Castor is one of the important non edible oilseed crop in India. The present investigation was undertaken with the main objective to determine detection on seed-borne Cladosporium oxysporum and its pathogenicity were conducted at Department of Applied Botany, Plant Pathology laboratory, Kuvempu University, Jnanasahyadri, Shankaraghatta, Shivamogga, Karnataka. The objective of this work was to estimate the incidence of C. oxysporum on castor beans using different seed health test methods. Total one thirty samples were collected from retail shops, APMC markets, fields and farmers of different agro-climatic regions of Karnataka kharif season during- 2011. The among the collected samples, five samples show a higher incidence of C. oxysporum and other fungi, were selected for PDA, Water agar and 2,4-D methods. The incidence of seed infection was 14.0 percent on a selective medium for standard blotter method (SBM), Potato dextrose agar medium 9.0 percent (PDA), Water agar medium 9.1 percent and 2,4-D 12.2 percent (2, Dichloro phenoxy acetic acid) methods respectively. Determine the rate of pathogenicity under green house conditions. C. oxysporum showed the symptoms of capsule-rot were observed in 0-0 percent capsule-rot in one month seedlings, 0-10 percent in two month seedlings and 10-50 percent capsule-rot in three month old plants, no capsule-rot observed in water treatment plants. Among the sample collected field and farmers samples show a higher incidence of C. oxysporum. The seed health test methods, SBM is most superior for isolating the C. oxysporum, pathogenic and saprophytic fungi. The importance of infected seed and its pathogenicity were discussed. C.
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