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The green onions dry tip has become a major obstacle to the quality and yield of welsh onion, which often causes a decline in quality and yield, directly affecting the economic benefits of vegetable farmers. Therefore, it is very important to understand the causes of the green onions and take targeted countermeasures. The onion dry tips are divided into two types: physiological dry tips and pathological dry tips. The latter, "white dry" and "green dry," often make the onion cultivators unclear, and it is difficult to prescribe the right medicine, leading to miss the best timing for prevention and treatment. Here, briefly explain the causes of the two symptoms and prevention measures. White dry: It is caused by epidemic diseases. It is prone to occur under high temperature and high humidity conditions. The heavy rainfall in the case of cloudy days is also the most important cause of the current development of green onions. 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. Anti-pharmaceutical agents can be selected from Prokl, metalaxyl manganese zinc, dimethomorph Mn zinc and so on. However, it should be noted that because there is a layer of wax on the surface of the onion leaf, it is necessary to pay attention to the addition of silicone additives during spraying to improve the adhesiveness of the agent. Qing Gan: Damaged by gray mold. The disease is seriously ill at night when the temperature is low and the humidity is high. Now it has gradually become a secondary disease. At the initial stage of the disease, there were white spots on the leaves, nearly round or oval, with a diameter of 1-3 mm, which developed from the tips of the leaves and gradually became flaky, causing the onion leaves to curl and die. Anti-pharmaceutical agents can be used for acetaminophen, sucrose, nicotinamide, etc. Silicone additives are also added to improve the control effect. In addition, seed flies can also cause sharp green onions, seed fly larvae infestation of onion root damage, pull up the onion can be seen after the roots become brown, causing the aboveground tip dry, severe root rot or dead, available 2.5% amethrin Ester spray control.