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Potentilla > Leaves > Spots or blotches on leaves

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  • Image: 1
    Credit: M. Grabowski, University of Minnesota
  • Image: 2

    Credit: M. Grabowski, University of Minnesota

  • Image: 2

    Credit: M. Grabowski, University of Minnesota

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green arrowPowdery 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...
2 of 3
  • Image: 1
    Credit: M. Grabowski, University of Minnesota
  • Image: 2

    Credit: M. Grabowski, University of Minnesota

  • Image: 2

    Credit: M. Grabowski, University of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowRust
Phragmidium spp.

  • Bright orange raised spots on underside of leaves
  • Abundant powdery orange spores may be present
  • Leaves turn yellow, curl and drop
  • More information on rust...
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  • Image: 1
    Credit: Department of Plant Pathology Archive, North Carolina State University, Bugwood.org
  • Image: 2

    Credit: Department of Plant Pathology Archive, North Carolina State University, Bugwood.org

  • Image: 2

    Credit: M. Grabowski, University of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowDowny mildew
Peronospora potentillae

  • Light green angular spots appear on upper leaf surfaces and shoots; later turn coppery or brown
  • White or gray tufts appear on underside of leaves; may be dense in humid weather
  • Infected shoots may lose leaves and die
  • More information on downy mildew...

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