What kind of medicine should grape leaves turn yellow?

Grape is one of the oldest fruit tree species in the world, which is cultivated all over the world. So, in the process of cultivation, what kind of medicine are the grape leaves yellowing?

What kind of medicine should the grape leaves turn yellow?

1. Lack of nutrients: regular spraying of foliar fertilizer and topdressing of compound fertilizer

2. caused by diseases: special fungicides can be sprayed, which can kill fungi, bacteria and other diseases, and can promote the rapid recovery of yellowed grape leaves.

3, caused by drug injury and fertilizer damage: spray clear water to the leaves and irrigate the roots to dilute the fertilizer on the grape leaves and reduce the damage.

Second, the reason why the grape leaves turn yellow.

1. Leaf yellowing caused by lack of elements in grapevines.

The absorption of various elements is different in each growth cycle, and the corresponding symptoms will be shown in the leaves when there is a lack of certain elements. A large number of field observations showed that the etiolation of grape caused by element deficiency was mainly related to the loss of iron, potassium, magnesium, boron and other elements.

The main results are as follows: (1) Iron deficiency: it is mainly on the tender shoot leaves, and the old leaves are basically normal. The veins of iron-deficient leaves remained green and yellowed between veins.

(2) magnesium deficiency: yellowing is mainly manifested in the old leaves, which is common in the middle and lower leaves, and chlorotic maculae occur between the leaf edges and veins.

(3) potassium deficiency: generally yellowing and dying from the leaf edge, the leaf curls up or down, and the leaf surface is distorted or uneven.

(4) Boron deficiency: generally speaking, there were water-immersed light yellow spots in young leaves, gradual chlorosis of leaf margin and veins, shrinkage and deformity of new leaves, and yellow-white or even scorched leaf margin in the later stage.

2. Etiolation caused by drug damage: the spraying may be affected by the weather, the mode of application and the quality of the agent. After the occurrence of drug damage to grapes, the leaves are often yellowed, which is usually shown about 4 days after pesticide application.

3. Etiolation caused by fertilizer damage: fertilizer damage will damage the root system of grape and yellowing leaves.

4. Yellowing caused by diseases: many infectious diseases of grape can cause leaf yellowing, which is easier to identify than physiological yellowing.

There are many reasons for the yellowing of grape leaves, and it is necessary to find out the causes before taking corresponding treatment measures.