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In August 2012, a new tobacco root disease was observed in a number of tobacco fields in Shi-Ka Village, Pianbai Town, Youyang County of Chongqing City, China. The disease incidence varied from 10% to 40%, and the seedling mortality ranged from 50% to 80%. Affected tobacco plants developed symptoms characterized by a progressive yellowing and wilting of leaves, brown or black streaks in the stems,...
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