一、病害症状。发病初期,叶面出现淡褐色油浸状小斑点,以后扩大为近圆形病斑,按病斑分为大斑枯病、小斑枯病。大斑枯病病斑3～10毫米,散生,边缘红褐色,中间灰褐色,病斑上有少量的小黑点。小斑枯病病斑2～3毫米,边缘黄褐色,中间黄白色,病斑上散生小黑点,病斑外有黄色晕环,严重时叶变褐枯死。茎受害,病斑均为长圆型,稍凹陷,色较 First, the symptoms of disease. Early onset, the emergence of light brown oily-like small spots on the surface, later expanded to nearly circular lesions, spotted by the large spot blight, small spot blight. Spot blight spot 3 to 10 mm, scattered, red-brown edge, the middle of taupe, a small amount of spots on the black spots. Small spot 2 ~ 3 mm spots, edge of the brown, yellow and white middle, spot on the scattered black spots, yellow halo outside the lesion, when the leaves become brown dead. Stem damage, lesions are oblong, slightly depressed, more color