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北方玉米大斑病(Helminthosporium furcium pass)大体上在高加索、外高加索、外喀尔巴阡和远东流行。1988年莫斯科植物保护研究所收集到的玉米大斑病病株中,发现玉米大斑病病菌,由这种病菌引起的大斑病严重发生(以前和现在均表现出染病的症状,而后来则不一定表现出鲜明的特征)。该年夏天天气条件与多年夏季气候指标不一样。在整个时期内有足够数量的水分,温度正常。7月份的昼夜平均气温(21.1℃)高出3.5℃,8月份降雨量(99.2毫米)超过24.2毫米。这两个月空气平均相对湿度分别为77%和84%,比多年夏季平均相对湿度高。
The Helminthosporium furcium pass is generally endemic in the Caucasus, the Transcaucasia, the Carpathians and the Far East. In 1988, the Botrytis cinerea collected from the Moscow Plant Protection Research Institute found that the disease caused by the bacterium was caused by the pathogen of the turkestan blotch disease (previously and present as symptoms of infection), and later Does not necessarily show distinctive features). The weather conditions of summer are not the same as the summer climate indicators of many years. In the entire period there is a sufficient amount of water, the temperature is normal. In July, the mean day-night temperature (21.1 ° C) was 3.5 ° C higher and in August it was more than 24.2 mm (99.2 mm). The average relative humidity of air in these two months was 77% and 84%, respectively, higher than the average summer relative humidity of many years.