Browsing by Author "ARUNAKUMARA, K.T."
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ThesisItem Open Access STUDIES ON Altemaria solani (Ellis and Martin) Jones and Grout CAUSING EARLY BLIGHT OF TOMATO(University of Agricultural Sciences GKVK, Banglore, 2007-08-31) ARUNAKUMARA, K.T.; M.S. KULKARNIAn investigation Ccirried out on the early blight of tomato caused by Alternaria solani, indicated that maximum mean severity of the disease was recorded in Belgaum district (63.71) followed by Dharwad district ( 58.71). The fungus grown on PDA produced dark brown mycelium, brown to olivaceous brown conidiophores. with muriform having long beak. Maximum growth was observed on PDA followed by com meal agar. Potato dextrose broth was used to study the growth phase of A. solani. Maximum dry mycelial weight was recorded on 9'^ day of inoculation. Glucose was found to be the best carbon source and threonine was the best nitrogen source for the growth of Arabhavi and Dharwad isolates of A. solont Maximum dry mycelial weight was observed at a pH range of 6.5-7.0 and least at pH 8 in both the isolates. Both the isolates of the pathogen produced maximum growth at 25-30*^C temperature. Morphological variability in colour of colony, margin of colony, topography of colony, colony growth and spomlation was observed among six isolates of A. solanL Two isolates namely ASl (Arabhavi) and AS3 (Amminabhavi) produced good sporulation in PDA supplemented with 1% CaCOa. The fungus survived in infected crop debris up to 180 days when stored under laboratory conditions and upto 120 days under refrigerated and glasshouse conditions.