Final diagnosis


Pythium- phytophthora rots

All the roots of this tomato plant took on a reddish-brown color linked to the parasitism of <i><b>Phytophthora nicotianae</b></i>. (Oomycetes)
Detail of tomato roots more or less altered by <i><b>Phytophthora nicotianae</b></i>. The tissues of the cortex have taken on a reddish-brown hue, and are gradually breaking down. (Oomycetes)
Phytophthora-racines-Tomate2
Young canker appearing at the collar of a tomato plant grown aboveground. Dark brown in color, its outline is rather diffuse. <i><b>Phytophthora nicotianae</b></i>. (Oomycetes)
Extensive, dark-coloured moist lesion encircling the lower part of a tomato plant. <i><b>Phytophthora nicotianae</b></i>. (Oomycetes)
Possessing an altered root system, this eggplant plant shows low chlorotic and withering leaves. <i><b>Phytophthora nicotianae</b></i>. (Oomycetes)
The root system of this eggplant plant has turned brown and is completely rotten. A dark moist lesion surrounds her collar. <i><b>Phytophthora nicotianae</b></i>. (Oomycetes)
Phytophthora-racines-Aubergine3
The entirely rotten root system of this eggplant plant shows few and partly decomposed roots. <i><b>Phytophthora nicotianae</b></i>.
A cut in the fruit shows that the rot has not yet penetrated the cucumber. <i>Pythium</i> sp. (Oomycetes)
A large moist and brownish lesion has started near the peduncle of this cucumber fruit. It is partially surmounted by the mycelium of a <i>Pythium</i> sp. (Oomycetes)
Cucumber fruit more or less covered by the mycelium of a <i>Pythium</i> sp., the external tissues begin to be degraded in some places, gradually turning brown. (Oomycetes)
Pythium-concombre-fruit
Detail of the mycelium covering a cucumber fruit. <i><b>Pythium</i> sp.</b> (Oomycetes)
A cut in the fruit shows that the rot has not yet penetrated the cucumber. <i>Pythium</i> sp. (Oomycetes)
After invading the root system, a <i>Pythium</i> sp. extended to the collar and the lower part of the stem. We can see the presence of its aerial white mycelium in certain places of the moist lesion. (Oomycetes)
A moist lesion surrounds this cucumber stem. Tissues are dark green to brown. Mycelium more or less covers them. <i>Pythium</i> sp. (Oomycetes)
After carefully digging up the root system of this cucumber, we see a reduction in the latter and its browning. The rot in place now reaches the lower part of the stem. (Oomycetes)
After invading the root system, a <i>Pythium</i> sp. extended to the collar and the lower part of the stem. We can see the presence of its aerial white mycelium in certain places of the moist lesion. (Oomycetes)
Detail of a cucumber leaf undergoing rather irreversible wilting. (Oomycetes)
A large lesion, livid at the periphery and necrotic at its center covers a sector of this cucumber leaf attacked by a <i>Pythium</i> sp. (Oomycetes)
The collar of this squash seedling is fully girdled. The more or less rotten tissues are dark green in some places, brown and decomposed in others. <b><i>Phytophthora capsici</i></b> (crown and root rot) (Oomycetes)
Brown to blackish rots attack the young leaves and inflorescences of this zucchini apex. <i><b>Phytophthora capsici</b></i> (<i>Phytophthora</i> blight)
Several spots with brown to blackish, necrotic patches are clearly visible on this young zucchini leaf. <i><b>Phytophthora capsici</b></i> (<i>Phytophthora</i> blight)
This stem is surrounded by a brownish and necrotic lesion. Orange exudates have formed in places on the injured tissues. <i><b>Phytophthora capsici</b></i> (<i>Phytophthora</i> blight)
This zucchini is rotten at its stylized end; we note the presence of a white mat on the periphery and a whitish mucus made up of bacteria mixed with very many sporangia of the fungus. <b><i>Phytophthora capsici</i></b> (<i>Phytophthora</i> blight)
Zucchini fruit surrounded by the dense white mycelium of a <i>Pythium</i> sp. (Oomycetes)
This bean parasitized by a <i>Pythium</i> sp. is partially rotten and covered with a very airy white mycelium. (Oomycetes)
Pythium-Haricot
On the underside of this cucumber leaf, a white, cottony mycelium has developed on and near the injured tissue. <i>Pythium</i> sp. (Oomycetes)
Appearance of oospores of <b><i>Pythium</i> sp.</b> observed under a light microscope. (Oomycetes)
Appearance of the non-septate mycelium of an oomycete.
Appearance of oospores of <b><i>Pythium</i> sp.</b> observed under a light microscope. (Oomycetes)
Young lobed sporangium of <i>Pythium aphanidermatum</i> visible in the damaged root tissues of cucumber roots. (Oomycetes)
Appearance of oospores of <b><i>Phytophthora</i> sp.</b> observed under a light microscope. (Oomycetes)
Two sporangia of a <i>Phytophthora</i> sp. are visible in the altered tissues. (Oomycetes)