER THROUGH VA MYCORRHIZA AND HOST PLANT RESISTANCE
    (University of Agricultural Sciences, Dharwad, 2000) Lokesh, M S; Anahosur, K H
    The black pepper vines of both cultivated and vines in the forest areas are invariably associated with the native isolates of VA mycorrhiza viz., Glomus fasciculatum and Acaulospora sp. The native isolates VA mycorrhiza were effective in combating the Phytophthora foot rot of black pepper alone and its effects is synergestic when integrated with either Trichoderma viride or potassium phosphonate (Akomin, @ 0.3 per cent). The cuttings of black pepper viz., Vokkalu , Mottakare, Thirupukare showed least incidence of disease when the cuttings were preinoculated with native isolates of VA mycorrhiza then challenged with Phytophthora capsici. Vokkalu type 1 and 2, Uddakare accession 1 and 2, Thimpukare, Balankotta - II, Neelamundi-ll, Narayakodi-IV and Kudargutta showed tolerance to P. capsici at lower inoculum potential i.e., 25 zoospores/vine. The explant initiated the callus in presence of 0.5 mg I-1 BA in combination with either 1.0 mg I-1 2,4-D or 2.0 mg I-1 NAA or IBA or lAA whereas, the callus could be easily maintained in half strength MS medium supplemented with 1.0 mg I-1 2,4-D. Callus of cultivars viz., Vokkalu type-1 and 2 are having slight tolerance at one per cent toxic metabolites of Phytophthora capsici The shoot tip explant of Uddakare and Thimpukare produced multiple shoots in half strength MS medium with 2.0 mg 1 BA and 0.01 mg I-1 NAA. NAA (1.0 mg 1-1) and IBA (1.0 mg I-1) were found effective in rooting of the shoot. Micro propagated plantlets of black pepper were hardened by planting in 1:1 sand and coir pith in humid chamber for 30 days.
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    ThesisItemOpen Access
    MANAGEMENT OF WILT AND ROOT ROTS OF COTTON WITH SPECIAL REFERENCE TO BIO FUNGICIDES
    (University of Agricultural Sciences, Dharwad, 2002) CHATTANNAVAR, S N; KULKARNI, SRIKANT
    Survey was revealed that wilt caused by Fusarium solani up to 20 per cent followed by Rhizoctonia solani and Rhizoctoina bataticola up to six percent and Sclerotium rolfsii was negligible. Among nine isolates of F. solani, the Raichur isolate was more virulent.Among twelve cultures of Trichoderma and two cultures of Gliocladium virens against all four pathogens. T. harzianum of Dharwad isolate was the best and G. virens of TNAU was the best. In growth period studies, T. harzianum reached its peak on 12th day and maltose and dextrose were best to support the growth. Transparent polythene bag was superior. Among substrates wheat bran was superior. In seed treatments, @ 8g/kg of seed and among soil applications, three percent was superior. In the combination, seed treatment @ 8g/ kg with 1% soil applicaiton was superior. Among agro chemicals tested for both T. harzianum and pathogens, the fungicides, carbendazim and benomyl were inhibitory to T. harzianum. Benomyl and carbendaizim were excellent to control F. solani. Similarly, benomyl, methoxy ethyl mercury chloride (MEMC), carboxin, thiram and MEMC were superior to control R. solani and R. bataticola respectively. For S. rolfsii, carboxin was the best. Among insecticides, chlorpyriphos was inhibitory to T. harzianum followed by imidachloprid. Endosulfan was least inhibitory. Carbofuran, phorate and endosulfan were less effective to pathogens. Among herbicides, alachlor was more deletorius than paraquat. Diuron was effective against all four pathogens. Among organic amendments neem cake was superior in suppressing the growth of all four pathogens. In storage studies, increase in temperature lowered cfu and at 0°C it was maximum and wheat bran was the best and can be stored upto five months. Culture filtrates of all twelve Trichoderma and two G. virens on seed germination of Jayadhar and Abhadita with delinted and fuzzed seeds revealed that delinted seeds had better germination and culture filtrates enhanced seed germination.
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    ThesisItemOpen Access
    STUDIES ON RACES, ECOLOGY, DETECTION AND CONTROL OF Xanthomonas campestris pv. vesicatoria (Doidge) Dye CAUSING BACTERIAL SPOT OF TOMATO (Lycopersicon esculentum Mill.)
    (University of Agricultural Sciences, Dharwad, 1997) RAVI KUMAR, M R; Nazir Ahmed Khan, A
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    INTERACTION OF Fusarlum oxysporum f. sp. Ciceri WITH Meloidogyne incognita ON Cicer arietinum L. AND THEIR MANAGEMENT
    (University of Agricultural Sciences GKVK, Bangalore, 1994) Krishna Rao, V; Krishnappa, K
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON PHYLLODY OF PLANTS WITH SPECIAL REFERRENCE TO PIGEONPEA [ Cajanus Cajan ( L.) Millsp.
    (University of Agricultural Sciences GKVK, Bangalore, 1993) Suryanarayana, V; Reddy, H R
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON SOME ASPECTS OF SOYBEAN RUST CAUSED BY Phakopsora pachyrhizi Syd.
    (University of Agricultural Science, Dharwad, 1999) Hundekar, Appasab R; Hiremath, P C
    "Studies on soybean rust revealed that disease was wide spread in severe form (64.99%) on soybean in Northern Karnataka and parts of Maharashtra during kharif 1996, 1997 and 1998. Onset and more severity were recorded in villages situated on Krishna River Bank and are considered as hot spots of disease. Deposition of uredospores on slide kept in aeroscope commenced 6 to 9 days before onset of disease. Fluctuations in uredospore deposition were observed. More uredospores were trapped between 75 to 90 DAS and rust severity was maximum at this stage. Autoregression model of seventh order was found to be accurate for prediction of uredospores load in atmosphere. Logistic model and linear environmental model were appropriate for predicting rust epidemics. Uredospores survived for 12 to 15 days in infected host debris. Disease prevailed on soybean throughout the year with difference in severity. Cowpea, pea, greengram, horsegram, redgram and frenchbean were found to be collateral hosts. Onset of rust was delayed on early sown crop and severity increased with delayed sowing in kharif. Drastic reduction in yield and seed weight was recorded with delayed sowing. Among the varieties PK-1029 recorded the least severity with all the sowing periods. Among germplasms S-22, WC-12 and 92-10 performed better in yield with resistant reaction. Among varieties PK-1162, PK-1029, JS-80-21 and PK-1024 showed moderately resistant reaction with good yield. Three and two sprays of hexaconazole (0.1%) were required to manage rust on a susceptible {JS-335) and a moderately resistant (PK- 1029) varieties respectively. Yield loss of 81.94 and 65.73 per cent due to rust was observed with JS-335 and PK-1029 respectively. Yield loss model could be developed by using AUDPC as input variable. Severity at 75 and 85 DAS was highly significant and positively correlated with yield loss in JS-335 and PK-1029 respectively."