During the growth of corn, it often encounters the distortion of the heart leaf, the growth of the skew, etc., usually caused by one or multiple reasons. The specific details are as follows: Replacement Uv Lamp,,Uvc Disinfection Lamp ,Amalgam Uv Light ,Germicidal Uvc Lamp Foshan Kingrate Optoelectronic Technology Co., Ltd. , https://www.kingrateuv.com
1. Abnormal growth caused by physiological incompatibility. This is the most common cause. Some varieties have poor long-term low temperature and high humidity due to poor resistance to stress, and they often cause abnormal growth and development when they encounter long-term effects such as high temperature and drought. The heart leaves are twisted and rolled into a whip, and the top is twisted to one side. The light ones naturally unfold, which has little effect on the yield. The severe ones have reduced production due to tassel dysplasia. It usually occurs early in the 3~5 leaf stage, and occurs late in the period from the big mouth to the early stage. For the diseased field, the leaves can be artificially stripped, and the leaf surface is sprayed with brassinoside or foliar fertilizer to enhance the resistance of the corn to accelerate its recovery. At the same time, strengthen field management, pay attention to flood control, scientific fertilization, and enhance the resistance of corn plants.
2. Hummer pests such as thrips. It mainly occurs in the 3~5 leaf stage. The Hummer likes to feed on the young unextracted heart leaves, causing the heart leaf to not expand normally, curling like a whip, or even unable to pull out normally. The leaves are spotted yellow mottled with silvery white streaks, and the peeling of the leaves reveals a large number of thrips feeding. Before planting, imidacloprid or butyl thiocarbazone seed dressing can be used to prevent seedling pests, or post-emergence with 10% imidacloprid wettable powder or 1.8% avermectin EC 2000 times solution to control thrips.
3. Damage caused by herbicide phytotoxicity. Some corn varieties are sensitive to herbicides, and if the period of use is inappropriate or the dosage is too large, it is easy to cause phytotoxicity. It usually occurs in the 5~8 leaf stage, and occurs 3~7 days after spraying the herbicide. The heart leaves are curled, the leaves are shrunk, there are irregular yellow plaques on the leaves, and no pests are found in the heart leaves. In severe cases, the heart leaves will rot, like a top rot. The field is accompanied by clusters of dwarf plants and necrosis after growth point. The instructions for the use of herbicides must be strictly observed to avoid the occurrence of such phytotoxicity.
4. Corn top rot causes heart leaf distortion. Corn top rot can occur in all stages of corn growth. The outer leaves only wrap the inner heart leaves, making them unable to unfold and whip. The leaves are deformed, shrunk or twisted. Rotting is often seen at the base of the heart leaf, dry rot or Wet rot, which is usually caused by Fusarium or a variety of bacteria. At the beginning of the onset of rot disease, 58% of metalaxyl and manganese zinc 300 times liquid spray can be used for prevention and treatment.
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