How to control the gray mold of celery
A disease newly occurred in the greenhouse in recent years. Generally, it is a local disease. In the early stage of disease, there are many leaves from the plant that have condensation, or the leaves from the lower part of the wound. They invade from the petiole or the weak yellow leaves. The water is initially immersed and the disease is softened, rotted, or wilted. A gray mold layer can emerge from the diseased part, which will cause the whole plant to rot in long-term high temperatures. From December to May of the next year, the disease usually occurs at a temperature of about 20°C and a relative humidity of 90% or more.
Control methods: (1) Strengthen the ventilation and temperature management of the greenhouses, and ventilate them in the morning and evening on sunny days to increase the temperature of the greenhouses quickly. When the temperature of the greenhouses rises to 33°C, ventilation is started. The temperature of the greenhouses is reduced to 25°C or more, and ventilation is continued at noon to make the greenhouses In the afternoon, the temperature is kept at 20°C~25°C; when the temperature of the shed is lowered to 20°C, the top vent is closed, and the night temperature of the shed is maintained at 15°C~17°C. Open vents for ventilation on a cloudy day. 2 Watering should be carried out in the morning. 3 available field in addition to 600 times liquid spray control, when the disease can be sprayed gray mold spraying 300 times.
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