How to prevent greenhouse leek disease

In recent years, greenhouse leek disease has spread. The pathogen is a weak parasitic seedling, which is mainly caused by the spread of water. At the early stage of disease, some sharp-pointed yellow dots appear at the tips of the leaves, and finally the lesions form a contiguous piece. In severe cases, the leaves are dried and dead, affecting the new yield and quality of the leek. Its main control measures are:
Water pouring. The epidemic is spread by the currents, such as flooding, which can easily lead to excessive indoor humidity and spread of the epidemic. In addition, when topdressing, it is necessary to pay attention to topdressing the application of phosphorus and potassium fertilizers, and more nitrogenous fertilizers will cause the disease to spread.
Pick up dead leaves. When the diseased leaves are dry and fall on the ground, they must be picked up and ventilated in time to reduce the indoor bacteria source.
Ventilate immediately after watering. Indoor temperature is too high, prone to epidemics. So after each watering, ventilation should be timely to reduce the indoor temperature. Exhalation should be carried out at noon on sunny days. The ventilation time should be 2 to 3 hours, and the area of ​​the shed should be 40 to 50 square meters. The area should not be too large.
Spray control. The leek leaves in the room must be promptly treated with chemicals. It can be sprayed with 50% carbendazim WP 500 times solution or 40% EDP WP 400 times, spray once every 7-10 days, continuous Spray 3 times, you can receive good results. Do not over-concentrate when spraying so as not to cause injury.

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