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Leaf blight, also called Isariopsis leaf spot (Pseudocercospora vitis) on Grape (Vitus sp.)


11 Images
5405315
Paul Bachi
University of Kentucky Research and Education Center

Scattered, somewhat angular, purple-brown spots on upper leaf surface.

5405316
Paul Bachi
University of Kentucky Research and Education Center

Corresponding, less conspicuous, brown spots on lower leaf surface.

5405317
Paul Bachi
University of Kentucky Research and Education Center

Numerous scattered, somewhat angular, purple-brown spots on upper leaf surface.

5405318
Paul Bachi
University of Kentucky Research and Education Center

Corresponding, less conspicuous, brown spots on lower leaf surface.

5405319
Paul Bachi
University of Kentucky Research and Education Center

Single spot with dark green-black "synnemata", clusters of conidiophores and conidia, coming up from infected tissue.

5405320
Paul Bachi
University of Kentucky Research and Education Center

View across single spot with dark green-black "synnemata", clusters of conidiophores and conidia, coming up from infected tissue.

5405321
Paul Bachi
University of Kentucky Research and Education Center

Close-up of dark green-black "synnemata", clusters of conidiophores and conidia, coming up from infected tissue.

5405322
Paul Bachi
University of Kentucky Research and Education Center

Synnemata with conidia of the asexual fungus, Pseudocercospora vitis.

5405323
Paul Bachi
University of Kentucky Research and Education Center

Synnema with conidia of the asexual fungus, Pseudocercospora vitis.

5405324
Paul Bachi
University of Kentucky Research and Education Center

Conidia beginning to form on a synnema of the asexual fungus, Pseudocercospora vitis.

5405325
Paul Bachi
University of Kentucky Research and Education Center

Conidia of the asexual fungus, Pseudocercospora vitis.