What's wrong with my plant? Give us your feedback

Cotoneaster > Stems/branches > Rough or bumpy areas on bark

1 of 2
  • Image: Black Rot 1
    Credit: Wayne Seidel, University of Minnesota
  • Image: Black Rot 2

    Credit: USDA Forest Service–Region 2–Rocky Mountain Region Archive, USDA Forest Service, Bugwood.org

  • Image: Black Rot 3

    Credit: Wayne Seidel, University of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowOystershell scale
Lepidosaphes ulmi

  • Light to moderate infestations show little or no symptoms
  • Severe infestations can cause chlorotic, stunted foliage
  • Dieback and cracked bark can result from heavy infestations
  • Light to dark brown, elongated, 1/10 to 1/8 inch long oyster-shell shaped scales found on bark
  • More information on Oystershell scale...
2 of 2
  • Image: 1
    Credit: Michelle Grabowski, University of Minnesota
  • Image: 2

    Credit: Joseph O'Brien, USDA Forest Service, Bugwood.org

  • Image: 3

    Credit: John Hartman, University of Kentucky, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowNectria canker
Nectria cinnabarina

  • Dead branches and twigs, often first observed in early spring
  • Bark at the base of dead branches is slightly sunken, discolored or cracked
  • Tiny, pink, pale orange or cream colored cushion-like spore-producing bodies are visible in cracks in bark in spring
  • In summer, smaller coral colored bumps push through cracks
  • In autumn these spore-producing structures are dark brown or black
  • More information on Nectria canker...

Don't see what you're looking for?