Final diagnosis


Anthracnosis (Colletotrichum spp.)

Large lesion with a diffuse outline caused by a <i>Colletotrichum</i> sp. (anthracnosis)
This circular and concave spot covered by numerous microsclerotia of <i>Colletotrichum</i> sp. (anthracnose)
All of these fruits show large spots in their stem area. The latter are caused by a <i>Colletotrichum</i> sp. which penetrated the fruit via the bursts that occurred in this part of the fruit. (anthracnose)
Detail of large lesions on fruit induced by <i>Colletotrichum</i> sp. in the tropics. (anthracnose)
A few discreet small chlorotic lesions with a necrotic center dot several leaves of this eggplant plant. <i>Colletotrichum</i> sp. (anthracnose)
A few discreet small chlorotic lesions with a necrotic center dot several leaves of this eggplant plant. <i>Colletotrichum</i> sp. (anthracnose)
Small lesions, brownish necrotic spots are scattered on this eggplant leaf. They all have a more or less marked yellow halo. <i>Colletotrichum</i> sp. (anthracnose)
Detail of some anthracnose spots on the upper side of the blade of an eggplant leaf. <i>Colletotrichum</i> sp.
Detail of some anthracnose spots on the underside of the blade of an eggplant leaf. <i>Colletotrichum</i> sp.
Numerous small rather circular lesions of a few anthracnose spots on the upper side of the blade of an eggplant leaf. <i>Colletotrichum</i> sp.
On this eggplant, the brown to blackish lesions are already more extensive. Circular to irregular, some confluent in places <i>Colletotrichum</i> sp. (anthracnose)
Detail of a large anthracnose lesion on eggplant fruit. Note the presence of tiny, concentrically distributed salmon mucous clumps. <i>Colletotrichum</i> sp.
Large areas of this fruit are rotten. The altered tissues have gradually superficially collapsed, and are more or less wrinkled. <i>Colletotrichum</i> sp. (anthracnosis)
Detail of tiny structures produced by a <i>Colletotrichum</i> sp. beginning to form on fruit lesions. (anthracnosis)
Detail of tiny structures produced by a <i>Colletotrichum</i> sp. well developed on fruit lesions. (anthracnose)
Fully rotten eggplant fruit. <i>Colletotrichum</i> sp. (anthracnose)
Piment-Plante
Several leaves of this pepper plant show necrotic spots on some leaves. <i>Colletotrichum</i> sp. (anthracnose)
A few spots are irregular in shape, grayish in color with a dark brown border. <i>Colletotrichum</i> sp. (anthracnose)
Some spots are rather extensive, the plant tissues in the center of the latter lighten and take on a gray tint, dry out and split. A large sector of the leaf blade has turned yellow. <i>Colletotrichum</i> sp. (anthracnose)
On this pepper leaf, the spots are wetter, irregular and surrounded by a fairly marked yellow halo. <i>Colletotrichum</i> sp. (anthracnose)
This pepper leaf is covered with irregular necrotic lesions, more or less extensive, of a brown-grey hue. <i>Colletotrichum</i> sp. (anthracnose)
Detail of a young lesion on a pepper leaf (upper side). <i>Colletotrichum</i> sp. (anthracnose)
Detail of an advanced lesion on a pepper leaf (upper side). Note the degradation of the central tissues which eventually split. <i>Colletotrichum</i> sp. (anthracnose)
Detail of a young lesion on a pepper leaf (underside). <i>Colletotrichum</i> sp. (anthracnose)
Young moist, circular and reddish lesions on green pepper fruit. <i>Colletotrichum</i> sp. (anthracnose)
More advanced circular spot on green pepper fruit. Brownish in color, it shows some concentric zones. <i>Colletotrichum</i> sp. (anthracnose)
Very evolved circular spot on the rotating pepper fruit. A large central portion of the lesion is covered with black microsclerotia of the fungus and acervuli that still bear little fruit. <i>Colletotrichum</i> sp. (anthracnosis)
Symptom of apical necrosis invaded secondarily by a <i>Colletotrichum</i> sp.. Note the blackening of the altered tissues following the numerous microsclerotia formed. (anthracnose)
Detail of anthracnose lesions on pepper fruit, many mucous clumps covering them. <i>Colletotrichum</i> sp.
Numerous acervuli more or less distributed in a concentric fashion line this circular lesion on green pepper fruit. <i>Colletotrichum</i> sp. (anthracnose)
Detail of the stroma and acervuli formed by a <i>Colletotrichum</i> sp. on a spot on pepper fruit. (anthracnose)
Healthy chilli fruit (left) and fruit completely affected by <i>Colletotrichum</i> sp. (to the right). (anthracnose)
Colletotrichum-Concombre1
Beginning lesions on cucumber leaf. Rather circular, sometimes angular, they are brown and necrotic in their center, the leaf tissues show a more livid tint on the periphery. <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
Many brownish spots are clearly visible on the leaves of this cucumber. Note the riddled appearance of some of them. <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
A few young, elongated, cankerous lesions dot this cucumber stem. They have a beige hue and are slightly depressed. <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
Colletotrichum-Concombre2
Colletotrichum-Concombre3
Colletotrichum-Concombre4
Brown spots dot several leaves of this zucchini plant. Note the well-marked halo around some of them. <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
Detail of some stains on zucchini leaf; they are brown, necrotic, lighter in their center, with a yellow tint of the limbus on the periphery of the lesions. <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
Appearance of spots on the underside of the lamina of a courgette leaf. Note the rib tracing of certain spots. <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
Advanced necrotic lesions on pumpkin leaf. The spots have taken on a brownish tint, their center is lighter, their periphery chlorotic. <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
This calabash leaf is covered with young lesions of anthracnose. They are small, chlorotic, even necrotic. <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
Appearance of the spots on the underside of the calabash leaf. Note the greasy nature of the lamina and its partial yellowing. <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
Large fatty and elongated lesions, dark brown on gourd stem. <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
Microscopie1.jpg
Numerous acervuli are visible in profile on these damaged tissues. They contain more or less black and cloisonné bristles (or setae). <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
Numerous acervuli are visible in profile on these damaged tissues. They contain more or less black and cloisonné bristles (or setae). <i><b>Colletotrichum orbiculare</b></i> (anthracnose)
Observation under a light microscope makes it easier to distinguish an acervulus. It has several brown, septate bristles and the spores are clumped together in the form of mucus. <i><b>Colletotrichum</i> sp.</b> (anthracnose)
Acervulus produced by a <i><b>Colletotrichum</i> sp.</b> seen in section under a light microscope. Note the presence of a few cylindrical conidia. (anthracnose)
Observation under a light microscope makes it easier to distinguish an acervulus. It has several brown, septate bristles and the spores are clumped together in the form of mucus. <i><b>Colletotrichum</i> sp.</b>(anthracnose)
Acervulus produced by a <i><b>Colletotrichum</i> sp.</b> seen in section under a light microscope. Note the presence of numerous elongated and arcuate conidia. (anthracnose)
Acervulus produced on a pepper leaf by a <i><b>Colletotrichum</i> sp.</b> seen in section under a light microscope. Note the presence of numerous elongated and arcuate conidia. (anthracnose)
Detail of cylindrical <i><b>Colletotrichum</i> sp.</b> conidia. (anthracnose)
Detail of conidia of <i><b>Colletotrichum</i> sp.</b> elongated and arcuate. (anthracnose)
Detail of a bristle or setae and numerous conidia formed by the acervulus. This seta shows a transverse septum. <i><b>Colletotrichum</i> sp.</b> (anthracnose)
Binocular close-up view of microsclerotia formed on Solanaceae roots by <b><i>Colletotrichum coccodes</i></b>.
Outline of a microsclerotia of <b><i>Colletotrichum coccodes</i></b> forming in a cell of the cortex.