The Latest Detailed Explanation of the Causes of Yellow Leaves in Rice and the Control Methods

During the growth of rice, yellowing of the leaves is a common phenomenon, and many farmers encounter this situation. There are many causes of yellow leaves in rice. Below, the editor has summarized them and brings you the causes of yellow leaves in rice and the control methods. Let's take a look together.

1. Toxic yellow leaves

Toxic yellowing of rice leaves is actually quite easy to identify. Looking at the root system, the symptom of blackened roots is extremely obvious, and it is also accompanied by a rotten egg smell, which is extremely noticeable.

Control method: For toxic yellowing of leaves, drain the water and sun the field in time. The purpose is to let the soil obtain more oxygen, use oxygen to detoxify, and then apply a compound fertilizer or spray a foliar fertilizer to promote the rice's recovery.

2. Yellowing due to nitrogen deficiency

When rice leaves turn yellow, many people's first reaction is that it is caused by a nutrient deficiency. Indeed, when rice lacks nitrogen, it causes yellow leaves. It is also relatively easy to judge: generally, the old leaves turn yellow first, then it gradually spreads to the heart leaves, and gradually spreads to the entire plant. Seen from a distance, it looks as if the rice is ripe.

Control method: For yellowing of leaves caused by nitrogen deficiency, applying urea is enough. It is recommended to start applying it in the early stage of yellowing, and not wait until the whole plant turns yellow before applying it, because by then it is already too late.

3. Herbicide phytotoxicity

Phytotoxicity caused by herbicide chemicals can also cause yellow leaves in rice. In mild cases, yellow spots appear on the leaves, and then the rice withers and wilts; in severe cases, the entire plant dies. This is typical herbicide phytotoxicity.

Control method: If herbicide phytotoxicity is discovered early, spray clean water as soon as possible to reduce the herbicide concentration. If it is discovered relatively late, when the rice has already withered, then there is no saving it.

4. Bacterial diseases

There are many bacterial diseases that can cause yellowing of rice leaves, such as bacterial leaf blight, bacterial leaf streak, and bacterial foot rot. After infection, the heart leaves of the rice will wilt and curl. If it is bacterial leaf streak, breaking the diseased plant will produce yellow “bacterial ooze”; if it is bacterial foot rot, breaking the diseased plant will give off a putrid smell.

Control method: Bacterial diseases are not difficult to control. They can be controlled by spraying agents such as bismerthiazol, agricultural streptomycin sulfate, and thiosen copper, generally once every week.

The above is an introduction to the causes of yellow leaves in rice and the control methods. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.