Q: Old azaleas develop white spots on flowers in late spring. What is it?
A: Ovulina petal blight—severe in warm, moist conditions. Affected flowers turn brown and cling longer. Fallen flowers carry spores that survive up to two years in soil, reinfecting next spring if conditions are right. See links for recommended fungicides.
Petal Blight on Azalea
Ovulina Petal Blight
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Shamrock (Oxalis) White Spots: Light, Water, and Water Quality
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