The Cause and Prevention of "Cow Tail" in Summer Maize

In recent years, in the summer corn field, some corn seedlings are deformed and distorted, and they are severely whip-like. This phenomenon has also occurred from time to time. Now the cause of the disease has been introduced: If the corn injury caused by herbicides is severe dwarfing, the heart leaves are distorted and cannot be spread, and there is a phenomenon of distorting the leaves without twisting the leaves. Damage may be caused by the application of nicosulfuron-containing corn post-emergence herbicides. The main reasons for this phenomenon are: (1) Because some of the homemade nicosulfuron is not pure enough, it causes phytotoxicity. (2) Spraying or re-spraying at high temperatures also causes phytotoxicity. (3) When the herbicide is applied too late, the corn will cause damage to the onion tube leaves. Control measures: After the occurrence of phytotoxicity, such as the distorted heart leaf is not serious, does not affect the Tianshao out, can recover nitrogen fertilizer and watering, can restore normal growth after one week. If it is severely twisted, the twisted heart should be manually broken and fertilized with water. Some foliar fertilizers can be sprayed and some zinc and boron fertilizers can be added. Infestation caused by pests When corn shows signs of distorted leaves, broken leaves and shrunken leaves, and rows of holes appearing on the leaves, it is most likely to be caused by the damage of the thrips or Swedish fly during the 5-6 leaf stage of the corn. There is a transparent film on the front of the leaf. Some of the leaves have mucus, and the heart leaves do not stretch properly and twist like a cow's tail. Preventive measures: should be in the early stage of prevention and treatment, seedling can be used 10% imidacloprid WP 20 grams, watered 30 kg spray, focus on spraying corn leaves. In the later period, the heart and leaves of the injured seedlings should be artificially broken, in particular, the twisted parts should be opened, and then the drug should be used for prevention and treatment. At the same time, it is best to add some foliar fertilizer. Physiological diseases are also caused by excessive N fertilizer application and excessive vegetative growth, and they also have a certain relationship with the characteristics of the varieties. Preventive measures: artificial stripping, assisted pumping.

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