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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Annuals and Perennials > Impatiens > Blotches or spots on leaves

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Impatiens >Leaves > Blotches or spots on leaves

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  • Gray mold 1
  • Gray mold 2
  • Gray mold 3

Gray 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
  • Impatiens Necrotic Spot Virus 2
  • Impatiens Necrotic Spot Virus 3

Impatiens 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
  • Flower thrips
  • Flower thrip damage 3

Flower 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
  • Oedema 2
  • Oedema 3


  • 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
  • Sunscald 2
  • Sunscald 3


  • 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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