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Impatiens >Leaves > Blotches or spots on leaves

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  • Gray mold 1
    Credit: Michelle Grabowski, University of Minnesota Extension
  • Gray mold 2

    Credit: Michelle Grabowski, University of Minnesota Extension

  • Gray mold 3

    Credit: Michelle Grabowski, University of Minnesota Extension

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green arrowGray Mold
Botrytis cinerea

  • Brown spots on leaves with concentric brown rings like a bull’s eye
  • Brown blossoms or petals; flowers drop off prematurely
  • Gray fuzzy mold develops on rotted tissue under humid conditions
  • Disease develops during  cool, wet weather
  • More information on Gray Mold
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  • Impatiens Necrotic Spot Virus 1
    Credit: Robert Wick, University of Massachusetts, Bugwood.org
  • Impatiens Necrotic Spot Virus 2

    Credit: Jennifer Olson, Oklahoma State University, Bugwood.org

  • Impatiens Necrotic Spot Virus 3

    Credit: Jeffrey W. Lotz, Florida Department of Agriculture and Consumer Services, Bugwood.org

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green arrowImpatiens Necrotic Spot Virus (INSV)

  • Symptoms are extremely variable
  • Stunted growth and wilting may occur
  • Leaf distortion; ringspots or black spots on leaves and stems; blackish/purplish coloration along leaf veins
  • Tip dieback and in some cases entire plant will collapse
  • Lab test needed to identify INSV since it is difficult to diagnose on symptoms alone
  • More information on INSV
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  • Flower thrip damage 1
    Credit: Chazz Hesselein, Alabama Cooperative Extension System, Bugwood.org
  • Flower thrips

    Credit: Jack T. Reed, Mississippi State University, Bugwood.org

  • Flower thrip damage 3

    Credit: David Cappaert, Michigan State University, Bugwood.org

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green arrowFlower Thrips
Frankinella spp.

  • Active from June through September
  • Feeding damage causes petals and leaves to have a stippled or silvery appearance
  • Flowers turn black and prematurely fall off
  • Tiny, black excrement can be seen inside damaged flower buds or on the underside of leaves
  • Adults are 1/16 inch long, elongate, and range from yellow to brown. Nymphs are yellow
  • More information on Flower Thrips
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  • Oedema 1
    Credit: Joseph LaForest, University of Georgia, Bugwood.org
  • Oedema 2

    Credit: Need to get permission from Tina Smith University of Mass

  • Oedema 3

    Credit:Need to get permission from Tina Smith University of Mass

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green arrowOedema

  • Pale-green to white blisters or bumps on the undersides of leaves
  • Blisters  brown with age and have a crusty or corky appearance
  • Older leaves are more affected then younger ones
  • Occurs when plants are overwatered during cool or humid weather
  • More information on Oedema
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  • Sunscald 1
    Credit: Michelle Grabowski, University of Minnesota Extension
  • Sunscald 2

    Credit: Michelle Grabowski, University of Minnesota Extension

  • Sunscald 3

    Credit: Michelle Grabowski, University of Minnesota Extension

  • - CLICK PHOTOS TO ENLARGE -

green arrowSunscald

  • Exposed parts of leaves bleach yellow to white
  • In severe cases, affected areas turn brown and brittle
  • Symptoms more severe in dry hot weather
  • More information on Sunscald

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