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    Symptoms (4)
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Image Subject Name Scientific Name Description
0176033 black rot Guignardia bidwellii Section through pycnidium in a mummified grapevine berry (diameter 80-100 µm) containing numerous conidia, in summer.
0176030 black rot Guignardia bidwellii Symptoms on grapevine bunches: mummification of infected berries.
0176031 black rot Guignardia bidwellii Detail of grapevine berries infected by Guignardia bidwellii: browning, bluing and desiccation of berries; presence of numerous black dots (pycnidia or young perithecia).
0176028 black rot Guignardia bidwellii Symptomson a grapevine leaf: necrotic circular lesions scattered over lamina.
0176034 black rot Guignardia bidwellii Section through young undifferentiated perithecia in a mummified grapevine berry, in autumn or winter (diameter 80-100 µm).
0176032 black rot Guignardia bidwellii Damage on grapevine shoots: long brown-bordered cankers, more or less sunken, generally carrying fruiting bodies.
0176036 black rot Guignardia bidwellii Pure culture of Guignardia bidwellii on malt agar medium, after 18 d incubation at 20°C, with pycnidia grouped in masses of black sclerotia.
0176035 black rot Guignardia bidwellii Section through perithecium in a mummified grapevine berry in spring (diameter 80-100 µm), containing numerous asci.
0176029 black rot Guignardia bidwellii Detail of leaf lesions on grapevine: note dark border and numerous black dots (pycnidia).

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