What disease is yellowing of grape leaves? What medicine is used and what causes it?

1. What medicine should be used for what disease?

Its yellow leaves are mostly caused by yellow leaf disease, which is a common disease. This disease will seriously affect its normal growth, and it must be treated with medication as soon as possible when discovered. In the early stage of the disease, you can spray ferrous sulfate solution, or mix it with citric acid solution, and spray it every 7-10 days. When spraying, choose a cloudy day to avoid strong sunlight, so that the effect will be better.

2. What causes it?

1. There is more rainy weather in autumn, which is prone to cause diseases such as white rot and frost. The diseases occur early and the damage is serious, and they are not easy to manage. In this case, the tree's nutrients will be consumed too much, and leaves will fall. The plants that overwinter have less nutrients and their physiological balance will be disturbed, which will easily cause yellow leaf disease when the new shoots enter the rapid growth period.

2. The soil in the cultivated area is too alkaline and the pH value is too high. In this case, the iron element will become insoluble iron and cannot be absorbed and utilized. In the long run, it will cause chlorosis symptoms.

3. There are many varieties of it, some of which have poor disease resistance and are easily infected by diseases, and the symptoms are more serious when they occur. Therefore, when cultivating, you must choose suitable varieties and those with strong disease resistance.