brown covering on my crepe myrtle leaves

Question

What is causing brown covering on my crepe myrtle leaves? When I was looking at my trees the other day, I noticed a layer of brown on the top of the leaves. You can lightly rub it and it comes right off in flakes. Do I need to hose it down?

Answer 1

This sounds like Rust Fungus.

Here is a link with more information.

https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm