In recent years, there has been a phenomenon that the corn leaf is distorted and whip deformed in some summer corn planting areas. It will occur from corn emergence to tasselling. After field investigation and analysis, there are mainly three reasons for this phenomenon.
1. Improper use of herbicides after sowing Maize seedlings, such as acetochlor and metolachlor, are used to close the treatment of herbicides, causing the shrinkage and twisting of young leaves. The “D†shaped seedlings are formed and the plants are 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 return to 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. Thrips are harmful to corn in the period of 3 to 5 leaves. The damage to plants is often caused by curling of the heart of the injured plant 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. Can choose 10% imidacloprid wettable powder, 1.8% abamectin EC, 25% thiamethoxam water dispersible granules spray, focusing on the heart and leaf blade dorsal spray. Seriously deformed plants need to manually dissect the twisted heart.
3. Under special climatic conditions, distorted leaves of some species due to abnormal growth and development mainly occur before the male tassels. The heart leaves are whip-shaped, and the top of the leaves is twisted 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 high 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.
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