This is the third year my Hollyhock has brown-yellow spots on leaves and stems and I can't get rid of them with Sevin. Planted four new ones about one to three feet away from the old one and they got this disease right away. I don't know what it is. Can anyone help me out? Thanks.
Certified GKH Gardening Expert
This is likely rust fungus. Here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm