Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Azalea/Rhododendron > Spots or blotches on leaves
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.
- Irregular gray to brown spots on leaves
- Dark brown to black blotches on green stems
- Leaf drop may occur and shoot tips die back
- More information on Phytopthora leaf spot and shoot blight
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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
