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Greenhouse pepper gets sick.
Hello Dr. Nong: I planted greenhouse shed peppers for three years. The benefits in the first two years were very good, but this year the chillies were dead. How can I prevent this disease? Hello, Wang Ying Wang Ying: Letter has been received. Now we will introduce the prevention and control of pepper disease for your reference. The epidemic of pepper has been serious in protected cultivation in recent years, especially in the areas where pepper cultivation is the main cause in successive years, which has seriously affected the production of peppers and caused huge losses to the interests of farmers. It is the current production of peppers. Urgent problems to be solved. The prevention and control measures are now described as follows: Incidence patterns: Phytophthora capsici is a fungal disease. The pathogenic bacteria mainly overwinters oospores and chlamydospores on the diseased body or soil and seeds, among which the disease-residue body in the soil has the highest rate of bacterial infection. The source of infection, the disease is a soil-borne disease, pathogenic growth and development temperature 30 °C, after the rainy days, the disease is prone to epidemic, the onset cycle is short, the soil is heavy, the field drainage is not smooth, easy to plot the incidence of land mass. Watering is too busy and the land with large water volume is also prone to diseases. In addition, the plants are densely colonized, with poor ventilation and light transmission, and the disease is heavy. Agricultural control methods: (1) After harvesting the former crops, timely clean the pasture and plough the fields; take a crop rotation and rotate the crops with legumes; select well-drained plots for cultivation. (2) Select disease-resistant varieties and use high-temperature stuffy sheds for sterilization before sowing. (3) Cultivate strong seedlings, make them densely planted, ventilate and drain moisture, pay attention to drainage, control irrigation, and reduce the humidity in the greenhouse, among which drip irrigation is preferred. Applying formula fertilization, increasing phosphorus and potassium fertilizers, using less nitrogen fertilizer, and applying top-down compound fertilizer, supplemented with biological fertilizers and humic acid, may help to activate the soil. Chemical control methods: (1) When deep-turning the soil before sowing, 50% carbendazim WP is applied per acre, 2-3kg, or 1kg of chloronitrobenzene is applied per acre. (2) Seed disinfection: Seed soaking at a temperature of 52°C for 30 minutes or 72.2% for a 12-hour period. (3) After the diseased plant is found, it should not be watered immediately. It should be sprayed and irrigated first: 600-800 times with 72.2% Precloam; or 400-500 times with 77% wettable powder; green milk 600-800 times of copper, 500 times a dry irrigation spirit to root or spray. (4) Use as much as possible 45% chlorothalonil aerosol 250-300g/mu and 5% chlorothalonil dust agent 1kg/mu/day in rainy days to reduce the humidity in the shed and reduce disease The spread of further dissemination.