LOCATION AND TRANSMISSION OF ALTERNARIA RICINI, CERCOSPORA RICINI IN CASTOR (RICINUS COMMUNIS L.)

Nagaraja O, Krishnapp M

Abstract


LOCATION AND TRANSMISSION OF ALTERNARIA RICINI, CERCOSPORA RICINI IN CASTOR (RICINUS COMMUNIS  L.) 

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 ricini and leaf spot caused by Cercospora ricini , reduces the seed germination and yield up to 40-60%. Present study concentrated on location and transmission of Alternaria ricini, Cercospora 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. ricini  (16-23%) and C. ricini (9-22%) in the SBM method. A. ricini   ranged from 1-5% in seed coat, 0-3% in cotyledons, while 0-1% in embryonic axis. C. ricini ranged from 3-8% in seed coat, 0-4% in cotyledons, while 0-1% in embryonic axis in kharif 2007. In kharif-2008 A. ricini  (11-22%) and C. ricini (9-16%) in the SBM method. A. ricini   ranged from 0-6% in seed coat, 1-6% in cotyledons, while 0-2% in embryonic axis. C. ricini ranged from 2-5% in seed coat, 1-4% in cotyledons, while 0-1% 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. ricini  and C. ricini  was 35.2% in kharif 2007. In kharif 2008, the transmission was 30.2% in all the five seed samples. The present study reveals that the disease transmission is more during kharif-2007 season than 2008.



Keywords


Key words: Castor, location, Transmission, A. ricini, C. ricini

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References


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