一、烟草角斑病烟草角斑病在烟草成株后期多有发生.病叶有多角形黑褐色小斑点,边缘明显,四周无明显晕圈.发病重时,病斑扩大呈多角形或不规则形,中央灰褐色,斑上有轮纹.湿度大时病斑表面“溢脓”.干燥时病斑处破碎脱落.烟草角斑病为细菌性病害.苗期很少发病,后期发病较重.多雨季节常常大发生.一般施氮肥多、钾 First, the angular tobacco leaf spot Tobacco angular leaf disease in tobacco later in life more often occur in diseased leaves polygonal dark brown small spots, the edge was obvious, no significant halo around four weeks when the disease is severe, polygonal or not Regular shape, the central gray-brown, spots on the wheel pattern.When the humidity is large, the surface of the lesion “overflow pus.” When the lesion at the dry crushing shed.Honeyic leaf spot disease is a bacterial disease.Seedling rarely seldom onset later Heavy rainy seasons often occur.General nitrogen fertilizer, potassium