Causes and control methods of yellowing of bean leaves

Beans are one of our common vegetables, which are on the market in spring and summer, but during the growth of beans, many farmers found that the leaves of beans were yellowing, which seriously affected the growth of beans. So what is the reason for the yellowing of bean leaves? How to prevent and cure it? Let's take a look.

1. Occurrence of symptoms

Bean yellow leaves generally have two cases, one is the bottom leaves yellow, very easy to fall off, but also the phenomenon of upward expansion, the phenomenon of dead trees. There is also a yellowing phenomenon of new leaves at the top, accompanied by falling flowers and fruit; there is also a relatively rare phenomenon that planting trees will not die, but the veins that love him will yellowing.

2. The cause

There are three main reasons for the yellowing of bean leaves, one of which is infected with root rot, which is a disease transmitted through soil. The pathogen invades the root system in the early stage, resulting in poor plant growth and gradual yellowing of the bottom leaves. The plant will wither during the period of high temperature and strong light at noon, recover sooner or later, and finally die. The second is the lack of trace elements, the yellowing of the top leaves is caused by the lack of iron and zinc, while the new leaves at the top are caused by sudden sunny after rain or changes in climate. When the leaf veins are yellowing, there is poor plant growth, this situation will not cause dead trees, mainly caused by high temperature, poor root growth, lack of fertilizer and water.

3. Prevention and control methods

The combination of physical control and chemical control can be adopted for bean root rot disease, combined with soil preparation, soil disinfection and sterilization to eliminate pathogens, and carbendazim can be used to irrigate the root when the disease occurs, and the effect is better. For those who lack trace elements, organic fertilizer can be applied as base fertilizer to improve the content of soil organic matter, improve soil results, supplement trace elements for plants, and supplement trace elements that plants lack through foliar spraying in the later stage. it can alleviate the yellowing of leaves. For the leaf vein yellowing, it is necessary to reasonably water and fertilize, enhance the resistance of the plant, make the root growth strong, so as to avoid the leaf vein yellowing and lead to the premature senescence of the leaf.

The above are the reasons for the yellowing of bean leaves and the introduction of prevention and control methods, hope to help you, want to know more related knowledge, please pay attention to us.