What is the cause of the yellowing of fruit tree leaves?

The growth of fruit trees affects the yield and quality of fruit, and yellowing of leaves occurs from time to time in the process of planting. What is the reason for this? Is there any remedy?

What is the reason why the leaves of fruit trees turn yellow?

1. Disease

The occurrence of yellow leaves in fruit trees is likely to be caused by mosaic virus. Mosaic virus disease comes from the rootstock or scion of fruit trees. it may not be obvious in that year, but it gradually appears with the change of temperature and the strength of the tree.

two。 Too high or too low temperature

If the temperature is too high or too low, the leaves of fruit trees will turn yellow. When the temperature continues to be too high, the stomata of the leaves become larger and yellowed due to loss of water. The temperature continued to be too low, the stomata of the leaves closed and yellowed due to the shutdown.

3. Drug damage

When spraying on fruit trees, if the concentration of the solution is too high, it is easy to burn out the leaves and cause the leaves to turn yellow.

What if the leaves of fruit trees turn yellow?

1. The tree should be fed early in autumn, and the corresponding amount of organic fertilizer and trace elements should be put in to increase the nutritional reserve of the tree. Spraying brassinolide twice during the period from leaf spreading to bagging can also reduce the probability of mosaic disease, mainly by increasing the resistance of the tree and the ability of anti-virus, and this symptom will naturally be alleviated.

two。 When the temperature is too high or too low, we should pay attention to the prevention and control measures; if it is too high, we should carry out irrigation to replenish water in time; if the temperature is too low, we should pay attention to water control and take good measures to prevent cold and keep warm.

3. When spraying chemicals to fruit trees, choose low-toxic, green chemicals and use them in strict accordance with the instructions.

In addition, when there is a lack of elements such as phosphorus, potassium and magnesium, it will also cause leaves to turn yellow, so fertilizer should be applied according to the situation.