First of all, the first reason may be that the rich trees have been overexposed for a long time. Generally speaking, the leaves mentioned just now are not suitable for long-term exposure. Once the rich tree is exposed to the sun for a long time, its leaves may be sunburned by the sun, and then spots may appear. And these spots will get bigger and bigger with the extension of irradiation time. The solution to this situation can be to cut off some leaves with white spots and let the rich trees grow new leaves again, because even if these leaves are not cut off, they will not return to their original state. At the same time, we should also pay attention to further reducing the sunshine time of the rich trees.
The second reason may be caused by improper watering of the rich trees. Water the rich trees in moderation. You know, once watered too much, the root system of the rich tree is very likely to be damaged, and then the tip will gradually turn brown. As the roots are eroded by excessive watering, the whole leaves of the rich tree will dry up and turn white. On the contrary, if you don't water the rich tree for a long time, it will also cause the roots of the rich tree to be damaged by drought, and then the leaves will be dry and white. The solution is to find out whether the leaves turn white because of too much water or too little water, and then prescribe the right medicine.
The third reason may be that the rich tree has some diseases for various reasons. For the rich trees, there is a disease called leaf spot, which is characterized by many irregular brown or white spots on the leaves. In view of this situation, the countermeasures are to cut off these diseased leaves first, and then use some corresponding chemical sprays to gradually eliminate the diseases.