WSU Extension

Hortsense

Pieris (Andromeda)
 
Disease
Leaf spot 
Ramorum leaf and shoot blight (Sudden oak death) 
Root rot & dieback 
Insect
Black vine weevil 



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Caption: Pieris root rot and dieback
Photo by: J.W. Pscheidt
  
Pieris (Andromeda) : Root rot & dieback
(revision date: 4/23/2014)


Biology
Root rot and dieback of andromeda is caused by Phytophthora, a fungus which affects many ornamentals. Typically, plants appear unhealthy, with wilted or discolored leaves that may be stunted or drop prematurely. The fungus attacks the roots and progresses to the crown, eventually killing the plant. It is most frequently a problem in waterlogged or poorly drained soils. This disease can be spread by water movement or by root contact between diseased and healthy plants.
Management Options


Non-Chemical Management
  • Plant only disease-free materials.
  • Do not plant in waterlogged, poorly drained, or frequently flooded areas.
  • Improve soil drainage by incorporating organic matter or by using raised beds.
  • Do not overwater.
  • Avoid soil compaction, which can reduce drainage. Construction, heavy foot traffic, or machinery can compact soil.
  • Remove and destroy infected plants and plant parts.
  • Plant resistant species or varieties where Phytophthora root rot has been a problem. Your county Extension agent or WSU Master Gardeners can make recommendations.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Pieris root rot and dieback
Photo by: J.W. Pscheidt