Common Name(s):Tar Spot (Rhytisma acerinum) |
Common Name(s):
Scientific Name(s):
Rhytisma acerinumType:
FungusPrinciple Host Trees & Shrubs
:Sycamore and other Maples (Acer species).
Description, Development & Diagnosis:
The fungus overwinters on fallen leaves. Fresh spores are produced in Spring which have a sticky coating. The spores attach themselves to the new leaves as they form. A raised, shiny black spot appears on infected leaves.
Significance:
Common. Can cause premature leaf drop but the vigour of the tree is rarely affected. Rarer in cities due probably to fewer fallen leaves left under trees.
Control:
Generally unnecessary. If a problem on ornamental species dispose of fallen leaves in Autumn to reduce spore levels in Spring.
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