First, the symptoms. The root rot of pepper often occurs in the early growth period of pepper. The plants were initially wilted at noon and could be restored at night and in the morning. After a few days, the whole plant died. Note the rhizomes and roots of the diseased plants. The cortex turns pale brown to dark brown. The skin is very rough, easy to peel off, often revealing dark xylem. Its discoloration is limited to the roots and rhizomes, which is the biggest difference from the wilt of pepper. It is sometimes mistaken for a chili blight. Phytophthora blight is mostly discolored in the cortex of the base of the stem, and it only harms the cortex and phloem, and the xylem does not change color.
Second, the pathogen and the law of incidence. Fusarium wilt is caused by Fusarium oxysporum, and the pepper blight is caused by the flagellinia genus Phytophthora. The pathogenic bacteria used the chlamydospores, sclerotia or mycelia to overwinter in the soil and became the primary infestation source in the second year. Fields spread through rain or irrigation water. The application of unfertilized fertilizer or serious underground pests, heavy squeezing, heavy soil quality, and serious disease in the case of field water accumulation.
Third, prevention and control measures. 1. After harvesting and early onset, remove the diseased body in time to reduce the source of overwintering bacteria. 2. Soil disinfection. 70% soil bacteria can be used to eliminate WP, 1 ~ 2 kg per mu, or 50% carbendazim WP, 1.5 kg per mu, mix fine dry soil 30 ~ 50 kg, evenly spread on the surface before planting, Mix the seedlings after mixing. The seedbed can be sterilized with 70% soil bacteria and 1500 times liquid. 3. The base fertilizer should be fully applied organic fertilizer, and biological fertilizer added. 4. Reasonable irrigation. Hot pepper greenhouse cultivation must be high ridge film cultivation. In the deep winter season, it is not possible to flood the ditch, and it should be filled with water in the dark ditch under the sunny day. 5. The beginning of the application of pesticide control. 50% carbendazim WP 500 times, 50% polysulfide suspension 600 times, 98% hymexazide WP 2500 times, sprayed or watered. According to the condition, every 10 days, once irrigation, and irrigation 2 to 3 times.
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