About a few diseases and troubles.

About a few diseases and troubles.

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It is rare to see these small white round spots because usually they are on the underside of yearly leaves and moreover they appear only on certain cultivars.
That is the signature of a fungus which is responsible for a disease called powdery mildew.
On the other hand this white powder can cover the whole surface of the leaves of deciduous azaleas at the end of the summer.