WSU Extension

Hortsense

Caption: Pyracantha scab on leaves
Photo by: R.S. Byther
  
print version| pdf version| email url    

Pyracantha : Scab
(revision date: 1/22/2016)


Biology
Pyracantha scab is caused by a fungus that overwinters in infected leaves, twigs, and berries. Young leaves and berries are most susceptible to infection. Olive green to black spots develop on leaves, twigs and fruit. Infected leaves may turn yellow or red and fall off prematurely.
Management Options

Non-Chemical Management
  • Pruning in dormant season to remove dead wood and foliage.
  • Plant resistant cultivars: for yellow berries, 'Shawnee' and 'Aurea'; for orange berries, 'Mohave', 'Orange Glow', or 'Teton'; for red berries, 'Watereri', 'Government Red', 'Navaho'.
  • Rake and destroy fallen leaves and fruit.
Select non-chemical management options as your first choice!

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • Bonide Copper Fungicide Spray or Dust RTU [Organic]
    Active ingredient: basic copper sulfate  |  EPA reg no: 4-58
  • GardenTech Daconil Fungicide Conc
    Active ingredient: chlorothalonil  |  EPA reg no: 67572-82-71004
  • Monterey Liqui-Cop Copper Fungicidal Garden Spray
    Active ingredient: copper-ammonia complex  |  EPA reg no: 54705-7
  • Ortho Max Garden Disease Control Conc
    Active ingredient: chlorothalonil  |  EPA reg no: 239-2522
  • Safer Brand Garden Fungicide/Flowers, Fruit & Vegetables Conc
    Active ingredient: sulfur  |  EPA reg no: 42697-37
  • Spectracide IMMUNOX Multi-Purpose Fungicide Spray Conc
    Active ingredient: myclobutanil  |  EPA reg no: 9688-123-8845
  • This list may not include all products registered for this use.
Images
    - hide images

+ Show larger images

 
Caption: Pyracantha scab on leaves
Photo by: R.S. Byther
Caption: Pyracantha scab
Photo by: R.S. Byther
Caption: Pyracantha scab flower infections
Photo by: R. Maleike
Caption: Pyracantha scab flower infections
Photo by: R. Maleike