Hollyhock

Hollyhock: Rust

Hollyhock: Rust categories: Flowers Hollyhock Hollyhock Diseases Ornamentals revision date: 2023-02-09 12:00 Hollyhock rust symptoms and sporulationPhoto 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 soil. Reddish, […]