What disease is bean leaves turning yellow?

1, long-term application of chemical fertilizer, farm manure decreased, leading to soil hardening.

2. In recent years, it is very common to use combine harvester to harvest wheat, burn wheat stubble and destroy soil surface structure.

3, the density is too large, and the leaves turn yellow due to insufficient ventilation.

4. Lack of trace elements. The leaves at the top growth point appear yellow and white, which is caused by iron deficiency and zinc deficiency. The yellowing of new leaves at the top usually occurs when it suddenly clears up after shading, the root system grows poorly, the weather turns from cold to warm, and there are too many fruits in the early stage.

5. Plant growth is poor. This situation will not lead to plant death, mainly because the plant growth is not good, resulting in yellowing in the middle of the veins of the middle and lower leaves, which is easy to cause premature aging of the plant. For example, too high temperature in the shed, poor root development, root injury, and unscientific supply of fertilizer and water will all cause similar situations.