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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Annuals and Perennials > Petunia > Leaves wilt and turn brown

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Petunia > Leaves > Leaves wilt and turn brown

1 of 3
  • Black root rot 1
  • Black root rot 2
  • Black root rot 3

Black Root Rot
Thielaviopsis basicola

  • Leaves turn yellow and wilt; leaf veins may remain green
  • Plants are stunted
  • Dark sunken black lesions occur on roots
  • Stems below ground may develop black longitudinal cracks
  • More information on Black Root Rot
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  • White mold 1
  • White mold 2
  • White mold 3

White Mold
Sclerotinia sclerotiorum

  • Leaves on the entire plant or single branch wilt and turn brown
  • Stems turn tan to off-white where infected
  • Fluffy, white cotton-like fungal growth may been seen growing on the discolored stem when humidity is high
  • Small (1/16 to ½ inch), black, hard, round to irregular fungal resting structures can be found clinging to the outside an infected stem or embedded inside dead stems
  • More information on White Mold
3 of 3
  • Gray mold 1
  • Gray mold 2
  • Gray mold on flower 3

Gray Mold
Botrytis cinerea

  • Large brown spots or blotches on leaves
  • Leaves or entire plant may be completely blighted, brown, and wilted
  • Blossoms or petals may turn brown and 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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