1985年安大略省西南地区的马齿玉米和甜玉米发生了由细菌 Erwinia stewartii(E.F.Smith)引起的玉米细菌性枯萎病。在病叶上分离到的呈格兰氏阴性反应黄色的细菌,在渔宝接种到玉米苗上,引起了玉米细菌性枯萎病褪绿条斑的典型症状。通过对安大略省玉米发病的试验调查表明在 Essex 县和 Kent 县的玉米叶部呈中等至严重症状。在该省的较冷凉地区发病较轻。Essex 县的病害严重度比1984～1985年期间按冬季温度指数为77,比所预料的病害 In 1985, corn bacterial wilt disease caused by the bacterium Erwinia stewartii (E.F. Smith) occurred in dent corn and sweet corn in the southwestern Ontario. Gram-negative bacteria isolated from diseased leaves were inoculated on maize seedlings and caused typical symptoms of festering bacterial blooms in maize. A pilot study of the incidence of corn in Ontario showed moderate to severe symptoms of maize leaves in Essex and Kent counties. Less severe in the colder areas of the province. The severity of the disease in Essex County was 77 as compared with the winter temperature index from 1984 to 1985,