First, the symptoms of celery leaf blotch, also known as leaf blight. Celery leaves, petioles, stems can be infected. The old leaves first became infected, and they spread to new leaves. The lesions on leaves were scattered and varied in size ranging from 3 to 10 mm in diameter. They were initially light brown and stained with small spots. Afterwards, they gradually enlarged. The central part was brownish and necrotic. The outer edges were mostly reddish-brown and obviously scattered in the middle. Black spots. Some lesions are yellow-white or gray-white in the center, and many black dots are formed on the edges. The lesions often have a circle of yellow halos outside the lesions, with lesions of different diameters. The petiole or stem was infected, the lesion was brown, the oblong was slightly sunken, and the center had scattered black dots. At present, the disease has become an important disease of celery in winter and spring protected areas, and has a great impact on the yield and quality. Second, control methods (a) the selection of disease-free seeds, or disinfection of diseased seeds. From the disease-free plant or the storage of two years of Chen species, such as the use of new species to be soaked in warm water, that is, 48 ​​°C ~ 49 °C water soaking for 30 minutes, stirring while dipping, after moving into cold water to cool, dry After sowing. (b) Strengthen the management of the field, apply the base fertilizer, see the seed dressing, and enhance the disease resistance of the plants. (C) Protected cultivation should pay attention to cooling, dehumidification, daytime temperature control at 15 °C ~ 20 °C, higher than 20 °C to release air in time, the temperature is controlled at 10 °C ~ 15 °C, reducing the temperature difference between day and night, avoid flooding irrigation. (d) Protected areas of celery seedlings are prone to disease when they are 3 cm high, and 45% of chlorothalonil can be smoked. The dosage is 200-250 grams per mu. Can also spray 5% chlorothalonil dust agent, 1 kilogram per acre.
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