Leaf blight of Castor caused by Alternaria ricini: Detection and Pathogenicity in Castor (Ricinus Communis L) Seed

International Journal of Agriculture & Environmental Science
© 2016 by SSRG - IJAES Journal
Volume 3 Issue 4
Year of Publication : 2016
Authors : O. Nagaraja, M. Krishnappa
How to Cite?

O. Nagaraja, M. Krishnappa, "Leaf blight of Castor caused by Alternaria ricini: Detection and Pathogenicity in Castor (Ricinus Communis L) Seed," SSRG International Journal of Agriculture & Environmental Science, vol. 3,  no. 4, pp. 6-10, 2016. Crossref, https://doi.org/10.14445/23942568/IJAES-V3I4P102


The present investigation was undertaken with the main objective to determine detection on seed borne Alternaria ricini and its Pathogenicity were conducted at Department of Applied Botany, Plant Pathology laboratory, Kuvempu University, Jnanasahyadri, Shankaraghatta, Shivamogga, Karnataka. Castor is one of the important non edible oilseed crops in India. The objective of this work were to estimate the incidence of A. ricini on castor seed using different seed health test methods. A total sixty nine samples were collected from retail shops, APMC markets, fields and farmers of different agroclimatic regions of Karnataka kharif during- 2011. The among the collected samples, five samples show a higher incidence of A. ricini and other fungi, were selected for PDA, Water agar and 2,4-D methods. The incidence of seed infection was 16.8 percent on a selective medium for standard blotter method (SBM), Potato dextrose agar medium 10.8 percent (PDA), Water agar medium 15.8 percent and 2,4-D 7.0 percent (2, Dichloro phenoxy acetic acid) methods respectively. Determine the rate of pathogenicity under green house conditions. A. ricini showed the symptoms of leaf blights were observed in 1-10 percent wilts in one, 10-30 percent in two month seedlings and 30-70 percent leaf blights in three month old plants, no leaf blights observed in water treatment plants. Among the sample collected field and farmers samples show a higher incidence of A. ricini. The seed health test methods, SBM is most superior for isolating the A. ricini, pathogenic and saprophytic fungi. The importance of infected seed and its pathogenicity were discussed. A. ricini is a causal agent of leaf blight disease of castor crop


Castor, Seed health tests, Pathogenicity, A. ricini, SBM.


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