What is the reason why the leaves of rhododendron turn yellow and dry?

Rhododendron leaves turn yellow and dry for three reasons. First, the light is too strong, it likes the astigmatism environment, but it is afraid of strong light. If exposed to strong light in summer, it will get sunburned and its leaves will turn yellow and dry. Second, too much watering makes the soil water roots perishable. Rotten root plants can't provide water, and the leaves will turn yellow and dry. The third is infected with pests and diseases. If it is not properly managed, it will be infected with pests and diseases and the leaves will turn yellow.