Hollyhock: Rust
Hollyhock: Rust Categories: Flowers Hollyhock Hollyhock Diseases Ornamentals Last review date: 2026-05-25 02:25 Hollyhock rust symptoms and sporulation Photo by: R.S. Byther Biology Hollyhock rust is caused by a fungus that overwinters in basal leaves which may live through the winter, or on plant debris. Spores remain viable for at least four months in the […]