Orange Spots in Blackberry Leaves

Question

We have a blackberry bush that has orange pollen-like spots on the leaves. They are only on leaves that do not have any flowers. Is this a pest? What should I do about it?

Answer 1

It is most likely plant rust. This article will help:
https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm