Question: The reader asked: What are the causes of the dry tip of green onions and how to prevent it?
Wang Zaiqiang replied: There are two reasons for the appearance of green onions:
One is a physiological disease. The main reason is due to: 1. Excessive soil moisture. The soil has been in a wet state, causing a smoldering hazard, causing some of the roots to suffocate and dying. The phenomenon of yellowing of the leaves appeared on the ground; 2. The air humidity was too high. There is a layer of wax on the surface of the onion leaves, which has the function of protecting the water from being dispersed, and the transpiration is small. The rainy days are more, and the air humidity is relatively high, which inhibits the transpiration. Root absorption is reduced, and long-term lack of fertilizer elements can also cause yellowing of the leaves.
The other is a pathological disease caused by the disease. It is prone to occur under high temperature and high humidity conditions. Cloudy rain and excessive humidity are the main causes of the onion disease. In the early stage of the disease, the lesions were dark green, flooded, and after the enlargement, they were gray spots. The surrounding area was not obvious and the leaves were withered. When the disease was severe, the field was white.
Control methods:
1. Deep ploughing the soil before planting strengthens the soil water infiltration. After the planting, the top dressing supplements the nutrient insufficiency and reduces the occurrence of physiological diseases.
2. Spraying of metalaxyl or urea manganese zinc and other mildew disease drugs plus foliar fertilizer and silicone to prevent stem tip diseases caused by downy mildew.
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