In the growing season, the leeks often have dry and yellow leaves, which seriously affect the quality of leeks. Many vegetable farmers have frequently changed pharmaceutical control, but they have had little success. Sang Peiming, Sangjiayingzi Village, Wenjia Street, Shouguang City, believes that: â€œInsect pests and diseases can cause dry and yellow leaves of leeks, and many vegetable farmers only know how to replace drugs for on-ground prevention and control, while neglecting underground pests, making the prevention and control effects not effective. I am using the method of preventing pests first, and this year, the leek did not produce any dead leaves or yellow leaves."
First of all, the roots will be pest-pretreated in advance, focusing on the prevention and control of onion fly and late-spotted mosquitoes (also called ticks). The main cause of underground damage to leeks is onion flies and cockroaches. These two kinds of pests dig into the leek bulbs for feeding, making the bulbs eaten into empty holes, which can easily cause the roots to rot and the leaves to be yellow, causing serious death and death. During the prevention and treatment, 5% phoxim granules per acre were added to the leeks and then covered with soil. If larvae are harmed, it is found that the tips of the leaves begin to yellow and become soft to the ground and can be controlled by irrigation. 75% phoxim EC can be used 500 times liquid, splitting the rhizosphere topsoil and sprinkling the roots.
Second, the key pest control and gray mold in the leaves. After the leeks were infected with the disease, water-stained lesions appeared on the affected parts. The diseased parts of leaves and floral moss were dark green, but the roots and bulbs were light brown, and the diseased parts had no obvious edges. When the dampness occurs, the diseased part produces white sparse mildew, and when it is dry, the diseased leaves turn into a yellowish color, causing the ground part to collapse or dry. After an epidemic occurs, it is necessary to promptly reduce the humidity. In the early stage of the disease, 58% metalaxyl Mn-Zn may be used as a 500-fold solution or 40% EB-200-300 times as a control solution, once in 7-10 days. When Botrytis cinerea occurs, white or 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, and finally the lesions form a continuum and the diseased leaves dry up. In addition to control and drainage in addition to wet down, available 50% speed Keling 1000-1500 times liquid, spray once every 10 days.
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