rusty orange fuzzy fungus on mandevilla

Question

What is the rusty orange fuzzy fungus appearing on about two inches of the end of each stem on a Mandevilla? Is it a fungus or pollen? If it is fungus, how should I treat it? The plant is otherwise very healthy producing lots of shoots and flowers.

Answer 1

Likely you are describing Rust disease.

You can remove the diseased leaves and dispose of. Treat the plant with Neem Oil.
Here are links 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