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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Azalea/Rhododendron > Spots or blotches on leaves

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Azalea/Rhododendron > Leaves > Spots or blotches on leaves

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Powdery mildew
Microsphaeria penicillata

  • White spots or blotches on leaves
  • In severe cases leaves and young shoots may be completely covered with white powdery fungal growth
  • Leaves may be stunted, curled or puckered
  • More information on powdery mildew
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Phytophthora leaf spot and shoot blight
Phytophthora spp.

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Four-lined plant bug
Poecilocapsus lineatus

  • Small, round depressed spots which may be brown, black or translucent on leaves
  • Dead plant tissue may fall out causing a "shot hole" effect
  • Newly hatched nymphs are red with black wing pads and become yellowish green with a black stripe on each wing pad as they develop
  • Adults are 1/2 inch long, yellowish to yellow green in color with four longitudinal black stripes on the wing covers
  • More information on four-lined plant bug

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