WSU Extension

Hortsense

Broccoli, Cole crops
 
Disease
Black rot 
Clubroot 
Downy mildew 
Oedema 
Insect
Aphids 
Cabbage maggot 
Flea beetles 
Imported cabbageworm 
Loopers 
Thrips 



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Caption: Oedema on geranium
Photo by: R.S. Byther
  
Broccoli, Cole crops : Oedema
(revision date: 6/2/2014)


Biology
Oedema is a physiological problem. Symptoms are usually seen on the lower side of leaves, but may occur on any part of the plant. Watery blisters or gall-like structures form, and later turn dark brown or yellow. They may become somewhat corky in appearance. The later stages may resemble rust diseases. Oedema often occurs when soil temperatures are higher than air temperatures and soil moisture and relative humidity are high. Mechanical injury to leaves, such as that caused by insect feeding, windblown soil, or chemical injury, may also result in oedema.
Management Options


Non-Chemical Management
  • Control insects (especially aphids) which feed on leaves.
  • Provide proper culture, taking particular care to avoid overwatering.
  • Protect young plants from windblown soil by sprinkling during high winds.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Oedema on geranium
Photo by: R.S. Byther