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. Now its symptoms and prevention measures are summarized as follows: 1. Symptoms: Phytophthora seedlings can occur at the seedling stage and adult plant stage, and stems, leaves, and fruits can be infected. At the seedling stage, the base of the stem was dark green and rotted or rotted. Also known as seedling stage damping-off; fruit disease began at the pedicle, dark green water dip spots, quickly turned brown and soft rot, when the humidity is large, grow white mold layer, that is, pathogenic sporangia and sporangia, after drying Dark brown stiff nuts stay on the branches. Stems were affected, and the tillers became dark brown or black. The most common was the stem base. The lesions were initially immersed in water, followed by brown or black streak that spread around the epidermis. , causing the ground to collapse. The main damage is the adult plant, the plants are withered rapidly, and the Shouguang farmers call it "dead tree". It is a devastating disease and even causes an outbreak in some greenhouses. Second, the incidence of the law: pepper blight is a fungal disease, bacteria mainly oospores, chlamydospores in the sick or soil, seeds overwintering, which soil in the highest prevalence of disease, the main source of infection, the disease For soil-borne diseases, the growth and development of pathogens is suitable for temperature 30°C. After the rainy days, the disease is prone to epidemic, the onset cycle is short, the soil quality is heavy, the drainage in the fields is not smooth, and the land with easy accumulation of water is heavy. 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. III. Comprehensive prevention and control measures: The principle of prevention and comprehensive prevention. (1) Agricultural control measures 1 After harvesting the crops in the first place, clean the pastoral areas in time and plow the fields; take rotations and rotate the crops with legumes; select well-drained plots for cultivation. 2 Select disease-resistant varieties and sterilize them with high-temperature stuffy shed before sowing. 3 Cultivate strong seedlings, make them densely planted, ventilate and drain moisture, pay attention to drainage, control irrigation, reduce the humidity in the greenhouse, and drip irrigation is the preferred method. 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. Can spray more than 600 times liquid and biological fertilizer, improve plant resistance to disease. (b) Chemical Control 1 When sowing the soil before sowing, 50% carbendazim WP may be applied per acre, or 1 kg per gram of pentachloronitrobenzene may be applied. 2 Seed Disinfection: Soaking for 30 minutes at 52°C or 72.2% for 12 hours. 3 After the diseased plant is found, it should not be watered immediately, otherwise it will speed up the development of the disease. It should be sprayed and irrigated first: use 72.2% Prokary water 600-800 times; or 77% to kill WP 400- 500 times; 60% dimethyl phosphine aluminum (DTM) wettable powder 500 times; green breast copper 600-800 times, 500 times a dry irrigation Ling rooting or spray. For individual plants with severe disease, it is necessary to add strong root agent 1000 times to irrigate the roots. Sprayers can also be used to spray the ground. 4 Use as much as possible 40% chlorothalonil aerosol 250-300g/mu and 5% chlorothalonil dust 1kg/mu/day on rainy or cloudy days to reduce the humidity in the greenhouse and reduce further damage to the disease. Spread infection.
Breast Mask, Skin Care Essence,Skin Cleaning Tools,Face Mask
YERY , http://www.nbfacialmasks.com