1、 There are several

It has only one kind of yellow leaf disease, which is also a common disease. In the early stage of the disease, the tender leaves will turn yellow. With the development of the disease, most of the leaves will turn yellow or yellow white in the later stage. In severe cases, the growth of the whole plant will be affected. The fruit grain will stop growing and begin to fall off

2、 Cause of disease

There are three main causes of infection. First, because of the variety problem, some varieties have poor disease resistance and are easy to catch diseases. For example, Jufeng grape is more serious when it comes to disease. Second, the reason for the climate. There is more rain in autumn, which is easy to cause white rot or downy mildew. At this time, the nutrition consumption of the tree is too much, and the leaves will fall in the early stage. When overwintering, the tree is weak, and there will be physiological imbalance. When sprouting and growing leaves in spring, it is easy to be infected with this disease. Third, because the soil is too alkaline, the iron contained in it will become insoluble iron and cannot be absorbed, so it will slowly turn yellow

3、 Treatment method

Infection with this disease will seriously affect the later growth and bear fruit. When you find it, you should use medicine for treatment as soon as possible. You can spray ferrous sulfate solution every 7-10 days, so that it can be effective two or three times. In addition, pay attention to prevention. At ordinary times, the soil should pay attention to acid regulation and maintain normal pH. Every winter, the garden should be cleared and the diseased leaves and dead branches should be disposed of to avoid infection