What about the latest corn heart leaf curling?

Corn is an important cash crop in China, and it is the main source of income for many farmers, but many people are asking about the phenomenon of corn heart leaf curling, which means that the heart leaf of the seedling is twisted and can not be carried out in time, seriously affecting the growth in the later stage. So what is the cause of corn heart leaf curling? How to prevent and cure it? Let's get to know it.

1. High temperature and drought

In a high temperature environment, when the soil is dry and the roots absorb insufficient fertilizer and water, they will choose heart leaves to roll, which is different from the adaptability of maize varieties to climate, and the proportion of heart leaves will also be quite different. Field drought normal heart leaf curling, generally with the improvement of soil moisture will gradually recover, after rain or irrigation recovery faster, or can also spray some foliar fertilizer, can also promote recovery.

2. Drug damage

Herbicides are used to control weeds during the growth of corn, if the seedling age of corn is less than 3-5 leaves, or if the pesticide is sprayed in a high temperature environment, or the concentration is too high or the dosage is too high, the phenomenon of heart leaf curling and leaf shrinkage will occur after 3-7 days of application, and will be accompanied by irregular yellow spots and serious heart leaf rot. Most of the plants will return to normal growth with the relief of symptoms, and the serious heart leaves can be cut open artificially. For the seriously damaged soil, it is necessary to water and spray foliar fertilizer in time to promote plant recovery.

3. Insect pests

There are two kinds of pests that cause corn heart leaves to curl, one is thrips, which is generally damaged in corn 3-5 leaves, which will form whips in corn heart leaves, and the leaves can not be pulled out in time, and chlorotic spots will be selected to the leaves, and thrips can be seen by peeling happy leaves. You can choose to spray and control with acetamiprid and ethyl spinosad. There is also a kind of harm caused by typical stalk flies, also known as rye stalk flies, the larvae drill into the harm between the heart leaves, causing damage to the heart leaves, and the secretions will stick to the heart leaves tightly, so that they can not expand, but the lower leaves will continue to grow and can be controlled by spraying insecticides. at the same time, combined with spraying trace elements to promote the plant to return to normal growth.

4. Top rot

The disease can be harmful at any growth stage of maize, when the outermost leaves of the heart leaves tightly wrap around the inner leaves, so that the leaves can not expand normally, the leaves will be deformed, wrinkled or twisted, and heart leaf diseases are common rot, dry rot or wet rot. For this disease, carbendazim and chlorothalonil can be sprayed at the initial stage of the disease, and the effect is good.

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