WSU Extension


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Pieris (Andromeda) : Leaf spot
(revision date: 5/19/2015)

Leaf spot of andromeda is a fungal disease causing necrotic (dead) spots on the leaves. Spots are circular or angular in outline, and typically are red to brown, sometimes with silvery-gray centers. Fruiting structures of the fungus may occasionally be seen as small black dots on the silvery portion of the spots.
Management Options

Non-Chemical Management
  • Provide proper cultural care for plants, including proper fertilization and irrigation. A healthy plant is more resistant to disease.
  • Clean up and destroy fallen diseased leaves to prevent spread of fungus.
  • Prune out and destroy affected leaves when practical.
  • Avoid overhead irrigation, or limit it to times when foliage can dry quickly.
Select non-chemical management options as your first choice!

Chemical Management

Apply at first appearance of disease.

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
  • Bonide Fung-onil Multi-Purpose Fungicide Conc
    Active ingredient: chlorothalonil  |  EPA reg no: 60063-9-4
  • Bonide Liquid Copper Fungicide Conc/Organic Gardening
    Active ingredient: copper octanoate  |  EPA reg no: 67702-2-4
  • GardenTech Daconil Fungicide Conc
    Active ingredient: chlorothalonil  |  EPA reg no: 67572-82-71004
  • Ortho Max Garden Disease Control Conc
    Active ingredient: chlorothalonil  |  EPA reg no: 239-2522
  • This list may not include all products registered for this use.
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