Onion, alias garlic, is a common vegetable that has the effect of clearing away heat and detoxification. The onion is more adaptable and simple to plant, but recently farmers have reported that the onion leaves are dark brown and form lesions. This is actually the onion leaf miner, which is widely distributed in places with allium crops, and the damage is great. The following is a small series to introduce the characteristics and control measures of onion leaf miner. 1. The occurrence characteristics of onion leaf miner Onion leaf miner is a species of Diptera, Liriomyza, commonly known as meat. It is mainly harmful to the leaves. The larvae sneak into the mesophyll in the leaves, and the snakes form a meandering serpentine channel on the leaves. The leaf epidermis is grayish white. In severe cases, more than 10 larvae are damaged on one leaf, causing the leaves to wither, affecting photosynthesis and causing yield reduction. Onion leaf miners began to occur in mid-May. Adults produced eggs in the epidermis of onion leaves, hatching larvae in 4-5 days and subtiling mesophyll in leaf tissue. June-July is a period of great damage. In the northwest, 4-5 generations can occur in a year, and the generations overlap. Adults are active during the day and tend to be strong in sweet juice. 2. Control measures for onion leaf miner From the occurrence of onion leaf miner, May-July is the key prevention and control period, the peak of hatching eggs and the control of young larvae. Generally, from May, sporadic adult insects take food spots or insects, and then start drug control. The main choices for prevention and treatment include: vitamin A salt, cyhalothrin, acetamiprid, avid insecticide, carbaryl salt, acetamiprid, and avidin. Spraying should be sprayed evenly on the surface of the onion plants and plants at 9-10 am, and then control once every 7-10 days. According to the adult has a strong tendency to sweet juice, so you can use the sweet and sour liquid to trap, the sweet and sour liquid formula is 1 part sugar, 1 part of vinegar, 2.5 parts of water, can add a small amount of enemy white worms and mix well, with containers Good to place in the field to trap the adult. In addition, we must pay attention to clear the weeds in the field and next to it, remove the damaged leaves in time, reduce the source of insects; implement formula fertilization or balanced fertilization, strengthen water and fertilizer management, and make plants grow vigorously, which can reduce the harm. The above is the occurrence characteristics and control measures of the onion leaf miner. Once the onion leaf miner occurs, it will reduce the yield and the onion will die. Therefore, the farmers must pay attention to it. It is hoped that the farmers will master the above control measures and prevent it in time. For the wonderful pictures and popular comments on the onion leaf miner, you may be interested in the following recommended content, welcome to read.
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