Final diagnosis


Rhizoctonia solani

A brownish canker, rather dry and well defined, surrounds the base of these tomato plants. <i><b>Rhizoctonia solani</b></i>
Attack of <i><b>Rhizoctonia solani</i></b> on the part of a green fruit in contact with the ground. Rather limited, brown to beigeish, the lesions are more or less cankered and present some concentric patterns.
Piment-Plante
A brown canker and lighter in its center, rather dry and well defined, surrounds the base of these pepper plants. <i><b>Rhizoctonia solani</b></i>
Detail of a brown canker and lighter in its center, rather dry and well defined, encircling the lower part of the stem with a foot of pepper. <i><b<Rhizoctonia solani</i></b>
A brown and well-defined canker surrounds the base of these pepper plants. <i><b>Rhizoctonia solani</i></b>
The tissues of the cortex of the canker lesion located at the collar of this pepper plant are dark brown and have partly decomposed. The vascular tissues are now visible. <i><b>Rhizoctonia solani</i></b>
Many leaves of this pepper plant are altered, dried out, and will eventually fall. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
Several chilli leaves rotted, necrosed and subsequently dried out. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
Rhizoctonia-Piment3
Bursting of the stem of an eggplant plant on its lower part close to the ground. <i><b>Rhizoctonia solani</b></i>
Extensive, dry cankered lesion on the lower part of the stem of an eggplant plant. Note the decomposition of the tissues of the cortex. <i><b>Rhizoctonia solani</i></b>
Extensive, dry cankered lesion surrounding the lower part of the stem of an eggplant plant. <i><b>Rhizoctonia solani</i></b>
Aerial tubercles form in the leaf axils of potato plants affected by <i><b>Rhizoctonia solani</i></b>.
Detail of brown necrotic lesions located at the base of the stem of a potato plant. <i><b>Rhizoctonia solani</i></b> (rhizoctonia brown)
Brown necrotic lesions on the base of the stem of a potato stalk. <i><b>Rhizoctonia solani</i></b> (rhizoctonia brown)
Salades
This young plant, attacked early by <i><b>Rhizoctonia solani</b></i>, shows a rotten collar and root system. The altered tissues are dark brown in color. Note that the rot spreads to the base of the main vein of the two young leaves.
Many basal leaves of this lettuce show moist, brown lesions on either side of the midrib; on some of them, the midrib is beginning to rot. (<i><b>Rhizoctonia solani</i></b>)
Brown lesions located on each side of the main vein are clearly visible on the blade of this lettuce leaf. (<i><b>Rhizoctonia solani</b></i>)
A large spot has developed on a lower leaf of this lettuce stalk. First wet, it quickly necrosed, the tissues took on a greenish to greyish-brown hue, while certain veins show a reddish color. <i><b>Rhizoctonia solani</i></b> (Leaf Rhizoctonia - web-blight)
A discreet mycelium can be observed in places on or near this lesion on lettuce leaf. <i><b>Rhizoctonia solani</i></b> (Leaf Rhizoctonia - web-blight)
On this leaf the numerous large lesions cover almost the entire leaf blade. The altered tissues are necrotic, except in the periphery where they are still moist and dark. <i><b>Rhizoctonia solani</i></b> (Leaf Rhizoctonia - web-blight)
Leaf rot on a young Chinese cabbage plant. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
Example of "Leaf Rhizoctonia" syndrome on cabbage. (<i><b>Rhizoctonia solani</i></b>) (web-blight)
The first leaves of this headed cabbage are completely altered and dried out. Upper leaves show extensive, necrotic, brownish interveinal lesions. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
On this headed cabbage leaf, the large lesions are moist and dark brown in color, they are beginning to dry out locally. Note the discrete micro-sclerotia dotting the altered tissues. <i><b>Rhizoctonia solan</b>i</i> (Leaf Rhizoctonia - web-blight)
Large brownish lesions on cabbage leaves. In some places the altered tissues split, some sectors of the limbus will soon break down and disappear. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
On this turnip leaf largely affected by <i>Rhizoctonia solani</i>, the mycelium of this fungus has developed abundantly in places (particularly around the leaf blade), which is unusual! (Leaf Rhizoctonia - web blight)
The mycelium of <i><b>Rhizoctonia solani</i></b> has grown abundantly in places on the leaf blade of this Chinese cabbage leaf. which is rather unusual! (Leaf Rhizoctonia - web-blight)
Rather extensive lesions are visible on this cabbage leaf whose tender tissues have rotted. They are first moist, then livid, and take on a gray-green color as they become necrotic. Locally, the decomposed leaf blade has fallen giving it a partially riddled appearance. (<i>Rhizoctinia solani</i>)
Rather extensive lesions are visible on this cabbage leaf whose tender tissues have rotted. They are first moist, then livid, and take on a gray-green color as they become necrotic. Locally, the decomposed leaf blade has fallen giving it a partially riddled appearance. (<i>Rhizoctinia solani</i>)
rhizoctone-chou-pomme3
Several necrotic and longitudinal lesions have formed at the base of this Chinese cabbage petiole. They are rather moist at first and turn brown quickly. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
Melon
This melon plant shows an altered root system; many roots are brown, some show a more or less rotten cortex. <i><b>Rhizoctonia solani</b></i>
bserve, on the part of these melon in contact with the ground, large irregular lesions, more or less superficially tawny to brown, and presenting small bursts. <i><b>Rhizoctonia solani</b></i>
Large livid and rapidly necrotizing lesion on cucumber leaf. (<i><b>Rhizoctonia solani</i></b>) (Leaf Rhizoctonia - web-blight)
Detail of a lesion on a cucumber leaf. The altered tissues have a grayish tint, the discreet mycelium of <i><b>Rhizoctinia solani</i></b> is visible in places. (Leaf Rhizoctonia - web-blight)
Many rather extensive lesions are visible on this cucumber leaf. They are first moist, then livid, and take on a light beige color as they become necrotic. Locally, the decomposed leaf blade has fallen giving it a partially riddled appearance. (<i><b>Rhizoctinia solani</i></b>) (Leaf Rhizoctonia - web-blight)
Rhyzoctonia-Fruit-Concombre
The root system of this courgette has completely rotted and disappeared. Cortical and contiguous tissues ditute at the neck are dark to reddish brown. <i><b>Rhizoctonia solani</i></b>
Several leaves in contact with wax gourd (<i>Benincasa hispida</i>) are attacked by <i>Rhizoctinia solani</i>. Sections of the lamina grow and become necrotic rapidly and are partially covered by mycelium. (Leaf Rhizoctonia - web-blight)
Leaf and petiolar rots on carrot.. <i><b>Rhizoctonia solani</b></i> (Leaf Rhizoctonia - web-blight)
Mycelium and numerous microsclerotia have formed on these rotten carrot leaves. <i><b>Rhizoctonia solani</b></i>
These two leaves of Guinea red sorrel (<i><b>Hibiscus sabdariffa</i></b>) are covered with more or less extensive necrotic lesions. Several of them show a beigeish tint and are surrounded by a wine-colored halo. (<i><b>Rizoctonia solani</i></b>)
This leaf of Guinea red sorrel (<i><b>Hibiscus sabdariffa</i></b>) shows numerous necrotic lesions of varying extents. Some, beigeish in color, are surrounded by a wine-colored halo. (<i><b>Rizoctonia solani</i></b>)
Note on this leaf of Guinea red sorrel (<i><b>Hibiscus sabdariffa</i></b>) the presence of a dense mycelium, white aerial mycelium in places. (<i><b>Rizoctonia solani</i></b>)
Baselle
Many rotten leaves have disappeared on this foot of basel. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
Large greenish lesion located at the periphery of a basel leaf. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
A few young white micro-sclerotia have formed at the edge of the lamina of this basella leaf near the lesion. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
Lesions of more limited size on basella leaf. Located at the periphery of the lamina, necrotic, some with a purplish halo. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
Several round, well-demarcated, nerotic spots on basella leaf. The leaf tissues of some, decomposed, have fallen, giving the leaf blade a partially holed appearance. Also note the presence of reddish halos around certain spots. <i><b>Rhizoctonia solani</b></i> (Leaf Rhizoctonia - web-blight)
Detail of a lesion on a basel leaf. The necrotic altered tissues present a greyish coloration, they are more humid and black on the periphery. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
Two elliptical and contiguous spots are visible on this basella stem. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
Haricot
Rhizoctone_Haricot_3
Rhizoctone_Haricot_4
Rhizoctone_Haricot_2
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"Mycelial proliferations" on petsai cabbage leaf. The newly formed young mycelium is still white. <i>Rhizoctonia solani</i>
This lesion on melon fruit is partially covered by mycelium of <b><i>Rhizoctonia solani</i></b>.
Rhizoctone_Laitue_4
The mycelium of <i>Rhizoctinia solani</i> is clearly visible at the level of this lesion, the tissues of which have decomposed and fallen off. (wax gourd, (<i>Benincasa hispida</i>)
Detail of the translucent to brown mycelium produced by <i><b>Rhizoctonia solani</i></b> on or near damaged tissue.
Rhizoctonia2
Appearance of the septate mycelium of <i>Rhizoctonia solani</i> observed under a light microscope.
Using a light microscope, the characteristic mycelium of <i><b>Rhizoctonia solani</b></i> can be observed.
Rounded macro-sclerotia of <i>Rhizoctonia solani</i> are clearly visible on these rotting cabbage leaf tissues. (Leaf Rhizoctonia - web-blight)
Young white micro sclerotia are developing on this rotten cabbage leaf. <i>Rhizoctonia solani</i> (Leaf Rhizoctonia - web-blight)
Rhizoctone_Haricot_1
<i><b>Rhizoctinia solani</i></b> microsclerotia formed on the blade of this cucumber leaf.
These ill-defined, progressively browning masses along the midrib of this lettuce leaf are pseudosclerotia of <i><b>Rhizoctonia solani</b></i>.
<i><b>Rhizoctonia solani </b></i> 6