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Leaf/twig blight (Blumeriella kerriae) on Kerria, Japanese (Kerria japonica)


4 Images
5368779
Paul Bachi
University of Kentucky Research and Education Center

Leaf infection shows reddish spots with dark borders and, if numerous, leaves yellow and fall. Stem cankers are produced as discolored more or less extended darkened areas which may crack open.

5368780
Paul Bachi
University of Kentucky Research and Education Center

Close-up of a spot with a ring of raised, spore-producing bodies ("acervuli") within spot.

5368781
Paul Bachi
University of Kentucky Research and Education Center

Spore-producing bodies ("acervuli") and spores under dark-field observation.

5368782
Paul Bachi
University of Kentucky Research and Education Center

Spores of the anamorph fungus Phloeosporella.