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河南省小麦成株期叶枯病种类较多，且常是二种或二种以上混合发生，一般在小麦抽穗扬花期开始发病，随籽粒灌浆达到发病高峰。小麦播期、播量、品种冬春性、麦田地势及土壤、气候、套作方式、蚜害及种子带情况等，均影响叶枯病发生与流行。在气候因素中，４月上、中旬的平均气温，４月及５月上、中旬的降雨量对叶枯病发生影响最大。气温１８℃以上、多雨及田间湿度大最适合此病发生。
There are many kinds of wheat plant blight in Henan Province, and two or more kinds of wheat leaf blight are often mixed. The disease begins to occur at heading and flowering stage of wheat and reaches its peak with grain filling. Wheat sowing date, sowing date, varieties of winter and spring, wheat field topography and soil, climate, intercropping methods, aphids and seed belt situation, all affect the occurrence and epidemic of leaf blight. Among the climatic factors, the average temperature in April and mid-April and the rainfall in April and May in April and May had the greatest impact on leaf blight. Temperature above 18 ℃, rain and field humidity is most suitable for the occurrence of the disease.