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

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Roses > Leaves >Misshapen leaves

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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
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  • Image: Rust 1
  • Image: Rust 2
  • Image: Rust 3

Rust
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
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  • Image: Herbicide damage 1
  • Image: Herbicide damage 2

Herbicide damage

  • Leaves are small narrow and may be twisted
  • In spring, leaves emerge in tight clumps and remain small and thin
  • Affected leaves eventually turn yellow and die
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  • Image: Virus 1
  • Image: Virus 2
  • Image: Virus 3

Virus
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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