LOCATION AND TRANSMISSION OF ALTERNARIA SOLANI, FUSARILIM OXYSPORUM IN TOMATOB. THIPPESWAMY, M. KRIS HNAPPA AND C.N. CHAKRAVARTHY
Tomato is one of the popular vegetable crop in India. The crop is affected by number of diseases. Among them early blight caused by Alternaria solani and wilt caused by Fusarium oxysporum, reduces the seed germination and yield upto 30-50%. Present study is concentrated on the location and transmission of Alternaria solani, and Fusarium oxysporum in tomato seeds during 2001-2002 kharif and rabi season in Karnataka. A total of 140 seed samples were collected from farmers, agroagencies and seeds extracted from fruits and were subjected to SBM method. Five samples showing higher incidence of seed borne fungi in SBM were selected for studying the location and transmission of the pathogen. The results revealed that, A. solani (2-15%) and F. oxysporum (7-13%) in the SBM method. Alternaria solani ranged from 0-3% in seed coat, 0-4% in cotyledons and 0-1% in embryonic axis. Fusarium oxysporum is 0-4% in seed coat, 2-5% in the cotyledons, while 0-2% in embryonic axis in kharif. In rabi, A. solani is 7-15% and F. oxysporum infected 2-13% in all the five seed samples. Alternaria solani showed 0-2% in seed coat, 0-3% in cotyledons, while 0-2% in embryonic axis. Fusarium oxysporum is 2-3% in the seed coat, 0-2% in cotyledons and 0-2% in embryonic axis. The seeds tested during kharif and rabi season harvested seeds favours the more number of pathogens in the seed coat than in the other components. The transmission of A. solani and F. oxysporum was 4.8% in kharif. In rabi, the transmission was 14.6% in all the five seed samples. The present study reveals that the disease transmission is more during rabi than kharif season.
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