Powdery Mildew on Cherry
I got a Dwarf North Star Cherry in the spring and planted it up in a huge container. It has been growing nicely all year and even gave me two cherries, but in the last month the tree has been attacked by powdery mildew. Along with the mildew many if the leaves are now speckled with white/yellow dots.
I tried to remedy the situation myself. Three weeks ago I bought Safer Brand Garden Fungicide, but after applying once a week and subsequently finishing the bottle there has been no improvement. Some leaves now are browning on the edges and curling downward.
Any identification and advice will be greatly appreciated. Pics are attached.