In recent years,the bacterial stalk rot of maize severely occurred in Jilin,Henan,Shandong,Hebei province and Tianjin city.The causal pathogen is Erwinia chrysanthemi pv.zeae and sometimes Pseudomonas lapsa can cause stalk rot also.The typical symptoms of bacterial stalk rot of maize are water-soaked rot on leaf sheath and in the middle of stalk.The pathogen can over-winter in infected maize debris.The high temperature together with high humidity,continues cropping of maize and pest infestation are benefit ...