Leaf spot disease, also known as early blight or spot disease, is a serious disease on celery, which can occur from the seedling stage to the adult stage. The main damage leaves, but also damage the petiole and stem. The lesions on the leaves appeared yellow-green stains at the beginning, and then expanded to a nearly round to indeterminate tan or dark brown necrotic spot. Petioles and stems were initially immersed in water spots, then became gray-brown, oval-shaped, slightly sunken lesions, and the diseased surface was long and gray and white moldy layer when wet. In severe cases, the lesions were dense and could cause dead or lodging. The incidence of high temperature and high humidity is heavy. Control methods: 1 selection of disease-resistant varieties, such as the United States celery, Ventura, Gabriel and so on. 2 seed processing. Disease-free strains were collected and soaked in warm water at 50°C for 30 minutes before sowing, and then put in cold water and allowed to dry and sow. 3 agricultural control. Rational close planting, scientifically controlling water, increasing organic fertilizer, removing diseased bodies, and protecting the area should pay attention to ventilation and humidity. If conditions permit, rotations of more than 2 years can be implemented. 4 chemical control. In areas where this disease is predominant, 50 N.oligolides wettable powder 1000 times or 50% protection power creams 1500 times can be sprayed, spraying once every 7 to 15 days, alternating. It is better to use 5% mothionine dust 15 kg/mu for land protection.
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disinfectant is used to kill the pathogenic microorganisms on the transmission media, so as to achieve the harmless requirements, to eliminate the pathogenic microorganisms outside the human body, to cut off the transmission of infectious diseases, to achieve the purpose of controlling infectious diseases.
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