Celery early blight is also known as celery spot disease, which damages the leaves of the crop and causes water-stained spots on the leaves. The top of the celery can be infected. The leaves were infected and the water spots began to fade into green, round, and small spots. They gradually developed and enlarged nearly round or irregular shaped large lesions. The edges of the diseased areas were not obvious and the center was gray-brown. After the lesions are linked to each other, the dead leaves die. When the humidity is high, the disease minister has a gray moldy layer. The petiole became oblong or streaked, water stained, gray-brown, depression, petiole often fractured from the diseased part, and the diseased part had gray mold.
The law of incidence
The pathogens may overwinter on the celery in the protected area with the mycelium attached to the seed or the sick. When conditions are appropriate, conidia are produced and transmitted through rainwater, air currents, agricultural tools, and agricultural activities. The optimum temperature for germs development is 25-30°C. The optimum temperature for conidial germination and infection is 28°C. High temperature, rainy weather, closed climate, and high humidity environment are all favorable and popular. The occurrence of celery cultivation with high density, large temperature difference between day and night, long dew condensation time, high management temperature, lack of fertilizer, lack of water or irrigation, and weak growth is more severe.
Prevention points
To adjust the temperature and humidity of the seedbed, separate the seedlings when the seedling grows to two leaves and guard against seedlings. The spraying of Aoli-Ke-Shuangruer 500 times liquid at the seedling stage can prevent seedling stage disease; strengthen field management: high ridge cultivation, reasonable fertilization, timely mulching after planting and replanting, and promotion of new roots. In the greenhouse, it is necessary to control the temperature and humidity and strengthen the management of ventilation and light transmission. During the result period, the lower diseased leaves should be regularly removed, buried deeply or burned so as to reduce the chance of disease transmission. Soaking seeds in warm water at 48°C for 30 minutes, removing and soaking in cold water for 15 minutes, sowing the buds. Shading and cooling can effectively prevent the occurrence of the disease. Strengthening fertilizer and water management, releasing air and reducing humidity, doing a good job in field sanitation, and removing sick bodies can suppress their occurrence. At the beginning of the disease, 5% chlorothalonil dust or 5% mothionine dust can be used for 1 kg spray per 667 square meters; 10% chlorothalonil smoke smoke; 50% carbendazim 500 times or 40% sulfur glue Suspension 800 times or 70% Thiophanate 600 times spray.
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