The pickled pepper disease is a soil-borne disease caused by Phytophthora capsici. Once this disease occurs, the lighter person severely cuts production, but the harvest is severe. Due to the short onset cycle of the disease and its rapid spread, it has brought great difficulties to prevention and control. In recent years, the Agricultural Bureau of Zouping County of Shandong Province has systematically studied the prevention and control of cabbage pepper diseases in greenhouses. Based on the full understanding of its occurrence rules, combined with the cultivation and management conditions of greenhouses, and in view of its occurrence characteristics, it has established an agricultural ecology. The prevention and treatment technology system is mainly based on prevention and control, disease-resistant varieties and chemical fungicides. First, the incidence of symptoms of rapeseed can be the disease at seedling stage, the stem base was dark green water-like soft rot or tripping, that is, damping-off disease at seedling stage. In the adult plant stage, the stem base is mainly damaged, and it is initially immersed in water. After the epidermis becomes dark brown, the diseased area is obviously shrunk, causing the entire plant to wither and die and become a devastating disease. In the later period, it also harmed the fruit, making the fruit dark green water immersed, soft rot. Second, the onset of illness is mainly caused by infectious diseases in the soil, spread with watering. High temperature and high humidity are favorable for disease incidence. Generally, the soil moisture after watering is large, the incidence is rapid, and the planting is too dense. III. Control methods 1. Agricultural ecological control (1) Clean greenhouses promptly after harvest to reduce the spread and accumulation of germs: During the growth period and after harvest of rapeseed, timely removal of field diseased plants and diseased bodies is prohibited, and it is forbidden to treat diseased plants and diseased bodies. Randomly stacked, it should be burned. (2) Deep-turning soil: Because the disease is a soil-borne disease, the complete elimination of pathogens in the soil is the primary factor in reducing the incidence. Before the transplanting, the soil was sunk deeply to increase the air permeability of the soil, promote the quick seedlings after planting, strengthen the root system, enhance the disease resistance of the plants, and promote high-ridge cultivation. (3) Reasonable fertilization and improvement of disease resistance of plants: mainly organic fertilizer with full maturity, phosphorus and potassium fertilizers as basic fertilizer, less nitrogen fertilizer at seedling stage, and top-dressing during flower bud stage to promote vigorous growth of rapeseed, prevent premature aging, and reduce disease occurrence , has an extremely obvious effect. (4) Scientific irrigation and water control: The incidence and prevalence of rapeseed disease are positively correlated with the temperature and humidity in the shed. Generally, the higher the temperature, the greater the humidity, and the more serious the epidemic occurs. The disease center is often formed at the front edge of the shed and the shed and drips in the shed. Therefore, watering should be timely and appropriate. After planting, water should be poured to planting water. When the roots are slowly growing, the water should be properly controlled, and the roots should be deepened and the soil layer must be fully supplied. Avoid flooding irrigation, water accumulation after irrigation, and ventilation. (5) Strengthen cultivation management and cultivate disease-free strong seedlings. 2. Chemical prevention Because of the short onset cycle of epidemics, the epidemic spreads rapidly and once the epidemic is extremely difficult to control. Therefore, for the prevention and control of rapeseed disease, we must strive to prevent the disease in the early stages. Generally, it is better to use drugs at the early flowering stage. At this time, the cauliflower has just changed from vegetative growth to reproductive growth. The nutrient consumption is relatively large, the plant disease resistance is weak, the bacteria is easy to invade, and the pathogen can kill the soil bacteria and prevent the foreign bacteria. Invasion of the source. (1) Seed treatment: Before seedling raising, the seeds are soaked in warm water of 55°C for 30 minutes, or soaked in 10% formalin for 30 minutes, and the liquid medicine is preferably immersed in seeds of 5 to 10 cm. Can also be used 20% methyl formitor emulsifiable concentrate 1000 times soaking 12h, remove and wash, germination seeding; or with 64% antivirus WP 500 times soaking seed disinfection. (2) Seedbed treatment: When using the old nursery bed nursery, the nursery bed should be disinfected. Available 58% metalaxyl MnZn wettable powder or 69% Anke manganese zinc wettable powder 8 ~ 10g/m2 and fine soil 4 ~ 5kg evenly mixed, under the premise of pouring seedbed water, take 1/1 3 spread poisonous soil on the bed, sow 2/3 poisonous soil after sowing. Or with aluminum phosphorus manganese phosphorus 10g / square meters, plus 10 times the fine dry soil and mix well, evenly spread in the seedling bed surface, plan to dig into the soil, flat sowing. (3) Soil treatment: B. Phosphorus, aluminum, manganese and zinc 10g/m2, 10 times fine dry soil and mix thoroughly, spread on the whole shed floor, and plow till the soil. When planting, use B-aluminum manganese zinc 1 ~ 2kg / square meter, add 20 ~ 30kg / square meter of fine dry soil and mix well, sprinkle in the ditch or inside the hole. (4) Irrigation or rhizome spraying: 58% metalaxyl MnZn wettable powder 800 times, 69% Zn WP 800 times, 72% DuPont Glucosamine 500 times, 64% Anti-drug powder can be 500 times liquid, 72.2% Prokary water 700 times continuous irrigation or spray 2 or 3 times, 200 ~ 250mL hole filling, interval 7 ~ 10d; disease pandemic, with a Interval time can be shortened to 5 ~ 7d, the number of medication increased to 4 ~ 5 times. 96% copper sulfate crystals can also be used 37.5 ~ 45.0kg / ha with water irrigation or potassium permanganate 7.5kg / ha with water irrigation. The method is to use copper sulfate or potassium permanganate wrapped in fine gauze, tied to the wooden strips, and inserted into the outlet to flush with water. However, due to the short duration of the above two agents, they must be used at each irrigation, otherwise, it is difficult to achieve the desired control effect.
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