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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Annuals and Perennials > Impatiens > Stunted plant

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Impatiens > Whole plant > Stunted plant

1 of 3
  • Root rot plant 1
  • Root rot close up 2
  • Root rot plant 3

Root Rot
Pythium spp., Rhizoctonia solani

  • Leaves turn yellow and wilt
  • Plants are stunted
  • With Rhizoctonia sp., the base of the stem may turn brown and crack
  • Roots have brown sunken areas and lack root hairs
  • The outer root tissue is easily removed leaving behind thin, stringy root cores.
  • Disease favors cool, wet soil with poor drainage
  • Lab test necessary to distinguish between Rhizoctonia and Pythium Root Rot
  • More information on Rhizoctonia root rot
  • More information on Pythium root rot
2 of 3
  • 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
3 of 3
  • Downy mildew 1
  • Downy mildew leaf 2
  • Downy mildew leaf 3

Downy Mildew
Plasmopara obducens

  • Leaves turn pale green to yellow and may curl slightly downward downy  white to fungal growth on underside of leaves
  • Plants become yellow in color and stunted
  • Infected leaves prematurely drop from the plant leaving a barren stalk with few leaves
  • Disease favors cool, wet weather
  • More information on Downy Mildew

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