WSU Extension

Hortsense

Common Cultural Problems
 
Air pollution 
Chlorosis 
Construction damage 
Desiccating wind 
Drought damage 
Fasciation 
Fertilizer burn 
Frost injury 
Hail damage 
Lime-induced chlorosis 
Marginal leaf necrosis 
Morphological changes 
Mosses and lichens 
Needle loss 
Needle tip necrosis 
Nutrient deficiency 
Oedema 
Overwatering or poor drainage 
Plant girdling and circling roots 
Poor pollination 
Salt damage 
Sunscald 
Transplant shock 
Winter desiccation 
Winter injury 



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Caption: Oedema on hosta
Photo by: R.S. Byther
  
Common Cultural : Oedema
(revision date: 4/30/2013)


Use Integrated Pest Management (IPM) for successful plant problem management.

Biology
Oedema usually appears first on the lower leaf surface as watery blisters. As they age they become brown, yellow, or rust-colored and may resemble disease symptoms. It is very common on geranium but also occurs on many types of plants, particularly those having fleshy leaves. High soil moisture, high humidity, and soil temperature warmer than air temperature favor symptom development.
Management Options

Non-Chemical Management
  • Do not overwater.
  • Keep greenhouse humidity low, by heating if necessary.
  • Maintain higher greenhouse temperature.
Select non-chemical management options as your first choice!

Chemical Management
IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides

None recommended

Images

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Caption: Oedema on hosta
Photo by: R.S. Byther
Caption: Oedema on geranium
Photo by: R.S. Byther
Caption: Oedema on geranium
Photo by: R.S. Byther
Caption: Oedema on camellia
Photo by: B.M. Johnson