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

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Ribes > Leaves > Spots or blotches on leaves

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White Pine Blister Rust
Cronartium ribicola

  • Light yellow angular leaf spots on upper leaf surface
  • Hair like orange spore producing structures on lower leaf surfaces
  • Powdery orange spores may be present
  • In highly susceptible varieties infected leaves may drop
  • More information on White Pine Blister Rust...
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Cluster Cup Rust
Puccinia caricina

  • Yellow spots on leaves and developing fruit in spring
  • Clusters of tiny orange cups form under leaf spots and on infected fruit or petioles
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Mycosphaerella leaf spot
Mycosphaerella ribis (Septoria ribis)

  • Small, irregular brown spots with gray centers on leaves
  • Leaves turn yellow, brown and then drop prematurely
  • Symptoms often occur on bottom of plant first
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Powdery mildew
Phyllactina guttata

  • White, powdery spots or blotches on leaves
  • Leaves and stems may be completely covered with white, powdery fungal growth
  • Leaves may yellow and drop prematurely
  • Young leaves and shoots may be curled and twisted
  • Entire shrub may appear gray or discolored
  • More information on powdery mildew...

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