Clemson University - USDA Cooperative Extension Slide Series , Bugwood.org
black rot (Guignardia bidwellii) symptoms on grape (Vitis spp.)
M. Clerjeau, INRA, Centre de Recherches de Bordeaux, Bugwood.org
Damage on grapevine shoots: long brown-bordered cankers, more or less sunken, generally carrying fruiting bodies.
University of Georgia Plant Pathology , University of Georgia, Bugwood.org
black rot
M. Clerjeau, INRA, Centre de Recherches de Bordeaux, Bugwood.org
Symptomson a grapevine leaf: necrotic circular lesions scattered over lamina.
M. Clerjeau, INRA, Centre de Recherches de Bordeaux, Bugwood.org
Detail of grapevine berries infected by Guignardia bidwellii: browning, bluing and desiccation of berries; presence of numerous black dots (pycnidia or young perithecia).
Clemson University - USDA Cooperative Extension Slide Series , Bugwood.org
on stem
University of Georgia Plant Pathology , University of Georgia, Bugwood.org
Black rot
University of Georgia Plant Pathology , University of Georgia, Bugwood.org
black rot on grape
Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services, Bugwood.org
black rot (Guignardia bidwellii) symptoms on wine grape (Vitis vinifera)
Bruce Watt, University of Maine, Bugwood.org
Pycnidia evident in leaf spot
Bruce Watt, University of Maine, Bugwood.org
Pycnidia evident in leaf spot
Bruce Watt, University of Maine, Bugwood.org
Cross-section of pycnidium in plant tissue