Hypericum: Rust
Hypericum: Rust categories: Hypericum Hypericum Diseases Ornamentals Shrubs revision date: 2022-12-03 12:00 Hypericum rust: upper leaf surfacePhoto by: R.S. Byther Biology Hypericum rust in Washington is caused by a rust fungus that does not have an alternate host. Yellow, red, or brown spots are observed on leaf surfaces. In spring and early summer, powdery orange […]