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Black spot (Stegophora ulmea) on Elm (Ulmus sp.)


4 Images
5368937
Paul Bachi
University of Kentucky Research and Education Center

Leaves with small, raised black spots with a fine area of white tissue surrounding them, found mostly between the major veins.

5368938
Paul Bachi
University of Kentucky Research and Education Center

Close-up of infected spots with blister-like, brown spore-producing bodies ("acervuli") within the spots.

5368939
Paul Bachi
University of Kentucky Research and Education Center

Close-up of infected spots with blister-like, brown spore-producing bodies ("acervuli") within the spots.

5368940
Paul Bachi
University of Kentucky Research and Education Center

Close-up of one infected spot with blister-like, brown spore-producing bodies ("acervuli") seen under dark-field observation.