The celery leaf blight, also known as celery leaf blight, is an important disease of celery in the winter and spring seasons. It is widespread and serious, and has a great impact on the yield and quality, and can continue to harm during the storage and transportation period. Yang Zhongan, a professor at the Agricultural Science Academy of Northwest Agriculture and Forestry University, reminded farmers to master the rules of disease and to prevent and treat it as soon as possible.
The law of incidence
The leaf blight of celery mainly damages the leaves, followed by the petiole and stem. The old leaves first attack, from the outside to the inside, when it is severe, it can cause the leaves to dry. The celery spot blight is a kind of fungal disease. Low temperature and high humidity are beneficial to the disease. The most suitable temperature for the disease is 20-25°C and the humidity is above 95%. Even the cloudy days, frequent temperature fluctuations, or hot daytime, dew condensation at night, weak plant vigor, more irrigation, and lack of timely ventilation and dehumidification can often lead to the rapid spread of the disease.
Control methods
The lethal temperature of the seed-sterilized celery leaf spot blight is 48-49°C. Therefore, it can be soaked with this temperature for 30 minutes before sowing in the field, and it is continuously stirred during soaking.
Scientific fertilization base fertilizer should be applied with fully decomposed organic fertilizer. Apply phosphorus and potash fertilizer in top-dressing, control the amount of nitrogen fertilizer, spray some foliar fertilizer and micro-fertilizer as far as possible to enhance plant resistance.
Timely dehumidification During the daytime, the temperature is controlled at 15-20°C. When the temperature exceeds 20°C, the air should be released in time. The temperature should be controlled at 10-15°C at night to reduce the temperature difference between day and night, reduce condensation, and avoid flooding.
The prevention and treatment of the disease should be started when the height of the celery seedlings is 3 cm, sprayed once every 7-10 days, and sprayed 2-3 times. The period of greenhouse infection can be 45% chlorothalonil aerosol or 5% chlorothalonil powder. Spraying agent can also be used 70% mancozeb WP, 58% MnZn WP, 64% WP wettable powder and so on. For the sheds that have already been attacked, the diseased plant residues in the shed must be promptly removed to reduce the spread and spread of the bacterium source.
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