Green pepper is one of the main varieties of vegetable cultivation in winter. In recent years, the cultivated area has been expanding. However, the diseases in some areas have increased year by year, affecting the quality and yield of green peppers. Therefore, it is necessary to prevent and control the damping-off of green pepper, blight, virus disease, and wilt disease. Symptoms of green pepper damping-off and blight occur in the seedling stage. At the beginning of the cataplexy, a water-stained lesion appeared on the base of the stem, which turned yellow-brown. The cotyledon did not wither and the seedlings fell to the ground first. Bacterial disease first produces an oval-shaped dark brown water-stained lesion on the stem, and the depression expands around the stem. Finally, the whole plant shrinks and dies. Viral diseases mostly occurred in the late growth stage. The mosaic leaves were dark green and white. In severe cases, the leaves were uneven, but the leaves were not fallen, the veins were shrinking and deformed, the diseased plants were dwarf, and the fruits were small and small; the yellowing diseased leaves. Color yellowing and litter, abnormal formation of strips, plant dwarf, branching more, was plexiform; necrotic diseased diseased branches become brown and necrotic. Fusarium wilt occurs in both seedlings and adult plants, resulting in yellowing and withering of the leaf from one side of the stem to the bottom. Afterwards, it gradually expands upward and becomes semi-blight. When the disease is heavy, the whole plant withered and the vascular bundle of the diseased plant stem was brown. . Control methods 1. Cultivate strong seedlings. Choose wasteland or paddy fields as nursery sites, and use 0.5 kg of enemy pine per mu for soil disinfection. Soaking with warm water at 55°C for 10 minutes before sowing, and then dressing with 50% carbendazim WP 0.3% to 0.5% can prevent fusarium wilt. 2. Cultivation management. Rational rotation, full base fertilizer, apply more organic fertilizer, nitrogen, phosphorus, potassium fertilizer application ratio of 1:0.4:1.2. Starting from the ditch, reasonable close planting, spraying a single time of potassium dihydrogen phosphate during the flowering period and the result period, spraying 100 kg of potassium dihydrogen phosphate per acre for 60 kilograms of water, can improve the disease resistance of plants. 3. Spray control. Once the above diseases occur, the diseased plants should be removed and burned in time, and lime powder must be disinfected at the diseased points, or sprayed with 75% chlorothalonil 1000 times solution to suppress the spread of the disease. Appropriate chemicals should be used to prevent and control: 1 damping-off and blight in the early stages of the disease with 75% chlorothalonil 600 times or 95% of the enemy to spray 1000 times enemies. 2Virus disease is transmitted by susceptible locusts, so the locusts can be killed by 2.5% enemy kill or Uranus 3000 times solution or vegetable and fruit phosphorus 1500 times, spraying disease with 1000 times solution of plant disease or 2% virus a500 times. Area. 3 Wilt pathogens can overwinter in soil or on seeds. Therefore, we must use resistant varieties, can also use 50% carbendazim or 50% thiophanate-methyl 500 times soaking root. The above liquid is sprayed once every 7 to 10 days and sprayed twice.
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