WSU Extension


Botrytis petal blight 
Cylindrocladium blight & root rot 
Leaf and flower gall 
Leaf spot 
Lime-induced chlorosis 
Marginal leaf necrosis 
Nematode (stunt) 
Ovulinia petal blight 
Powdery mildew 
Root rot (Phytophthora) 
Azalea bark scale 
Azalea lace bug 
Azalea leafminer 
Obliquebanded leafroller 
Root weevils 
Spider mites 

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Azalea : Nematode (stunt)
(revision date: 4/23/2014)

Nematode problems are most common in nursery plantings. Nematodes are tiny, worm-like parasites found only in the soil that feed on the roots. The root damage causes an overall stunting of affected plants, and plants may also show signs of drought stress or iron deficiency. Leaves can die back or drop prematurely, or entire plant tops may be yellowed. Nematode stunt symptoms often appear in a circular pattern. Soil samples must be taken to confirm nematode infestation.
Management Options

Non-Chemical Management
  • Plant only clean stock to avoid introducing nematodes.
  • Plant nematode-tolerant species or varieties.
  • Provide proper culture. Healthy plants are more tolerant of damage.
Select non-chemical management options as your first choice!

Chemical Management

None recommended


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