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Occurrence of Puccinia polysora causing southern corn rust in the northeast Huanghuaihai region of China.

Liu, X. F. ; Xu, J. Y. ; Gu, Y. L. ; Sun, Q. Y. ; Yuan, W. Y. ; Ma, Z. H.

Plant Disease 2018 Vol 102 No. 4 pp. 826;


The Huanghuaihai (HHH) region is the major summer maize (Zea mays)-producing area in China, whereas spring maize is grown in northeast China. Although Tianjin is located in the northeast HHH region, it serves as a bridge area crossing the summer and spring maize growing regions in China. In 2016, maize leaf rust symptoms were observed on the regional trial maize varieties in Wuqing county, Tianjin. Of 106 trial varieties, 98 were infected with infection types from III to VI according to Fu et al. (2011). The pustules were randomly scattered on leaves with colour being cinnamon to yellowish brown. The pustules were found predominantly on the upper leaves but infrequently on the husks of the ear. Based on morphological characteristics, DNA sequence analysis and pathogenicity tests, the causal agent was identified as P. polysora. Previously, P. polysora was reported mainly in southern China, such as Hainan, Guangxi and so on. This is thought to be the first report of maize rust disease caused by P. polysora in the northeast HHH region of China.