Final diagnosis


Guignardia bidwellii (Black rot)

Small circular to polygonal partially cover this fig leaf. Light brown in color, they are bordered by a dark brown border. <b> <i> Guignardia bidwellii </i> </b> (black rot)
<i>Guignardia bidwelli</i> 45
Light brown necrotic lesions edged with dark coloration on leaves indicate attack by <i> Guignardia bidwelli </i>. (<b> Black rot </b>).
More or less extensive necrotic spots come together and invade these vine leaves, eventually leading to their death. <i> <b> Guignardia bidwelli </b> i </i> (black rot)
Necrotic spots of various sizes invade these vine leaves, eventually leading to their death. <i> Guignardia bidwellii </i> (<b> black rot </b>)
Pycnidia are clearly visible on these two spots. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
Pycnidia are clearly visible on this spot present on a vine leaf. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
Pycnidia of the imperfect form of <b> <i> Guignardia bidwellii </i> </b> dot the necrotic lesions on this leaf.
Early black rot lesions on twig. They have a brown to black tint and gradually become necrotic. <i> <b> Guignardia bidwellii </b> </i>
This tendril affected by <b> <i> Guignardia bidwellii </i> </b> presents a brown lesion on which pycnidia have developed.
Brown canker lesion dotted with pycnidia. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
Detail of a black rot lesion on a twig. It is covered with fruiting bodies of the fungus. <i> <b> Guignardia bidwellii </b> </i>
Still not very evolved attack of black rot on bunch of grapes. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
A well-developed attack of black rot on a bunch of grapes. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
Many berries are now more or less colonized by <i> <b> Guignardia Bidwellii </b> </i>. (black rot)
Grape berries with different levels of black rot attack; some begin to shrivel and become covered with pycnidia. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
Beginning of attack on grape berry. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
The fully weathered berry begins to shrivel and become covered with pycnidia. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
Grape berries with different levels of black rot attack. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
Pycnidia are clearly visible on this lesion on a grape berry starting to shrivel. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
The fully weathered berry begins to shrivel and becomes covered with pycnidia. <i> <b> Guignardia bidwellii </b> </i> (Black rot)
Young pycnidia being formed on a grape berry. <b> <i> Guignardia bidwelli </i> </b> (black rot)
Numerous black pycnidia dotting a grape berry. <b> <i> Guignardia bidwelli </i> </b> (black rot)
Most of the berries in this cluster are now shriveled and mummified; they also have a rather characteristic blackish color. <i> <b> Guignardia bidwellii </b> </i> (black rot)
The perithecia of <b> <i> Guignardia bidwellii </i> </b> which open with a flat ostiole, are devoid of paraphyses and contain asci in which ascospores from sexual reproduction are formed.
Several young ascus are clearly visible within this perithecium of <b> <i> Guignardia bidwellii </i> </b>.
Ripe axes released from a perithecium produced by <b> <i> Guignardia bidwellii </i> </b>.
A whitish mucus is expelled from several pycnidia; this is made up of numerous agglomerated conidia. <b> <i> Guignardia bidwelli </i> </b> (Black rot)
On this pycnidia resulting from the asexual reproduction of <b> <i> Guignardia bidwellii </i> </b>, the ostiole allowing the release of the spores is clearly visible.
Pycniospores are released at maturity from the pycnidia. These conidia are colorless, ovoid and measure approximately 5 x 7 µm. <b> <i> Guignardia bidwellii </i> </b> (black rot)
The pycniospores of the fungus responsible for <b> black rot </b> are colorless and ovoid.
In Petri dishes, <b> <i> Guignardia bidwellii </i> </b> is characterized by a black-greenish, slow-growing mycelial colony.
The pycniospores emitted by the pycnidia of the imperfect form of <b> <i> Guignardia bidwellii </i> </b>, are embedded in a cirrh, mucilaginous cord.