What's wrong with my magnolia?

[vette-kid]

The leaves started curling with silvery spots. Eventually turn black and fall off. No recent changes in watering or anything.

 

[Chuck]

The leaves started curling with silvery spots. Eventually turn black and fall off. No recent changes in watering or anything.View attachment 43602 View attachment 43603 View attachment 43604 View attachment 43602 View attachment 43603 View attachment 43604

Powdery mildew
https://www.thoughtco.com/powdery-mildew-tree-disease-1342873

 

[Esther Knapicius]

That's a magnolia. wow, never seen one look so bushy. must be the type for your area that we can't grow here.

 

[DirtMechanic]

I like the potassium bicarbonate idea. This article talks magnolia and powdery mildew specifically.