All along, the green onions are the most difficult problems for onion farmers. 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 and delay the best time for prevention and treatment. I remind the majority of onion farmers, pay attention to identify the symptoms, scientific prevention.

The so-called "white stem" of green onions is caused by epidemics. The disease belongs to soil-borne diseases and is prone to occur under high temperature and high humidity conditions. The heavy rainfall in the case of cloudy days is also the main 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 there is a layer of waxy layer on the surface of the onion leaf, it is recommended to add silicone additives when spraying to improve the adhesiveness of the drug.

The onion “green stem” is the cause of gray mold. The disease was seriously affected by the low temperature and high humidity in the previous night, and it has gradually become a secondary disease. At the initial stage of the disease, there were white spots on the leaves, nearly round or elliptical, with a diameter of 1 to 3 mm. They 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.

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