Peanut net spot, also known as brown spot disease, cloud spot disease, often occurs mixed with leaf spot disease, causing serious defoliation, and has a great impact on peanut production. Symptoms of the disease mainly affect the leaves, followed by petiole and stem. There are two types of leaf damage symptoms. One is a stain type, and the front needle-like brown dots on the front of the blade gradually expand into a nearly round, dark brown stain with clear edges and obvious chlorotic spots around. Lesions can penetrate the leaves, but the lesions on the back of the leaves are slightly smaller, and the necrotic areas of the lesions can form small black spots, which are pathogenic conidiospores. The other type is a net spot type, which forms dark brown lesions on the surface of the leaves. The lesions are slightly larger, irregular, and the edges are not clear. They are white and radial, often expanding or contiguous into dark brown lesions with no yellow halos around. This lesion does not penetrate the leaves and only damages epidermal cells. The petioles and stems were damaged, with brown spots at the beginning, and afterwards, they expanded into strips or elliptic lesions with a slight depression in the center. Severely, the stems and leaves withered and the diseased part had brown spots that were not obvious. Incidence of the disease The disease is a fungal disease, mostly in the peanut flower phase began to occur, the onset of the epidemic period to the mature period. Continuous rainy weather is conducive to the occurrence and prevalence of diseases. Sites with high humidity in the fields are prone to onset, and the incidence is heavy in continuous cropping. Control methods 1. Use varieties with better disease resistance. 2. Rotate for 1 to 2 years with non-legume crops such as corn, soybeans, sweet potatoes, and wheat. 3. Strengthen field management, increase basic fertilizer, phosphate fertilizer, and potash fertilizer, apply no nitrogen fertilizer, and properly add calcium fertilizer; reasonably water, timely cultivating loose soil, promptly drain water from the field after rain, reduce the humidity in the field; Diseased plants, diseased leaves, concentrated burning or manure, to reduce the initial infection source in the second year of disease. 4. Chemical control. At the beginning of onset, spray 70% mancozeb WP 500 to 600 times, or 75% chlorothalonil wettable powder 700 to 800 times, or 64% WP 500 times, or 70% ethoxyphos Mn-Zn wettable powder 500 times, or 80% spray WP WP 600 times, or 50% carbendazim WP 800 times, spray once every 7-10 days, even spray 2~ 3 times. China Extract Powder For Use As Dietary Supplement Extract Powder, Extract Powder Manufacturer Shaanxi Kang New Pharmaceutical co., Ltd. , https://www.anabolicsteriod.com