wisteria had dusting of yellow on leaves

Question

My wisteria had a dusting of yellow on the leaves. Many of the established plants and new plants have this.

Answer 1

Yellow dusting could be pollen that has fallen from flowers. This would be normal and no issue to resolve.

Sometimes Rust fungus could be described as yellow so I'm giving you links with information on how to treat.

https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm