Rainy days, warm and foggy, large temperature difference between day and night, prone to potato late blight, growers to prevent and treat as soon as possible. First, the symptoms of disease Late blight mainly harms potato leaves, stems and tubers. After the onset of disease, the area and number of lesions in the leaves increased rapidly. As a result, the potato plants in the entire field were killed early and caused tuber rot, which seriously affected the yield. At the early stage of leaf disease, dark green spotted spots appeared on the leaf tip or leaf margin. When the weather was wet, the lesions expanded rapidly, and a circle of sparsely white moldy wheels emerged at the edge, especially on the back of leaves. In severe cases, lesions spread to the main veins and petioles, resulting in wilting of the leaves. When the climate is dry, the lesions are dry and brown. The stalks were damaged and the dents were slightly concave at the beginning. When the climate was wet, the surface also produced white mold. The tuber suffers from light brown or grayish purple irregular lesions, sinks slightly, and the lower layer of potato becomes brown. When the soil is dry, the diseased tubers become hard and atrophy, and when it is wet, it can grow white mold. Second, control methods Timely cultivating, earth-cultivation, ditching drainage, increasing potash fertilizer, and improving disease resistance; In the early stages of the occurrence of late blight, remove the diseased plants in time, spray 58% metalaxyl manganese zinc, 64% antivirus, and M-45 , 72% DuPont Kelu, 69% Anke manganese zinc and other control, and spray foliar fertilizer. In order to reduce the occurrence of potato pesticide resistance, it is best to use a variety of agents alternately, spray once every 7 to 10 days, usually spray 2 to 3 times. As a professional supplier of medical apparatuses and instruments, Suzhou Medtion International Trade Co., Ltd. is located in Zhangjiagang City, Jiangsu Province. We are wholly owned subsidiary of Jiangsu Redleaf Medcial Equipment Co., Ltd who is a professional Medical equipment producer for 30 years. Orthopedics Medical Device,Calcaneus Locking Plates,Titanium Calcaneus Plate,Titanium Orthopedic Instruments Medton Medical , https://www.medtonmedical.com