1. Bacterial blight prevention and control of celery cultivation in protected areas, easy to cause damage by the fungus spot blight, the incidence of the appropriate temperature of 200c - 250C, humidity of 95% or more. In general, low temperature and low illumination, frequent temperature fluctuations, or daytime hot weather, nighttime dew condensation, and weak plant growth can prompt the rapid spread of disease. Prevention methods are as follows: 1 use disease-free seeds. Seed breeding should be based on the selection of non-disease-producing mother plants on the ground, and should not be used in conjunction with or adjacent to celery, and field management should be carried out so that weeds, no dirt, and disease-free seeds can be harvested. According to the characteristics that germs can only survive for about 1 year in the species, Chen seeds can be sown for more than 2 years. 2 do a good job of seed treatment. Seed soaking in warm water of 4812 for 30 minutes. During the soaking process, stirring is continued to make the temperature distribution uniform, and then air-dried for sowing. 3 strengthen the cultivation and management. The application of farmyard manure should be treated with high temperature to fully decompose and increase phosphorus and potassium fertilizers to increase plant resistance. Irrigation water should be poured into small water, avoid flood irrigation, while doing a good job of ventilation and humidity and night insulation management. Pay attention to the timely removal of diseased plant debris, reduce bacteria source. 4 timely spraying protection. When the celery seedlings are about 3 cm tall, spraying protection begins. Spray once every 7-10 days, spray 2 - 3 times. In addition, when the disease occurs, it must be banned from spraying at the initial stage. Common agents are: 70% Mancozeb WP or 58% Repes MnZn WP 500 times; 75% chlorothalonil WP 600 times; 70% thiophanate WP or 50 % carbendazim WP 800 times. 2. Greenhouse Disease Integrated Prevention and Control Greenhouse cultivation of celery is often harmed by diseases such as leaf spot, sclerotinia, and soft rot, affecting the growth of celery and reducing yield and quality. Comprehensive prevention and treatment measures should be taken for the diseases of celery, and the following points should be carefully grasped: 1 Implement crop rotation. A 2-3 year rotation will reduce the accumulation of pathogens and reduce the occurrence of diseases. . 2 do a good job of seed treatment. It can effectively kill spot blotches and leaf spot pathogens attached to seeds. If there are sclerotia in the seeds, they can be removed with 10% saline, and then washed with water to reduce the seed bacteria. It is worth noting that warm soaking has a slight effect on the germination rate of celery seeds and should be increased by 10% to 20% when sowing. 3 the implementation of film cultivation. Covered cultivation has the effect of limiting the spread of sclerotinia, and no-tillage is also used to reduce plant damage, thus reducing soft-rot rot. 4 strictly control the temperature and humidity. High temperature and high humidity are the main conditions for the occurrence of celery disease. The daytime temperature of greenhouse celery should be controlled at 15°C to 20°C and 8°C at night. If the temperature is high, the air should be released promptly. When the temperature is low, the cover should be increased. Watering should be suitable, usually choose sunny morning. After the watering, combined with cooling to exhale air to prevent excessive humidity. Avoid watering on cloudy or cold days. The soil is too wet to sprinkle some dry fine soil to reduce the humidity. 5 Rational fertilization. To apply basic fertilizer and increase phosphorus and potash fertilizers and boron fertilizer, develop robust plants to improve their resistance to disease. 6 The agent is administered in a timely manner. When a central diseased plant was found, the disease was immediately removed and the disease was fully controlled to prevent spread. Sclerotinia can be used 50% fasting WP 1500 times, 50% carbendazim WP 500 times spray. For soft rot, after disinfecting the diseased plants, lime was disinfected at the disease point, and 72% of the agricultural streptomycin sulfate powder was sprayed at 4000 times. In the cold and wet conditions, smoke agents are applied to prevent diseases. For spot blotch, 45% chlorothalonil smoke can be used with 250 grams per mu. Sclerotinia can be used 10% fast Ke Ling smoke agent, 250 grams per mu. Application method: In the evening, the smoke distribution points were placed on the indoor aisle and ignited one by one from the inside with dark flames, and the smoke was sealed overnight. Usually 7-10 days cast once, continuous cast 2-3 times.
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