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

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Roses > Leaves > Spots on leaves

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  • Image: Black Spot 1
  • Image: Black Spot 2
  • Image: Black Spot 3

Black Spot
Diplocarpon roseae

  • Purplish black spots with uneven or feathery edges on leaves
  • Leaves turn yellow around spots
  • Leaves fall off
  • Sometimes reddish purple or black blisters on canes
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  • Image: Leaf Spot (Anthracnose) 1
  • Image: Leaf Spot (Anthracnose) 2
  • Image: Leaf Spot (Anthracnose) 3

Leaf Spot (Anthracnose)
Sphaceloma rosarum, Alternaria alternata, Cercospora sp.,
Colletotrichum capsici

  • Small circular leaf spots with a red or purple border and light gray or white center
  • In severe infections spots grow together to cover large areas of leaf
  • Leaves turn yellow or brown, dry out and fall off
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  • Image: Powdery Mildew 1
  • Image: Powdery Mildew 2
  • Image: Powdery Mildew 3

Powdery Mildew
Sphaerotheca pannosa

  • Powdery white coating on leaves, stems, flower buds and flower stalks
  • Leaf tissue may be tinted red around the infection
  • Leaves can be twisted or curved at the site of infection
  • Infection often most severe on young leaves
  • Typically occurs mid to late summer
  • More information on powdery mildew
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  • Image: Rust 1
  • Image: Rust 2
  • Image: Rust 3

Phragmidium mucronatum

  • Orange raised bumps on underside of leaves
  • Twisted or bent leaves, with orange lesions
  • Powdery orange spores released from all lesions and spots
  • Severely infected leaves may wilt
  • More information on rust
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  • Image: Downy Mildew 1
  • Image: Downy Mildew 2

Downy Mildew
Peronospera sparsa

  • Purplish red spots or blotches on leaves, spots often will not grow past major leaf veins
  • Reddish black spots on canes, petioles and other plant parts
  • Grey fuzz on underside of leaf when high humidity
  • Leaves turn yellow and fall off plant
  • Common in cool wet weather
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  • Image: Virus 1
  • Image: Virus 2
  • Image: Virus 3

Rose Mosaic Virus

  • Unusual yellow wavy lines, circles, spots or mottling on leaves
  • Symptoms are most obvious in cool weather in spring and fall, may become faint in the heat of summer
  • Leaves can be leathery, wrinkled or distorted
  • Plants can be stunted or grow poorly

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