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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Annuals and Perennials > Roses > Spots on flowers

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Roses > Flowers > Spots on flowers

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  • Image: Gray Mold 1
  • Image: Gray Mold 2
  • Image: Gray Mold 3

Gray Mold
Botrytis cinerea

  • Small red rings or flecks on white or light colored petals
  • Brown irregular spots on petals
  • Completely brown, curled over, dead flower buds
  • Brown sunken area on stem
  • Gray fuzzy spores produced in cool wet weather
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  • Image: Thrips 1
  • Image: Thrips 2


  • Active throughout summer
  • Causes brown streaks, esp. in light colored blossoms
  • Heavily infested buds may not open
  • Very small

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