春马铃薯是粮、蔬、饲三用重要作物。春马铃薯的病虫害主要有晚疫病、青枯病和二十八星瓢虫等。晚疫病晚疫病是一种真菌性病害。以梅雨季节为害严重。叶片受害。首先在叶尖或叶缘出现暗绿色水渍状病斑,并逐渐扩大,呈黑褐色焦斑,天气潮湿时,病斑边缘产生一圈白霉,叶背更为明显:严重时成变成焦黑,发出腐败臭味。薯块受害病斑稍下凹,灰褐 Spring potato is food, vegetables, feed three important crops. Spring potato pests and diseases are late blight, bacterial wilt and twenty-eight ladybug and so on. Late blight Late blight is a fungal disease. Severe rainy season. Blade damage. First of all, dark green water stains appeared on the tip or leaf margin, and gradually expanded to dark brown spots. When the weather was wet, a circle of white mold occurred on the edge of the lesion and the leaf back was more pronounced: Burning black, issued a corrupt odor. Potato lesions lesions slightly concave, gray brown