In the growing season, the leeks often appear dry and yellow, which seriously affect the quality of leeks. Many vegetable farmers have frequently changed pharmaceutical control, but they have had little success. The author believes that insect pests and diseases can cause amaranth leaves to dry, yellow, and many vegetable farmers only know that the replacement of drugs for ground control, and omission of the underground pests, making the control effect is not good. If the method of preventing insects after pest control is adopted, it can be ensured that the leek and yellow leaves do not appear in the leek.
First of all, the roots in front of pest control. Focus on the control of onion fly and late-wing gnat mosquitoes (also known as cockroaches), these two pests drilled into the leek bulbs for food, making the bulbs eaten into empty, easy to cause root rot, yellow leaves, severe dry death. During the prevention and treatment, 5% phoxim granules per kilogram of 2 kg of fine soil are sprinkled near the leek root and covered with soil for prevention and treatment. If larvae are harmed, it is found that the tip of the leaf begins to yellow and become soft and lodging on the ground. It can be used for prevention and control. It can use 75% phoxim 500 times solution, breaking the top soil in the rhizosphere and sprinkling the roots.
Second, the key pest control and gray mold in the leaves. After the leek was infected with the epidemic, water-stained lesions appeared on the affected parts, and the leaves and calyx disease were dark green, while the roots and bulbs were pale brown, and the diseased parts had no obvious edges. After the epidemic occurs, we must promptly reduce the humidity. In the early stage of the disease, we can use 58% metalaxyl Mn-Zn 500 times solution or 40% phosphine aluminum 200-300 times solution to spray, and spray once every 7-10 days. In the case of gray mold, the white and light brown spots appear on the front and back of the leaves. As the disease progresses, the lesion expands into a fusiform or elliptical shape. Finally, the lesions form into patches and the diseased leaves dry up. In addition to control and drainage in addition to wet down, 50% speed Keling 1000-1500 times spray, spray again about 10 days.
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