Final diagnosis


Armillaria mellea and other root agents

<b> <i> Armillaria mellea </i> </b>: distribution of the disease in an outbreak within a plantation. (root rot)
<b> <i> Armillaria mellea </i> </b>: focus of infection by the fungus ("round disease") (root rot)
On black grape varieties, the leaves of vines affected by <b> <i> Armillaria mellea </i> </b> take on a red color. (root rot)
On black grape varieties, the leaves of vines affected by <b> <i> Armillaria mellea </i> </b> take on a red color. (root rot)
On black grape varieties, the leaves of vines affected by <b> <i> Armillaria mellea </i> </b> take on a red color. (root rot)
On black grape varieties, the leaves of vines affected by <b> <i> Armillaria mellea </i> </b> take on a red color. (root rot)
The crown tissue under the bark has rotted as a result of colonization by <b> <i> Armillaria mellea </i> </b>. (root rot)
Roots affected by <b> <i> Armillaria mellea </i> </b> have their bark turning brown and peeling easily. (root rot)
This root system is completely affected by <b> <i> Armillaria mellea </i> </b>. (root rot)
Appearance of a white mycelial network established between the bark and the wood of this root browned by <b> <i> Armillaria mellea </i> </b>. (root rot)
A dense network of white mycelia has established itself between the bark and wood of this root browned by <b> <i> Armillaria mellea </i> </b>. (root rot)
A white mycelial network has established itself between the bark and the wood of this root browned by <b> <i> Armillaria mellea </i> </b>. (root rot)
In the fall, <b> <i> Armillaria mellea </i> </b> carpophores develop at the foot of the vines. (root rot)
<b> <i> Armillaria mellea </i> </b>: carpophore at the foot of a vine. (root rot)
Several <i> <b> Armillaria melea </b> </i> carpophores have developed at the foot of this vine. They confirm the presence of this formidable agent of root rot and the programmed death of the vine.
By tearing a diseased vine, we see that the carpophores adhere to the vine, and that the root system of the latter is well degraded. <i> <b> Armillaria mellea </b> </i> (root rot)
<i> <b> Armillaria mellea </b> </i>: tufts of carpophores appear at the foot of dead vines. (root rot)
<b> <i> Armillaria mellea </i> </b>: this edible mushroom, with large carpophores, in tufts, is honey-yellow in color. (root rot)
Appearance of the upper surface of a culture of <b> <i> Armillaria mellea </i> </b> on malt-agar medium (root rot)
Appearance of the underside of a culture of <b> <i> Armillaria mellea </i> </b> on malt-agar medium. Note the presence of brown to black rhizomorphs. (root rot)
Appearance of <b> <i> Rosellinia necatrix </i> </b> mycelium. (woolly root rot)
A bulge is clearly visible on this brown, septate mycelium of <b> <i> Rosellinia necatrix </i> </b>. (woolly root rot)
Fructifications of <b> <i> Roesleria subterranea </i> </b>.