In recent years, there has been a whip-like distortion of the heart and leaves of corn in some of the summer corn planting areas in Guangrao County, and will occur from the emergence of maize to the tasseling period. After field investigation and analysis, there are three main causes of this phenomenon. 1. Improper use of herbicides. After corn seeding, improper use of acetochlor, metolachlor and other herbicides in the soil before closing the seedlings caused the shrinkage and twisting of the young leaves. The “D†shaped seedlings were formed and the plants were dwarfed. Use nicosulfuron and other drugs during corn growth, if corn seedlings are younger than 3 leaves or more than 5 leaves, or if they are applied under high temperature conditions, or if they are used excessively, or applied within 7 days before and after application of herbicides. Phosphorus pesticides, 3 to 7 days after application will appear heart leaf curling, leaf shrinkage, and irregular yellow drug spots and other phenomena, when the heart rot. For corn seedlings that are subject to phytotoxicity and growth malformation, most plants will naturally resume normal growth when the symptoms are mild, and the heart leaves may be severely distorted so that the tassels can be extracted normally, and timely fertilization of the affected fields is beneficial to the plants. Restore growth as soon as possible. 2. Hummer hazards. Corn is often harmed by thrips in the 3 to 5 leaf stage, and the severely damaged plant leaves curl into a whip. The inside leaves cannot be extracted normally. There are chlorotic dots on leaves damaged by thrips, and a large number of thrips are visible on stripping leaves. 10% imidacloprid wettable powder, 1.8% abamectin EC, 25% thiamethoxam water dispersible granules spray can be used, focusing on the heart and leaf back spray. Seriously deformed plants need to manually dissect the twisted heart. 3. Under special climatic conditions, some species have abnormal growth and development. The distorting of the heart mainly occurs before the male tassels. The heart leaves are whip-shaped, and the top is swaying to one side. A large number of corn varieties at the same time on the deformity, mostly due to physiological factors, the induced climate factors have long-term low temperature and humidity in the early growth period, the trumpet met with high temperature and drought. When the twist is severe, it is necessary to cut the curled heart blade longitudinally with a knife so that the tassel can be withdrawn normally.