What about the curling of corn heart leaves?

Corn is an important cash crop in China, and it is the main source of income for many farmers. However, many people are asking about the phenomenon of corn heart leaf curling, which means that the seedling heart leaf is twisted and cannot be unfolded in time, which seriously affects the late growth. So what causes corn heart leaf curling? How to prevent it? Let's get to know each other.

1. High temperature and drought

In high temperature environment, soil drought, root system absorption of fertilizer and water is insufficient, will choose the heart leaf curl, this and corn varieties to climate adaptability is different, the proportion of heart leaf curl will also exist greater differences. The normal heart leaves in the dry field will gradually recover with the improvement of soil moisture. After rain or irrigation, the recovery will be faster, or some foliar fertilizer can also be sprayed to promote recovery.

2. Phytotoxicity

During the growth period of corn, herbicide is used for weeding. If the seedling age of corn is less than 3-5 leaves, or the pesticide is sprayed under high temperature environment, or the concentration of the pesticide is too high and the application amount is too large, the phenomenon of curling of the heart leaves and shrinking of the leaves will occur after 3-7 days of application, accompanied by irregular yellow spots, and serious decay of the heart leaves. Most plants will resume normal growth with the alleviation of symptoms. The heart leaves with serious heart leaves can be artificially opened. For the soil with serious damage, watering and foliar fertilizer should be sprayed in time to promote plant recovery.

3. Pests

There are two kinds of insect pests that cause corn heart leaves to roll, one is thrips, generally in corn 3-5 leaves suffer, will form whiplash to corn heart leaves, leaves can not be extracted in time, but also to leaves select chlorotic spots, peel the heart leaves visible thrips activity, can choose to spray control with nitenpyram, ethyl spinosad. There is also a kind of damage from the stem fly, also known as the black wheat stem fly. The larvae drill into the damage between the heart leaves, causing the heart leaves to be damaged. The secretions will stick tightly to the heart leaves, making them unable to expand, but the lower leaves will continue to grow. It can be controlled by spraying chemicals. At the same time, it can be combined with spraying trace elements to promote the normal growth of plants.

4. Top rot

The disease can harm corn at any growth stage. When it is harmed, the outermost leaves of the heart leaf tightly wrap the inner leaves, making them unable to unfold normally, and the leaves will be deformed, wrinkled or twisted. The heart leaf disease often rots, dry rot or wet rot. For this disease can be sprayed in the early stages of carbendazim, chlorothalonil and other chemicals control, the effect is better.

The above is how to do corn heart leaf roll introduction, hope to help you, want to know more related knowledge, please pay attention to us.