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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关键因素。如果空气相对湿度在 72 %以上且保持 3～ 4d ,晚疫病病斑将在 10d内出现。相对湿度高峰值之后是晚疫病的侵染期 ,相对湿度高峰值出现越早 ,晚疫病的侵染也早 ,保持和增加空气湿度的主要条件是降雨和雾、露天气。因此 ,气温不是这期间影响晚疫病流行的主要因素。
According to the epidemic situation and main meteorological data of late blight from 1994 to 1998 in paddock, the influence of meteorological factors from June to August in growing season on late blight of potato was analyzed. The results showed that air relative humidity was the key factor of potato late blight infection. If the air relative humidity is above 72% for 3 to 4 days, the late blight spots will appear within 10 days. The peak value of relative humidity was followed by the late blight period. The earlier the relative humidity peak appeared, the earlier was the infection of the late blight. The main conditions for maintaining and increasing the air humidity were rainfall, fog and open air. Therefore, temperature is not the main factor influencing the outbreak of late blight during this period.