Sharp green onions are a major obstacle to the quality and yield of Chinese welsh onion, which often causes the quality of welsh onions to decline and the yield to decrease, which directly affects the economic benefits of vegetable farmers. In recent days, farmers have asked questions about green scallions and dry tips. There are many reasons for this, and it is very important to understand the causes of the sharp scallions and take targeted countermeasures. The onion dry tips are divided into two types: physiological dry tips and pathological dry tips. The “green stem†and “white stem†in the latter often discriminate the onion farmers, making it difficult to prescribe the right medicine, leading to missed optimal timing. The following details how to distinguish between "Qinggan" and "White Dry."
"Qinggan" is due to the damage caused by gray mold. The disease is heavy at night when the temperature is low and the humidity is high. 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 may use prohexine, saoxin, nicotinamide, etc., and silicone additives may be added during spraying to increase control efficiency.
"White dry" is caused by the disease, and it is prone to occur under high temperature and high humidity conditions. The incidence of heavy rainfall in the case of cloudy days is also the most important cause of the current development of green onions. In the initial stage of the disease, the lesions were dark green, immersed in water, and after the enlargement, they were grayish-white lesions with indistinct edges and withered leaves. When the disease is severe, the field is white. Polic and metalaxyl manganese zinc can be used as control agents. However, it should be noted that there is a layer of wax on the surface of the onion leaves, and silicone additives must be added when spraying to increase the adhesion of the chemicals.
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