根据围场1994-1998年晚疫病的流行情况和主要气象资料,分析了生长季节6-8月气象因素对马铃薯晚疫病的影响.结果表明,空气相对湿度是马铃薯晚疫病侵染的%Based on the data of main weather and late blight infection during 1994-1998 in Weichang, the authors analyzed the influence of main weather factor on potato late blight during the growing season (Jun, July and August). The result showed that relative air humidity is the key factor on late blight infection, and the late blight spots would be present within 10 days if relative air humidity was above 72% and kept for 3～4 days. The primary condition to increase and keep air humidity is rainfall and fog-dew weather. Late blight infection follows relative humidity peak value. The earlier the peak value, the earlier the infection comes. The refore, air temperature is not the main factor during this period.
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