Final diagnosis


Sclerotium rot

Piment-Plante
Sclerotium-Piment2
Wet lesion surrounding the base of this pepper plant. altered tissues are locally moist and dark. (<i>Sclerotium rolfsii</i>)
The lower part of this pepper plant is partially covered with the mycelium of (<i><b>Sclerotium rolfsii</i></b>); sclerotia form locally: initially white, they gradually turn brown.
On this moist lesion surrounding this pepper plant, white mycelial palmettes develop superficially. (<i>Sclerotium rolfsii</i>)
By removing the cortical tissues, it is found that the underlying vascular system browns locally. (<i>Sclerotium rolfsii</i>)
In addition to a collar canker, the root system of this pepper plant is completely rotten. The cortex of some roots has locally disappeared. (<i>Sclerotium rolfsii</i>)
On this rotten pepper leaf near the base of the stem, many white to brown sclerotia have formed. (<i>Sclerotium rolfsii</i>)
Athelia-r-poivron
More or less aggregated mycelial filaments visible on these altered tissues. (<i>Sclerotium rolfsii</i>)
Several lower leaves of this aubergine plant are withering; some are more or less chlorotic. (<i><b>Sclerotium rolfsii</i></b>)
Marked wilting of this eggplant plant; the lower leaves are more or less chlorotic. (<i>Sclerotium rolfsii</i>)
Sclerotium-Aubergine8
Moist lesion surrounding the base of the stem of an eggplant plant. (<i>Sclerotium rolfsii</i>)
Moist lesion surrounding the base of the stem of an eggplant plant. It is topped by earth clumped together by the dense mycelium of the fungus. (<i>Sclerotium rolfsii</i>)
White mycelial palmettes grow superficially on these rotten eggplant roots. (<i>Sclerotium rolfsii</i>)
White mycelial palmettes grow superficially on these rotten eggplant roots. (<i>Sclerotium rolfsii</i>)
Detail of root lesions on eggplant. Note that the root cortex is moist, gradually browning, and covered by dense white mycelium. (<i>Sclerotium rolfsii</i>)
Tomato fruit partially colonized by <i>Sclerotium rolfsii</i>. A wet and concave lesion is clearly visible, the epidermis is wrinkled and has broken locally. Mycelium and sclerotia are gradually covering it.
Melon
<i>Sclerotium rolfsii</i>) rot on a melon fruit; this was initiated on the part of the fruit in contact with the ground and is now rising. Mycelium and numerous sclerotia of the fungus superficially cover the large lesion.
Beginning lesion on melon fruit. Weathered and damp tissue takes on a brown hue. Mycelium and young sclerotia are already forming superficially. (<i>Sclerotium rolfsii</i>)
A rot quickly invades this melon fruit in depth, while mycelium and young sclerotia have already formed on the surface of the lesion. (<i>Sclerotium rolfsii</i>)
Sclerotium_Melon5
Rot caused by <i>Sclerotium rolfsii</i> on Nice squash fruit. A dense, white mycelial web covers the lesion.
<i>Sclerotium rolfsii</i> rot on cucumber fruit; this was initiated on the part of the fruit in contact with the ground.
Sclerotium_Pasteque4
<i>Sclerotium rolfsii</i>) rot on a watermelon fruit; this was initiated on the part of the fruit in contact with the ground. Note that the "skin" of the fruit has split open.
Wet lesion, even rotting of a portion of watermelon stem. Note locally the presence of the mycelium of the fungus as well as numerous sclerotia. (<i>Sclerotium rolfsii</i>)
Sclerotium_Pasteque1
Salades
A rot has settled on several leaves and at the neck of this young lettuce which is in the process of collapsing. <b> <i> Athelia rolfsii </i> </b> (<i> Sclerotium rolfsii </i>, "southern blight")
Wet rot at the collar of a young lettuce. <b><i>Athelia rolfsii</i></b> (<i>Sclerotium rolfsii</i>, "southern blight").
Wet rot at the collar of a young lettuce. Numerous sclerotia of the fungus cover it. <b><i>Athelia rolfsii</i></b> (<i><b>Sclerotium rolfsii</i></b>, "southern blight").
Wet rot at the collar of a young lettuce which eventually caused it to wilt and collapse. <b><i>Athelia rolfsii</i></b> (<i>Sclerotium rolfsii</i>, "southern blight").
Older alteration of more or less dark brown color affecting the basal part of a cabbage leaf. Note the yellow halo around it. (<i>Sclerotium rolfsii</i>)
Brown moist lesion settling on the blade of a cabbage leaf. The mycelium of <i>Sclerotium rolfsii</i> covers it fairly quickly.
Large wet brown spot on cabbage leaf. The rotten core tissues have decayed. White mycelial palmettes surround it and a few sclerotia are visible here and there. (<b><i>Sclerotium rolfsii</i></b>)
Large wet brown spot on cabbage leaf. The rotten core tissues have decayed. White mycelial palmettes surround it and some young sclerotia are forming. (<i><b>Sclerotium rolfsii</b></i>)
Microscopie1.jpg
Detail of mycelial webs of <i>Sclerotium rolfsii</i> forming on the surface of a fruit.
Numerous orange to reddish-brown sclerotia a few millimeters in diameter cover these rotting tissues. Note that some of them immature are still white in color. (<i>Sclerotium rolfsii</i>)
Sclerotium-rolfsii3
Sclerotium-rolfsii4
Sclerotium-rolfsii7