斑枯病是西芹的主要病害,严重制约着西芹种植的进一步发展,通过我们两年的观察,研究以及药效试验,现总结如下。一、症状最初在下部叶片上长出浅黄色水渍状小斑点,圆形或近圆形,多群集性,常相互融合成不规则病斑,病斑后期变成灰白色,散生许多小黑点。叶柄病斑长圆形,颜色较深。严重时,整个叶片干枯,叶柄腐烂。大田中,轻发生时,影响 Spot blight is the main disease of celery, severely restricted the further development of celery planting, through our two years of observation, research and efficacy test, are summarized as follows. First, the symptoms initially in the lower part of the leaves grow pale yellow water-like small spots, round or nearly circular, clustering, often merged into an irregular lesion, lesion later into a gray, scattered many black point. Petiole disease oblong, darker color. Serious, the entire leaves withered, petiole rot. In the field, light occurs when it affects