西芹斑枯病又叫晚疫病、叶枯病，俗称火龙。我县保护地、露地西芹发生较为普遍，有些田块发生较重。据近年我县冬季棚室调查，病田率达46.3％，一般田病株率21.5％，严重的病株率达70％以上，对产量及品质影响很大，已成为我县保护地芹菜生产上亟待解决的新问题。1 症状识别主? Western Blot also called late blight, leaf blight, commonly known as fire dragon. My county protected areas, celery exposed celery more common, some fields occurred heavier. According to a survey of winter sheds in our county in recent years, the disease rate reached 46.3%, the rate of common field strains was 21.5% and the rate of serious diseased plants was over 70%, which had a great impact on yield and quality and had become the production of celery in our county On the new problems to be solved. 1 symptoms identify the main?