豇豆红斑病(Cowpea Cercospora leaf spot)又称尾孢灰星病、灰星病、尾孢叶斑病、叶斑病,是豇豆的一种常见病害,主要为害夏播豇豆。一、发病症状1.叶片染病一般多在植株下部老叶上先发病(图1),逐渐向上蔓延。初期病斑较小(图2),呈紫色至紫红色,圆形或不规则形,发展后,受叶脉限制形成多角形或不规则形(图3)。病斑大小不等,直径3~18毫米,中央灰白 Cowpea Cercospora leaf spot (Cowpea Cercospora leaf spot), also known as Cephalotaxus cephalothorax, Ash star, Cercospora leaf spot, leaf spot, is a common disease of cowpea, the main damage to summer sesame cowpea. First, the onset symptoms 1. Leaf disease generally more in the lower part of the plant on the first onset of disease (Figure 1), gradually spread upward. The initial lesion is small (Figure 2), purple to purple, round or irregular shape, the development of restricted by the formation of polyps or irregular vein (Figure 3). Lesions ranging in size, diameter 3 ~ 18 mm, the central gray