STUDIES ON THE SYMPTOMS OF THE NECROTIC WILT OF SUNFLOWER CAUSED BY TOBACCO STREAK VIRUS
Publication Date : 30/11/2015
The sunflower necrosis disease of sunflower is one of the important diseases causing heavy losses in edible oil seed in the country. It is an emerging threat for sunflower production system in southern India, reported for the first time at Bagepally region of Kolar district and around Bangalore in Karnataka during 1997. Later, its occurrence was reported from almost all sunflower growing states of India, posing threat to sunflower cultivation. A new virus, imparting necrosis leading to mortality of the plants have been reported. Considering the importance of yellowing and necrosis disease in sunflower, the present study has much relevance and hence will be a stepping stone to etiological aspects of virology. The virus isolates causing necrosis and yellowing respectively have been identified as two different strains of Tobacco Streak Virus (TSV) viz. Isolate-N (I-N) and Isolate-Y (I-Y). The two isolates caused different symptoms at different growth stages of sunflower plants in Kharif and Rabi seasons.