The greenhouse leek plague is a weak parasitic seedling, which is mainly caused by the spread of water. At the beginning of the disease, some yellow needles on the tip of the tip appeared. Finally, the lesions were connected into pieces. In severe cases, the leaves were dried and dried, which affected the new yield and quality of the leek. The main prevention measures are:
Small water pouring
The disease spreads by water, such as flooding, which can easily cause excessive humidity in the room, making the disease spread. In addition, attention should be paid to the application of phosphorus and potassium fertilizers when topdressing, and the excessive nitrogen fertilizer will cause the spread of the disease.
Picking up dead leaves
When the leaves of the residual disease fall to the ground, they should be cleaned and ventilated in time to reduce the source of indoor bacteria.
Ventilation in time after watering
The indoor temperature is too large and it is prone to disease. Therefore, after each watering, it should be ventilated in time to reduce the indoor temperature. The wind should be selected at noon on a sunny day. The ventilation time should be 2 to 3 hours. The area of ​​the greenhouse should be 40 to 50 square meters. The area should not be too large.
Spray control
Indoor detection of leek disease leaves, timely chemical control, can be sprayed with 50% carbendazim WP 500 times or 40% Ethyl aluminum WP 400 times, spray every 7 to 10 days, continuous Spray 3 times to get good results. Do not use too much concentration when spraying, so as not to cause phytotoxicity.
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