Kamanna, B.C.Wahid, S A.2022-02-072022-02-072016-12https://krishikosh.egranth.ac.in/handle/1/5810181798Brinjal (Solanum melongena L.) is one of the important vegetable crop. Collar rot of brinjal caused by Sclerotium rolfsii Sacc. is serious soil borne disease. A study on this was undertaken at the University of Agricultural Sciences, Dharwad during kharif 2015-16. Survey revealed that disease incidence ranged from 2.33 to 24.25 per cent. Highest mean disease incidence (9.75 %) was recorded in black soil. Dhruva hybrid showed high mean disease incidence of 11.52 per cent. . Significantly highest per cent disease incidence of 59.75 was recorded in plants of 15 days old in pot culture studies to know susceptible stage of brinjal. None of the genotypes were found resistant to collar rot pathogen. Among the six systemic fungicides tested under in vitro difenconazole, tebuconazole, hexaconazole and propiconazole at 0.1 per cent and 0.15 per cent concentrations inhibited cent per cent growth of S. rolfsii. Among the five contact fungicides mancozeb at 0.3 % concentration recorded maximum inhibition (60.25 %) of S. rolfsii followed by captan at 0.3 per cent concentration (55.19 %). Combi-products fungicides viz., thiram 37.5 % + carboxin 37.5 % WP and hexaconazole 4 % + zineb 68 % WP at 0.1, 0.2 and 0.3 per cent concentrations inhibited cent per cent o growth of S. rolfsii. Among six bioagents Trichoderma harzianum recorded maximum inhibition. Among thirteen botanicals, parthenium leaf extract recorded maximum inhibition (64.57 %). Among the different treatment combinations tested under pot conditions the combination of seedling dip with thiram 37.5 % + carboxin 37.5 % WP @ 2 g/l + application of FYM @ 200 g/pot + soil application of Trichoderma harzianum @ 4 g/kg followed by soil drenching with thiram 37.5 % + carboxin 37.5 % WP @ 2 g/l on 0, 15, 30, and 45 days after transplanting recorded the least per cent disease incidence (12.04 %).EnglishThesis