Final diagnosis


Clavibacter michiganensis subsp. michiganensis (Bacterial canker )

Several completely desiccated plants are visible in this greenhouse culture. Note that they are distributed on the same line, which characterizes an already old attack of <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
We also find on this leaf a unilateral distribution of withered and withered leaflets, characteristic of vascular disease. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Several livid interveinal patches are developing on these slightly wilted leaflets. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
<b><i>Clavibacter michiganensis</i> subsp. <i>michiganensis</i></b> ( bacterial canker)
Several livid interveinal patches are developing on this slightly withered leaflet. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Subsequently, these areas gradually necrotize and take on a beige color. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
On this plant, many leaflets only show more or less sectorial yellowing, sometimes accompanied by peripheral dryness at the origin of the leaf curling. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Several longitudinal bursts caused by <b> <i> Clavibacter michiganensis </i> subsp. <i>michigansensis</i> </b> are visible on this tomato stem. (bacterial canker)
Small white canker spots on the stem. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Tiny beige canker lesions are visible on this stem. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Small dark brown canker spots, white at the start of the attack. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Small, canker-covered lesions on tomato stems. <b> <i> Clavibacter michiganensis </i> subsp. <i>michigansensis</i> </b> (bacterial canker)
Yellowing of the marrow at the edge of the vessels. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
<b><i>Clavibacter michiganensis</i> subsp. <i>michiganensis</i></b> (bacterial canker)
A longitudinal cut in this petiole shows a slight vascular browning on one side, and a much more marked alteration of the vessels and contiguous tissues on the other, in particular the pith which takes on a reddish brown tint. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
The removed cortex reveals the yellowing, even browning of the vessels. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
"Dry" browning and hollowing out of the marrow at the edge of the vessels. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Yellowing of the vessels, browning between the marrow and the vessels which are separated by small cavities in some places. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Appearance of internal alterations of the stem associated with the parasitism of <b> <i> Clavibacter michiganensis </i> subsp. <i>michigansensis</i> </b>. (longitudinal section, advanced symptoms) (bacterial canker)
Appearance of internal alterations of the stem linked to the parasitism of <b><i>Clavibacter michiganensis</> subsp. michigansensis</b>. (cross section, mild symptoms) (bacterial canker)
Appearance of internal alterations of the stem associated with the parasitism of <b> <i> Clavibacter michiganensis </i> subsp. <i>michigansensis</i> </b>. (cross section, advanced symptoms) (bacterial canker)
Longitudinal canker on tomato stalk. A sepal has completely "melted". <b> <i> Clavibacter michiganensis </i> subsp. <i>michigansensis</i> </b> (bacterial canker)
Small white spots, brown in the center (having the appearance of a bird's eye). <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Several whitish to necrotic pits, sometimes split in their center, dot this green fruit. They are haloed with fatty rings. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Canker spots on green fruit. <b> <i> Clavibacter michiganensis </i> subsp. <i>michigansensis</i> </b> (bacterial canker)
Small spots on beige to white fruits (2-3 mm in diameter), necrotic and brown in the center, having the appearance of a bird's eye. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)
Clavibacter1
Observation under a microscope of a longitudinal section taken in the rod near the vessels reveals a mucus made up of innumerable bacteria. <b> <i> Clavibacter michiganensis </i> subsp. <i>michiganensis</i> </b> (bacterial canker)