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Cercospora leaf spot (Cercospora rosicola) on Rose, Knockout (Rosa x)


6 Images
5368335
Paul Bachi
University of Kentucky Research and Education Center

Potted shrub with leaf spots. Heavily infected leaves turn yellow and drop off readily. Knockout rose.

5368336
Paul Bachi
University of Kentucky Research and Education Center

Leaf spots with tan centers and darker brown borders. Knockout rose.

5368337
Paul Bachi
University of Kentucky Research and Education Center

Close-up of leaf spots. Spore-producing hyphae ("conidiophores") seen as dark, fuzzy clumps, in the center of the spot. Knockout rose.

5368338
Paul Bachi
University of Kentucky Research and Education Center

Infected leaf tissue seen under dark-field observation with spore-producing hyphae ("conidiophores") seen as dark brown clumps. Spores have been stained. Knockout rose.

5368339
Paul Bachi
University of Kentucky Research and Education Center

Dark-field observation of spore-producing hyphae ("conidiophores") seen as dark brown clumps. The several-celled spores have been stained. Knockout rose.

5368340
Paul Bachi
University of Kentucky Research and Education Center

Dark-field observation of spore-producing hyphae ("conidiophores") seen as dark brown clumps. The several-celled spores have been stained. Knockout rose.