１主要病害①叶斑病。又称蛇眼病，主要危害叶片，发病初期，叶面出现小而无一定形状的红色或紫红色病斑，之后病斑扩大，病斑中心呈灰色或灰褐色圆斑，四周紫褐色，状如蛇眼。该病温暖高湿时易发生，老叶先发病，逐渐延至全株，开花结果前发病轻，开始采收后大量发生，... 1  major diseases ① leaf spot disease. Also known as the snake eye disease, the main hazard leaves, the early onset, the emergence of small but not certain shape of the red or purple lesions, after the expansion of lesions, lesion center was gray or brownish brown spots, surrounded by purple-brown, like Snake eyes. The disease is prone to occur when warm and humid, the old leaves first onset, gradually extended to the whole plant, the onset of flowering before the onset of light, began to occur after a large number of harvest, ...