Recently, many farmers have asked me to take corn to the station. Some corn seedlings in their corn fields can't start distorting their heart and leaves. Severe ones are big whip-shaped. Tassels cannot be extracted normally. Not full, this phenomenon has also occurred in previous years, now the causes and preventive measures are described as follows:
First, weed killers. Reasons for the occurrence: The corn fields in question are all treated with nicosulfuron-methyl post-emergence herbicides. There are three reasons for this: 1. Spraying at high temperatures or reinjection can also cause phytotoxicity. 2. The age of corn over 5 leaves, or the liquid sprayed into the heart, causing distortion, leaves turning white, or rotten heart. 3. When the herbicide is applied too late, corn will produce phytotoxicity on the onion tube leaf, which is mainly due to the sensitivity of certain hybrid varieties to the occurrence of such symptoms, resulting in the failure of normal panicle extraction.
Preventive measures: After the occurrence of phytotoxicity, such as the distorted heart is not serious, does not affect the Tianshao out, can recover nitrogen fertilizer and watering, can be restored to normal growth after one week. If it is severely twisted, the twisted heart should be removed manually and fertilized with water. Spray some foliar fertilizer and add some zinc and boron fertilizers.
Second, caused by pests. Primarily, the adult thrips of the corn are sucked and damaged by the adults on the back of the heart leaves, and a large number of intermittent white dots or silver-white striped patches appear on the leaves, accompanied by small stains, and the part opposite to the silver-white streak on the front of the leaf is yellow streaks. , Heart broken, deformed plant upper leaves. After the corn seedlings are injured, the heart leaves do not stretch properly and are distorted as "thin" or "tail-like".
Preventive measures: This kind of pest should be controlled at an early stage. After the heart of the corn is curled, the control effect of the drug is not good. First of all, in the seedling stage can be used 10% imidacloprid WP 20 grams or 5% acetamiprid WP 20-30 grams, watered 30 kg spray. The medication site is corn heart leaf. In the middle and later stages, the heart and leaves of the injured seedlings should be artificially broken, and the twisted parts should be opened, followed by medication, and some foliar fertilizers should be added at the same time.
Third, physiological diseases. It is mainly caused by too much nitrogen and excessive fertilizer, resulting in excessive nutrient growth, and it is also related to the characteristics of varieties.
Preventive measures: After discovery, they should be manually stripped and assisted in pumping.
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