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Black spot (Diplocarpon rosae) on Rose, yellow tea (Rosa x odorata)


6 Images
5368960
Paul Bachi
University of Kentucky Research and Education Center

Leaves with feathery purple/black spots having no definite margin.

5368961
Paul Bachi
University of Kentucky Research and Education Center

Close-up of infected area on underside of leaf with slightly raised, dark brown, spore-producing bodies ("acervuli").

5368962
Paul Bachi
University of Kentucky Research and Education Center

Closer view of infected area on underside of leaf with slightly raised, dark brown, spore-producing bodies ("acervuli").

5368963
Paul Bachi
University of Kentucky Research and Education Center

Dark-field observation showing several brown, spore-producing bodies ("acervuli").

5368964
Paul Bachi
University of Kentucky Research and Education Center

Closer dark-field observation showing several brown, spore-producing bodies ("acervuli") with spores.

5368965
Paul Bachi
University of Kentucky Research and Education Center

two-celled spores of the anamorph fungus Marssonina rosae.