Hazardous symptoms The disease is at the late stage of growth, and it mainly harms the leaves of peanuts. In severe cases, the petioles, leaflets and stems can also be damaged. In the early stage of disease, yellow brown or rust color and small needle-like spots appear on the leaves. With the development of the disease, they gradually expand into round or irregular lesions with a diameter of 1-1Omm. The leaves are dark brown on the front and pale on the back, pale brown or brown. There are yellow halos around the lesion. In moist conditions, most of the lesions on the frontal surface of the leaves produce gray moldy matter, ie, conidiophores and conidia of pathogens. When the disease is heavy, a large number of lesions are formed on the leaves, and several lesions are mixed together, often causing the leaves to dry off, leaving only 3-5 young leaves at the top. The lesions on stems, petioles, and leaf tops are oblong and dark brown, and the lesions are slightly sunken in the middle. Incidence factors 1. Soil viscosity, partial acidity; multi-year weight loss, field residue and more; too much nitrogen fertilizer application, growth too tender; lack of fertility, extensive farming, weed grass, plant resistance decreased, heavy disease. 2. Fertilizers are not fully cooked, organic fertilizers or fertilizers are mixed with susceptible diseases of Gramineae crops. 3. The planting density is high, ventilation and light transmission are not good, and the incidence is heavy. Underground pests and nematodes are more susceptible to disease. Underground pests are harmful and pathogens invade the wounds and are prone to disease. 4. Low-lying terrain with stagnant water, poor drainage, soil moisture, and more disease in the field; high temperature, high humidity, more rain, and less sunshine are more prone to morbidity; after heavy rain, it is fine and hot, and the condition develops rapidly. Control methods 1. Seed sterilization seed dressing with 0.5% seed weight of 50% carbendazim WP. 2.Initial spraying of spray application: 20% triadimefon EC 2000 times, 20% triadimefon WP 1000-1500 times, 70% thiophanate-methyl (methyl thiophanate) wettable powder 1000 Times of liquid, 50% Benzene (Benzoxacillin) wettable powder 1500 times, 50% carbendazim wettable powder 900-1000 times, 70% chlorothalonil wettable powder 600-800 times, 40% Chlorothalon Sulfate Suspension (Shuntianxing No. 1) 600 times, 80% Spray Can WP 600 times, 70% Mancozeb WP 400-500 Times, 50% Colloid Sulfur 200 times or 1 : 2:200 times Bordeaux mixture. When spraying, add 0.2% detergent as a spreading agent, once every 15-20 days, even 2-3 times. Window-Frame Transparent Dressing Window-Frame Transparent Dressing,Oem Shear Transparent Dressing,Custom Transparent Dressing,Waterproof Transparent Dressing Zhende Medical Co.,Ltd , https://www.zdmedicalproduct.com