The black poles of chili peppers are hairy and are mainly caused by epidemics. Widespread throughout the country, the harm is getting worse. The general incidence of 20-30%, more than 50% of serious, or even cause devastating damage. First, the symptoms of disease at the time of seedling disease, early dehydration wilting, easy defoliation, the stem base was dark green water soft rot, easy lodging. Adult stage disease, not obvious in the early stage, when the formation of long-form 3-5 cm or longer into a dark brown long spot, the lesion quickly spread around the stem, the disease gradually junction, the lesion slightly depression or contraction . A large round of water-soaked lesions are formed near the tip of the leaf or on the leaf margin. The entire leaf is softly rotted and withered. The fruit starts from the peduncle, the water is immersed in dark green, the brownish soft rot quickly, and the late water dehydration occurs. Shrink but not fall off, visible sparse gray moldy when wet. Second, the occurrence of regular germs with the disease in the soil in the winter, the field spread by irrigation water carried into the deep soil, leaf and fruit by wind and rain, agricultural operations contact infection. Onset temperature 25-30 °C, humidity 85%. Fields usually begin around mid-May, with an apparent episode of disease or central disease, with the peak of the epidemic from June to early July. High-temperature and high-humidity, the weather turned fine after heavy rains, heavily populated, flooded and flooded fields, cultivation of flat rice, long peppers, etc. The disease was severe and rapid. Ineffective prevention and control, 3-5 days will make chili death. Third, prevention and control methods 1, the implementation of rotation, the general implementation of 2-3 years rotation. 2. Select resistant varieties, such as Yahua 205, Yahua 105, etc. Seeds soaked with warm soup, 1% copper sulfate soaked in disinfection, or 72.2% Preclosure 600 times liquid, or 20% methyl-prepared phosphorus 1000 times soaking seeds for 12 hours, washed, sowing or germination. 3, soil-free seedlings, soil disinfection can be used 25% Rhizoctonia or 75% chlorothalonil 8 grams per square meter plus 10-15 kg of fine soil and mix well, 1/3 pad seedbed, 2/3 for cover soil. Cultivate age-appropriate seedlings and moderate seedlings. 4. Apply enough base fertilizer to produce more than 3,000 kilograms of quality manure per acre and 40-50 kilograms of superphosphate. The use of deep sorghum, mulching film cultivation, pay attention to shallow water irrigation, irrigation during the high temperature period should be in the morning and evening irrigation well water, timely drainage after the rain, moderate water control after ridge sealing, timely removal of diseased plants, diseased leaves, fruit disease. 5, pharmaceutical control. At the time of colonization or after the seedlings were rejuvenated, the planting holes were filled with 72.2% Prec or 64% of the WP wettable powder 500 times, and each pot was poured with 250 ml. Spray 1:1:200 Bordeaux fluid or 58% metalaxyl MnZn wettable powder 400-500 times before the onset. After the central diseased plant was found in the field, the diseased plants and diseased branches were promptly removed, and 50% amethyst copper wettable powder 500-600 times liquid was sprayed, 60% DTM wettable powder 500 times liquid, and 77% wettable powder 500 was obtained. Times of liquid, 75% chlorothalonil WP 800 times, etc., 7-10 days, 2-3 times in a row, severe every 5 days, 3-4 times in a row. Protected cultivation, in addition to enhanced ventilation, can also be used 45% chlorothalonil aerosol, 250 grams per acre, or 5% chlorothalonil powder, 1 kg per acre, once every 7-10 days, continuous 2 -3 times. (Wang Dixuan, Hushan District Vegetable Bureau, Yiyang City, Hunan Province)
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