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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