(Rhytisma salicinum)
Occurrence | Widespread and locally common |
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Season | Spring to fall |
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Habitat/Hosts | prairie willow (Salix humilis) Bebb’s willow (Salix bebbiana) (?) |
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Identification | This is a parasitic fungus infecting several species of willow (Salix). In Minnesota it infects prairie willow, pussy willow, and possibly Bebb’s willow and other willow species. It has not been recorded on crack willow or other willow tree species. In the spring the infection appears as a yellow spot on the leaf. These turn first brownish-black with a yellow border, then, in late summer, black with a yellow border. The black spots resemble tar. The spots are solid, not a cluster of small spots. They may be more than 1″ in diameter but are usually smaller, due at least in part to the narrow width of the leaves it infects. The fungus is intollerant of air pollution and is usually found in rural locations. |
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Similar Species |
Tar Spot (Rhytisma americanum) infects red maple and silver maple. |
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Distribution | |||||||
Comments | Two Scientific Names |
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Taxonomy | Division: |
Ascomycota (ascomycetes) |
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no rank: | saccharomyceta |
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Subdivision: |
Pezizomycotina |
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No Rank: |
leotiomyceta |
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sordariomyceta |
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Order: |
Rhytismatales |
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Family: |
Rhytismataceae |
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Synonyms | Melasmia acerina Xyloma leucocreas Xyloma salicinum |
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Common Names |
Sycamore Tarspot Tar Spot |
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