Bacterial blight is the main disease of celery in protected areas in winter and spring. According to the survey, the disease has recently begun to occur. If the control does not directly affect the yield and quality of celery.
Symptoms: Spot blotch in celery is also known as leaf blight. Leaf, petiole, stem can be infected. General old leaves first attack, then spread to new leaves. The lesions on the leaf were scattered and varied in size. The lesions were pale yellowish water-stained, nearly round and small spots, and gradually enlarged. Multiple lesions were connected together. The outer edges were mostly dark red-brown and obvious, forming irregularities. In the large plaque, the diseased part of the disease faded into gray and white, and many black spots were raised in the middle. The petiole and stem were infected, the lesion was grayish white, the oblong circle was slightly sunken, and the diseased part had yellow halos around the edges, and many raised black dots were formed on the lesions.
Occurrence characteristics: The disease is susceptible to cold and high humidity conditions, the temperature of 20 ~ 25 °C, relative humidity more than 95% of disease severity. In addition, continuous overcast rain, low temperature, large temperature difference between day and night, nighttime fog or long dew condensation time, and when the plant grows weak, it is conducive to occurrence and prevalence.
Control methods: Strengthen field management, see seedlings and increase plant resistance to disease. Conservation cultivation should pay attention to cooling and evacuation, control during the day at 15 ~ 20 °C, higher than 20 °C when the timely release of wind, night control at 10 ~ 15 °C, reducing the temperature difference between day and night, reduce condensation, avoid flooding irrigation. At the beginning of the disease, 70% mancozeb WP can be used 600 times; or 72% Kelu WP can be used 600-800 times, or 69% AZM WP can be sprayed with 800-1000 times.
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