番茄晚疫病(PhytoPhthora infestans),菜农习惯称之为“黑秆病”,是由疫霉真菌侵染所致,主要危害番茄的叶、果实及茎部.当叶片受害时,多从时尖端或边缘开始出现不规则的暗绿色水浸状大病斑,后转为褐色;潮湿时病斑边缘与健叶交界处长出白色霉.果实上的病斑多数不规则且呈云状,边缘模糊.茎上的病斑呈暗褐色,稍凹陷,边缘白霉较明显.受害严重时,植株提前枯死,导致减产. Tomato Phytophthora infestans, vegetable farmers habitually call it “black stalk disease”, is caused by fungal infection caused by Phytophthora, the main damage to tomato leaves, fruits and stems.When the leaves victim, from the tip or The edge began to appear irregular dark green flooding-like lesions, turned brown; wet mildew edge and leaves at the junction of the growth of white mold. Most of the spots on the fruit irregular and cloudy, fuzzy edge Lesions on the stems are dark brown, slightly depressed, with more obvious white mold on the edges, and when the victim is severely damaged, the plants die early and lead to reduced production.