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 Botanic Garden >> Gardening >  >> Question and Answer >> Plant Diseases

Crape Myrtle Black Soot: Sooty Mold from Insects

Healthy crape myrtle turned black (ground too) after Sevin spray didn't help. Sooty mold on honeydew from aphids/scale.

Solution

  • Read UAEX FSA-7555: Sooty Mold
  • Control insects → mold weathers off.
  • Speed up: dilute soapy water spray, let sit, rinse.

Key

Sevin (carbaryl) kills insects but not mold. Mold persists until honeydew stops.

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