Cucumber downy mildew,caused by Pseudoperonospora cubensis Rostow,is a major disease of cucumber. The disease is severe in more 70 countries,causing considerable reduction in yield and quality. After 80s of 20th century,with the development of green house scale,the condition of temperature and humidity benefits to disease epidemic in green house,cucumber downy mildew is expanding which becomes the disturbance of cucumber production. In order to effectively control cucumber downy mildew and reduc...
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