International Journal of Applied Research
Vol. 2, Issue 8, Part G (2016)
Location and seed transmission of Alternaria alternata, Cercospora guizoticola in Niger [Guizotia abyssinica L, (f) Cass]
O Nagaraja and M Krishnappa
Niger is commonly called “birdseed”. It is important minor, edible, traditional oil seed crop in India. The crop is affected by number of diseases. Among them leaf blight caused by Alternaria alternata and leaf spot caused by Cercospora guizoticola these diseases are reduces the seed germination and yield up to 40-50%. Present study concentrated on location and transmission of A. alternata, and C. guizoticola in Niger seeds during kharif 2009-10 seasons in Karnataka. A total of 132 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 kharif 2009 shows A. alternata (13-28%) and C. guizoticola (16-40%) in the SBM method. A. alternata ranged from 5-13% in seed coat, 0-8% in cotyledons, while 0-1% in embryonic axis. C. guizoticola ranged from 6-11% in seed coat, 0-6% in cotyledons, while 0-1% in embryonic axis. In kharif-2010, A. alternata (18-31%) and C. guizoticola (22-42%) in the SBM method. A. alternata ranged from 8-17% in seed coat, 3-6% in cotyledons, while 0-2% in embryonic axis. C. guizoticola ranged from 8-15% in seed coat, 2-6% in cotyledons, while 0-3% in embryonic axis. The seeds tested during kharif 2009-2010 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 C. guizoticola was 28.8% in kharif 2009. In kharif 2010, the transmission was 36.6% in all the five seed samples. The present study reveals that the disease transmission is more during kharif-2010 season than 2009. The above pathogens causes leaf spot and leaf blight diseases of Niger crop.
How to cite this article:
O Nagaraja, M Krishnappa. Location and seed transmission of Alternaria alternata, Cercospora guizoticola in Niger [Guizotia abyssinica L, (f) Cass]. Int J Appl Res 2016;2(8):435-438.