WSU Extension

Hortsense

Hypericum
 
Disease
Rust 



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Caption: Hypericum rust: upper leaf surface
Photo by: R.S. Byther
  
Hypericum : Rust
(revision date: 4/23/2014)


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 spores are produced from fruiting bodies on the lower leaf surface. Later, in fall and early winter, tissue on the lower leaf surface becomes necrotic where infected, though orange sporulation may still be observed.
Management Options


Non-Chemical Management
  • Remove infected leaves and leaf litter in the planting site. This may require mowing severely infected plantings, raking all leaves, and destroying infected leaf litter.
  • Avoid overhead watering in the evening.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Hypericum rust: upper leaf surface
Photo by: R.S. Byther
Caption: Hypericum rust
Photo by: R.S. Byther