The celery spot blotch, also known as late blight and leaf spot disease, commonly known as “fire dragonâ€, is a common disease in the production of protected celery and affects the yield and quality of celery. In the deep winter season, the adverse conditions of low temperature and high humidity are often conducive to the occurrence and spread of the disease. The symptoms and prevention methods of the disease are as follows.
First, the symptoms. The main damage leaves, followed by the petiole and stem. The old leaves first develop from outside to inside. At the beginning of the lesion, the spots were light brown oil-immersed and the edges were obvious. Afterwards, they developed irregular lesions. The color changed from pale yellow to grayish white, and the edges were dark reddish-brown, and many small black particles were gathered. There was often a circle outside the lesions. Yellow halo. Petiole, stem lesions brown, slightly concave depression, scattered black dots in the middle, when dry leaves dry rotten.
Second, the incidence of law. The celery spot blight is a kind of fungal disease. Low temperature and high humidity are beneficial to the disease. The most suitable temperature is 20～25°C and the humidity is above 95%. During the deep winter season and even cloudy days, the temperature fluctuates frequently. Or hot during the day, night condensation, plant growth is weak, more irrigation, ventilation and dehydration can often lead to the rapid expansion and spread of disease. ?
Third, prevention and treatment methods.
1, balanced fertilization. To apply foot-planted fertilizers and organic fertilizers that are decomposed, the application of phosphorus and potassium fertilizers in top-dressing should be controlled, and the amount of nitrogen fertilizers should be controlled. Some foliar fertilizers and trace fertilizers can be sprayed to increase plant resistance.
2, cooling and humidity. During the day, the temperature is controlled between 15 and 20°C. When the temperature exceeds 20°C, the air should be released in time, and the temperature should be controlled at 10-15°C at night to reduce the temperature difference between day and night and reduce condensation. Do not flood the area with water.
3, chemical control. With 45% of the chlorothalonil smoked tobacco shed, 150 grams per acre dispersed 5 to 6 lit, fumigation 1 night, once every 10 days. 70% of mancozeb WP can be sprayed 600 times at the beginning of onset, or 50% of Carbendazim WP can be 600-800 times, once every 7-10 days, continuous spraying 2 or 3 times with obvious Prevention and treatment effects.
4, remove diseased plants. For diseased sheds, diseased plant residues should be cleared in time to reduce the proliferation and spread of bacterium sources.
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