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芹菜斑枯病又称晚疫病、叶枯病,俗称“火龙”,分布很广。 一、症状表现 芹菜斑枯病有大斑型和小斑型两种,华北及东北地区发生的以小斑型为主。 在叶片上,两型病害早期症状相似。病斑初为淡褐色油渍状小斑点,逐渐扩大后,中心开始坏死。后期症状则不相同;大斑型病斑可继续扩大到3～10毫米,多散生,边缘明显,病斑外缘深红褐色,中间褐色,在中央部分散生少量黑色小点;小斑型病斑很少超过3毫米,一般大小约0.5～2毫米,常数个病斑联合(此时可超过3毫米),边缘也明显,病斑外缘黄褐色,中间黄白色至灰白色,在其边缘聚生有许多黑色
Celery blight, also known as late blight, leaf blight, commonly known as “fire dragon”, is widely distributed. First, the symptoms of cephalopathic spot blight have a large spot and two small spot type, occurred in northern and northeastern regions with a small patch type. On the leaves, two types of disease early symptoms similar. Lesions spot early light brown stains like small spots, gradually expanded, the center began to necrosis. Late symptoms are not the same; large spot type lesions can continue to expand to 3 to 10 mm, more scattered, the edge is obvious, the spot edge dark red brown, middle brown, scattered in the central part of a small amount of black dots; Type of lesion rarely more than 3 mm, the general size of about 0.5 to 2 mm, the combination of a constant lesion (in this case can be more than 3 mm), the edge is also obvious, spot yellowish brown edge, the middle yellow-white to off-white, in its Polygons have many black edges