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Sclortinia stem rot, White mold (Sclerotinia sclerotiorum) on Coneflower, sweet (Rudbeckia subtomentosa)


4 Images
5368815
Paul Bachi
University of Kentucky Research and Education Center

A dry, lower stem rot usually with disintegrated pith tissue.

5368816
Paul Bachi
University of Kentucky Research and Education Center

A dry, lower stem rot usually with disintegrated pith tissue.

5368817
Paul Bachi
University of Kentucky Research and Education Center

Note the hard, black survival structures called “sclerotia” in culture plates.  Isolated from sweet coneflower (Rudbeckia subtomentosa Pursh)

5368818
Paul Bachi
University of Kentucky Research and Education Center

Note the hard, black survival structures called “sclerotia” in culture plates.