Every year around middle to late summer rust develops on the bushes. We had sprayed them in the latter part of the year, but it just turned them more brown. We are using a product called Microzeb (fungus killer). What should we use now to prevent this? What should we do in the latter months? When do we apply the product, and in which months?
Certified GKH Gardening Expert
I would recommend treating them with fungicide (neem oil is an effective fingicide) frequently at the beginning of the year, including the soil around the plants. Also, prune some of the interior branches out so that the plant has better air circulation.
This article will help you with preventing future rust problems: https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm