Final diagnosis


Didymella lycopersici (Black foot, cankers Didymella)

Several damp, blackish spots affect several tomato leaflets. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i>, <i> Didymella </i> leaf spot)
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Detail of the wet and blackish spots present on the upper surface of a tomato leaflet. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i>, <i> Didymella </i> leaf spot)
Detail of the wet and blackish spots present on the underside of a tomato leaflet. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i>, <i> Didymella </i> leaf spot
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Several more or less evolved spots are visible inside the leaf blade of this leaflet. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i>, <i> Didymella </i> leaf spot)
When a lesion appears at the end of the limbus, it gradually spreads and takes the form of a flame. Be careful not to confuse this symptom with that caused by <i> Botrytis cinerea </i>. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i>, <i> Didymella </i> leaf spot)
The spots, initially brown, have taken on a beigeish tint, while the veins are blackish. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i>, <i> Didymella </i> leaf spot)
Damp, dark brown weathering surrounding the crown of a soil-grown tomato plant. <b> <i> Didymella lycopercisi </i> </b> (black foot with <i> Didymella </i>, <i> Didymella </i> collar canker)
A damp, dark brown weathering has developed at the neck of this tomato plant grown in soilless. <b> <i> Didymella lycopercisi </i> </b> (black foot with <i> Didymella </i>, <i> Didymella </i> collar canker)
<b><i>Didymella lycopersici</i></b>
A moist, dark brown weathering developed from a disbudding wound. In addition to girdling the stem, it now reaches the petiole of a leaf. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i>, <i> Didymella </i> leaf spot)
Canker brown on the periphery, paler in the center, well demarcated. <b> <i> Didymella lycopersici </i> </b> (<i> Didymella </i> canker, <i> Didymella </i> stem canker and fruit rot)
Part of canker well delimited, strewn with a multitude of black dots (fruiting bodies). <b> <i> Didymella lycopersici </i> </b> (<i> Didymella </i> canker, <i> Didymella </i> stem canker and fruit rot)
An early, slightly brownish lesion spread from the stalk scar of this fruit. It is slightly concave and the film turns out to be more or less wrinkled. The presence of melanized mycelial filaments and black pycnidia explains the dark tint visible in the center of the lesion. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i> rot, <i> Didymella </i> fruit rot)
An early, slightly brownish lesion spread from the stalk scar of this fruit. It is slightly concave and the film turns out to be more or less wrinkled. The presence of melanized mycelial filaments and black pycnidia explains the dark tint visible in the center of the lesion. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i> rot, <i> Didymella </i> fruit rot)
A large lesion spoils a significant portion of this tomato fruit. the film turns out to be more or less wrinkled. The presence of melanized mycelial filaments and black pycnidia explains the dark tint visible in the center of the lesion. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i> rot, <i> Didymella </i> fruit rot)
Brown, globular pycnidia are visible in the tissues. <b> <i> Didymella lycopercisi </i> </b> (<i> Didymella </i>, <i> Didymella </i> leaf spot)
Plusieurs pycnides globuleuses plus ou moins matures parsèment les tissus. <b><i>Didymella lycopercisi</i></b> (taches à <i>Didymella</i>, <i>Didymella</i> leaf spot)v
Didymella6
Brown, globular and ostiolate pycnidia are visible in the tissues. <b> <i> Didymella lycopersici </i> </b> (<i> Didymella </i> canker, <i> Didymella </i> foot rot)
This young <b> <i> Didymella lycopersici </i> </b> pycnidia, subglobular to elongated, will gradually become melanized (100 to 270 µm in diameter). There are numerous conidia all around. Let us add that this fungus can form perithecia (120-150 x 100 µm) at the origin of bicellular ascospores (16-18 x 5-6.5 µm). <b> <i>Didymella</i> </b> (<i> Didymella </i> stem canker and fruit rot) canker
Didymella3
The pycnospores are smooth and hyaline, oblong to ellipsoid, even obovoid, uni or bicellular. Their dimensions vary from one conidium to another (3-11 x 2-4.5 µm). <b> <i> Didymella lycopersici </i> </b> (<i> Didymella </i> canker, <i> Didymella </i> stem canker and fruit rot)
Didymella4
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