Final diagnosis


Colletotrichum coccodes (Anthracnose, root rot)

The root lesions are more important, the strongly altered cortex presents a marked brown tint <b> <i> Colletotrichum coccodes </i> </b>
Several roots colonized by <b> <i> Colletotrichum coccodes </i> </b> show a more or less brown and dull cortex.
A more precise observation makes it possible to distinguish brown necrotic areas covered with black dots. <b> <i> Colletotrichum coccodes </i> </b> (black dots)
On this portion of the root, one can easily perceive the parasitic potentialities of <b> <i> Colletotrichum coccodes </i> </b> (black dots). deep, brown lesions are progressing into the cotex.
In the most affected root zones, the tissues of the cortex are quite brown, rather moist, and gradually decompose. We can now clearly distinguish the microsclerotia of <b> <i> Colletotrichum coccodes </i> </b> (black dots).
The number of microsclerotia formed on the roots is sometimes considerable. p <b> <i> Colletotrichum coccodes </i> </b>
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On this root system resulting from a soilless culture, the cortex is completely decomposed and many microsclerotia have formed on it and on the central cylinder. <b> <i> Colletotrichum coccodes </i> </b>
In soil-less cultivation, the roots colonized by <b> <i> Colletotrichum coccodes </i> </b> sometimes have a different appearance: the browning of the cortex may be less marked, the tissues are rather discolored. Microsclerotia and acervuli with black bristles are still visible. <b> Black dot root rot </b>
Several slightly depressed yellowish spots are visible on this fruit. Their center gradually turns brown. <b> <i> Colletotrichum coccodes </i> </b> (anthracnose)
These black structures, which are less than a millimeter in diameter, are in fact microsclerotia of <b> <i> Colletotrichum coccodes </i> </b> (anthracnose). They are more or less immersed in the tissues under the epidermis.
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Acervuli often form on microsclerotia in particular. They are very characteristic because they have erect black bristles (<i> setae </i>), as well as unicellular hyaline conidia. <b> <i> Colletotrichum coccodes </i> (root rot, black dot root rot) </b>
The microsclerotia are bristling with black bristles (<i> setae </i>); these, present inside the acervuli, allowing to characterize the genus <i> Colletotrichum </i>. <b> <i> Colletotrichum coccodes </i> </b>