Speckled tar spot

Speckled tar spot - Stromata of <em>Rhytisma punctatum</em> on bigleaf maple
  • Latin name: Rhytisma punctatum (Pers.:Fr.) Fr.
  • French name: Tache goudronneuse ponctuée
  • Division: Ascomycota
  • Class: Rhytismatales
  • Synonym(s): Melasmia punctata Sacc. & Roum.





Damage, symptoms and biology

Stromata appear as "tar spots" on roughly circular areas of chlorotic leaf tissue.

The major impact of this disease is a reduction in the aesthetic value of ornamentals.

Other information

Raking up and destroying dead leaves in the fall will reduce the severity of the disease.

Canadian Forest Service Publications

Speckled tar spot

Information on host(s)

Main host(s)

Bigleaf maple, Manitoba maple, mountain maple, silver maple, striped maple

Secondary host(s)

Red maple, sugar maple

  • Speckled tar spot Stromata of Rhytisma punctatum on bigleaf maple
  • Speckled tar spot Tar spots of Rhytisma punctatum, the causal organism of speckled tar spot, on an infected maple leaf.
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