Investigation of Corn Rust and Evaluation of Cultivar Resistance in Yunnan
HE Yue-qiu · ACTA AGRICULTURAE UNIVERSITATIS JIANGXIENSIS · 2011
To understand corn rust occurrence and cultivar resistance,the disease was surveyed in the field in 2007,2008,and 2009.The results showed that the occurrence area of this disease accounted for 15.11% ～19.29% of the whole corn planting area,showing the disease increases year by year throughout Yunnan.Corn rust occurred in late-June when corn was at the flared stage and weather was favorable for the disease development.With the rainy season coming,corn rust got progressively worse and became rapidly epidemic in early August.The incidence peak was in late August.Only 7,89 and 95 cultivars were highly resistant,resistant and moderately resistant to corn rust,respectively,accounting for 33.16% among the 576 cultivars in the disease nursery.