Location and Transmission of Alternaria Alternata, Botrytis Ricini in Castor (Ricinus Communis L.)

International Journal of Agriculture & Environmental Science

© 2016 by SSRG - IJAES Journal

Volume 3 Issue 4

Year of Publication : 2016

Authors : O. Nagaraja, M. Krishnappa

10.14445/23942568/IJAES-V3I4P101

How to Cite?

O. Nagaraja, M. Krishnappa, "Location and Transmission of Alternaria Alternata, Botrytis Ricini in Castor (Ricinus Communis L.)," SSRG International Journal of Agriculture & Environmental Science, vol. 3,  no. 4, pp. 1-5, 2016. Crossref, https://doi.org/10.14445/23942568/IJAES-V3I4P101

Abstract:

 Castor is one of the important non edible oilseed crops and considered as the ancient non edible oilseed crop. The crop is affected by number of diseases. Among them leaf blight caused by Alternaria alternata and leaf spot caused by Botrytis ricini reduces the seed germination and yield up to 40-60%. Present study concentrated on location and transmission of Alternaria alternata, Botrytis ricini in castor beans during 2007-2008 kharif seasons in Karnataka. A total of 130 seed samples were collected from farmers, retail shops, fields and APMC markets and were subjected to SBM method. Five seed samples showing higher incidence of seed borne fungi in SBM were selected for location and transmission of the pathogen. The results revealed that A. alternata (10-16%) and B. ricini (9-25%) in the SBM method. A. alternata ranged from 3-8% in seed coat, 0-3% in cotyledons, while 0-1% in embryonic axis. B. ricini ranged from 2-6% in seed coat, 0-2% in cotyledons, while 0-1% in embryonic axis in kharif 2007. In kharif 2008 A. alternata (13- 25%) and B. ricini (17-33%) in the SBM method. A. alternata ranged from 5-12% in seed coat, 1-7% in cotyledons, while 0-2% in embryonic axis. B. ricini ranged from 3-7% in seed coat, 1-4% in cotyledons, while 0-2% in embryonic axis. The seeds tested during kharif 2007-08 season harvested seeds favors the more number of pathogens in the seed coat & cotyledons than in the other components. The transmission of A. alternata and B. ricini was 16.6% in kharif 2007. In kharif 2008, the transmission was 23.2% in all the five seed samples. The present study reveals that the disease transmission is more during kharif-2007 season than 2008. The above pathogens causes leaf spot, blight and gray mold diseases of castor.

Keywords:

Castor, location, Transmission, A. altrenata, B. ricini.

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