Bacterial leaf spot of tobacco caused by Pseudomonas aeruginosa in China.
A new disease of tobacco seedlings was observed during 2006 and 2007, in Xichou and Cangning counties, in Wenshan prefecture and Baoshan city, respectively, in Yunnan, China. Symptoms were common in the float beds and transplants, and first appeared as small, pale or dark green lesions, sometimes with curving of lower leaves, and brown lesions on the stems. Sometimes a wet rot developed, or irregularly shaped brown areas with yellow halos developed on older leaves, with some plants eventually dying. The pathogen was identified as Pseudomonas aeruginosa. Bacterial leaf spot caused by P. aeruginosa has been reported previously in the Philippines, but this is thought to be the first report of the disease from China.