? How did this tree suddenly lose its yellow leaves?

At this time, the leaves of banyan trees turn yellow and fall, which is probably caused by long-term insufficient light, improper watering, excessive fertilization and the harm of red spider.

Banyan is a positive plant. It should be given enough light and shade tolerance all year round, but it can only be viewed for a short time. Long-term exposure to semi-shade or shady environment is easy to shed leaves.

Watering should be based on the wet and dry state of basin soil and temperature factors. When the temperature is higher than 25℃, the topsoil should be kept moist or fully watered when it is slightly dry. If the temperature is lower than 25℃, the surface of the basin soil must be dried and watered thoroughly before watering, and it should not be "half water".

Fertilization should be applied thinly and in the growing period. If the temperature is lower than 15℃, try not to apply fertilizer.

Under the condition of poor ventilation and dry air, it is extremely harmful to tetranychus urticae. When the density of insect population is low, it harms the back of leaves, and when the density is high, both sides of leaves can be seen. The control methods are: spraying water for many times, and spraying special insecticides, such as nisolone, dicofol and pyridaben.