玉米弯孢霉叶斑病,又称玉米弯孢菌叶斑病、螺霉病或黑霉病,主要分布在热带玉米产区。主要发生在玉米生长中后期,一般减产20%~30%,发病严重的减产50%以上,甚至绝收,是目前玉米生产上必须高度重视的一种新病害。1.识别要点主要危害叶片,发病初期病斑小(直径1~2毫米),为淡黄色透明点,扩大后为圆形、椭圆形、梭形或长条形病斑,病斑(2~5)毫米×(1~2)毫米,严重时可达7毫米×3毫米,病斑中央乳白色,边缘呈黄褐色或红褐色,外围有明显 Corn curdles leaf spot disease, also known as Curvularia leaf spot, spirochetes or black mold disease, mainly in the tropical corn producing areas. Mainly occurred in the late maize growth, the general reduction of 20% to 30%, the incidence of serious reduction of more than 50%, or even Abandonment, is currently the corn production must attach great importance to a new disease. 1. Main points of identification The main hazards of leaves, the lesion at the early lesion small (1 to 2 mm in diameter), for the light yellow transparent point, expanded to round, oval, fusiform or long strip lesions, lesions (2 ~ 5) mm × (1 ~ 2) mm, severe up to 7 mm × 3 mm, milky white central spot, edges were brown or reddish brown, the periphery was obvious