Final diagnosis


Phytoplasmas (Candidatus phytoplasma spp.)

Piment-Plante
Pepper plot affected by Stolbur. Note the many stunted and chlorotic plants. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Healthy pepper stalk (left), infected with a phytoplasma (right). In addition to its reduced development, the diseased foot is also chlorotic. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Pepper stalk affected by a phytoplasma. In addition to its reduced development, all its leaves are chlorotic, small in size and rolled up. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Detail of chlorotic and curled pepper leaf. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Eggplant plot affected by Stolbur. Note the many stunted and chlorotic plants. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Eggplant stem affected by a phytoplasma. All the leaves are chlorotic and small in size. the veins remain green. Note also the presence of a few slightly anthocyanin leaves. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Young eggplant leaves are smaller and narrower, slightly curled, rather very yellow, only the veins remaining green. They also have an upright habit. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
This eggplant flowers, rather purplish, has a hypertrophied calyx giving it the appearance of a wineskin. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Normal flower (right) compared to an aberrant flower from an eggplant plant infected with <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
The apices of this plant show a stiff, thick stem and very short internodes. The leaflets are small and spoon-shaped. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Proliferating apex of a tomato stalk. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Leaves entirely yellowish and anthocyanin. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Detail of young anthocyaninated tomato leaflets. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Detail of a tomato leaflet with a purplish color and a thicker blade. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Witches' broom phenomena associated with calyx hypertrophies (Big bud). Observed in New Caledonia (<i>Ca. Phytoplasma aurantifolia</i>)
On this tomato plant, the affected tissues are particularly purplish (anthocyanin); both on the leaflets and on the few atrophied to sterile flowers. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
This tomato flower shows an enlarged calyx giving it the appearance of a wineskin. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
These sterile flowers, devoid of petals, contrast greatly with normal flowers. The enlarged petioles give them an erect habit. Note the absence of petals and reproductive organs. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Detail of sterile flowers devoid of petals. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
The young potato leaflets formed are smaller and coiled. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Potato stipe with an upright habit and rolled leaflets. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
The leaflets are particularly rolled up on this potato plant affected by <b><i>Candidatus</i> Phytoplasma solani</b>. (stolbur)
Potato stalk affected by phytoplasma. The leaves are chlorotic and more or less rolled up. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Potato stalk showing aerial tubercles on its stems. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Detail of aerial tubers formed on potato stem. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
Patate-douce
Sweet potato stalk revealing smaller than normal leaves. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
This sweet potato plant shows new, smaller, chlorotic leaves contrasting with the older ones. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)
The leaves on this sweet potato plant, in addition to being smaller and chlorotic, are narrower. <b><i>Candidatus</i> Phytoplasma solani</b> (stolbur)