What are the symptoms of powdery mildew of Lagerstroemia indica?

Powdery mildew of Lagerstroemia indica mainly harms leaves. Young leaves are more susceptible to infection than old leaves, and will also infect tender buds and buds. After infection, small white speckles appear at first, and after expansion, they are round or irregular faded spots covered with white speckles, and young leaves are prone to distortion and shrinkage, withering and falling early. If the tender buds and buds are infected, the new buds will be deformed, the buds will not open, and the seriously infected petals will wither and fall off early.