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分析结果表明,呼市地区露地黄瓜霜霉病一般在6月下旬开始发病,7月上中旬病害开始流行。黄瓜霜霉病的发生与流行与6月下旬至7月下旬的旬平均湿度和累积降雨量以及连续5d 以上的阴雨天关系密切。旬平均相对湿度高于72％,累积降雨量高于152.8mm 以上,为重发生年;二者条件具一,为中发生年;连续5d 以上的阴雨天,会促使病害加重发生。旬平均湿度低于60％,降雨量低于90mm 以下,病害为轻发生年或轻微发生年。呼市地区6月下旬～7月下旬的旬平均温度为20.9℃～22.5℃,均是适于病害流行的最佳温度。
The results showed that the outcrop cucumber downy mildew in Hohhot generally started to emerge in late June, and the disease started to pop up in mid-July. The occurrence and prevalence of cucumber downy mildew were closely related to the average humidity and accumulated rainfall in late June to late July, and the overcast rainy days of more than 5 days. Ten days average relative humidity is higher than 72%, the cumulative rainfall above 152.8mm, re-birth year; the two conditions have one, as in the year; more than 5d rainy days, will promote the occurrence of disease. The average humidity less than 60%, less than 90mm below the rainfall, the disease is mild or slightly occurring year. Hohhot area from late June to late July ten days average temperature of 20.9 ℃ ~ 22.5 ℃, are suitable for the epidemic of the best temperature.