Cultivation of celery in greenhouses often suffers from diseases such as spot blight, leaf spot disease, sclerotinia, and soft rot, affecting the growth of celery. Reduce production and quality. Therefore, comprehensive prevention and treatment measures should be taken for celery diseases, and the following points should be mainly addressed.
First, implement rotation. A 2-3 year rotation will reduce the accumulation of pathogens and reduce the occurrence of diseases.
Second, do a good job in seed processing. Seed soaking in warm water at 48°C for 30 minutes can effectively kill spot blotches and leaf spot pathogens attached to the seeds. When soaking, it should be agitated continuously to make it evenly heated. After soaking, it should be washed with water, dried, and then sowed. If there are sclerotia in the seeds, they can be removed with 10% saline and then rinsed with water to reduce seed carryover. It is worth noting that the soaking of warm soup has a slight impact on the germination rate of celery seeds, and the amount of seeds used for sowing should increase by 10%-20%.
Third, the implementation of film cultivation. Covered cultivation has the effect of limiting the spread of Sclerotinia. Covered with no-tillage can also reduce plant damage, thereby reducing the soft rot infection.
Fourth, strict control of temperature and humidity. High temperature and high humidity are important conditions for the occurrence of celery disease. Greenhouse celery should be controlled at 15-20°C during the winter. It is controlled at 8°C during the night. When the temperature is high, the air should be released promptly. When the temperature is low, the cover should be increased. Watering should be suitable, should be selected in the sunny morning. After watering, combined with cooling to exhale and release moisture to prevent excessive humidity. Avoid watering on cloudy or cold days. When the soil is too wet, sprinkle dry fine soil to reduce the humidity.
Fifth, rational fertilization. To apply basic fertilizer and increase phosphorus and potassium fertilizers and boron fertilizer. Develop robust plants and increase their resistance to disease.
Six, timely application of drugs. If a central diseased plant is found, it should be immediately removed, and then full application of pesticide protection, control of the disease, to prevent the spread. Usually 7-10 days, continuous medication 2-3 times. For spot blotch, 75% chlorothalonil wettable powder 600 times liquid, 64% antitoxic powder wettable powder 500 times liquid, 65% zeocin zinc wettable powder 500 times liquid, etc. can be used for spraying; leaf spot can be selected 75% thiophanate-methyl wettable powder 600 times, 50% carbendazim wettable powder 500 times, 70% thiophanate-methyl wettable powder 800 times spray, etc.; optional 50% speed for Sclerotinia Keling wettable powder 1500 times, 50% carbendazim wettable powder 500 times liquid and other spray; on soft rot, after removing the diseased plants and lime disinfected in the diseased hole, while using 72% of streptomycin sulfate for agriculture Powder 4000 times liquid or 20% copper ammonia solution 400 times full spray protection.
In winter and spring, under the conditions of rain, cold and humidity, spraying tobacco smoke in the greenhouse to prevent and treat diseases without increasing the humidity, the effect is better than the spray method, and the prevention and treatment are more thorough. For spot disease, 45% chlorothalonil smoke agent can be used, 250 grams per 667 square meters for each time; 10% fast-king spirit smoke can be selected for sclerotinia, 250 grams per 667 square meters. Method of spraying: In the evening, the smoke agent was distributed on the indoor aisle, and the dark fired ene was turned one by one out of the inside, and the smoke was immediately sealed overnight. Normally apply 1 to 7 days and cast 2-3 times in succession.
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