Final diagnosis


Bacterial wilt (Ralstonia solanacearum)

One or several leaves sometimes located on one side of the diseased plant show a unilateral lamina wilting and/or yellowing often resulting in its desiccation. Vascular diseases
The infected area of the lamina first turns light green then yellow and finally becomes necrotic between the veins and dries up. <b><i>Ralstonia solanacearum</i></b> (bacterial wilt)
Sometimes a longitudinal, dark brown to black streak can be observed on the chlorotic stem tissues. <b><i>Ralstonia solanacearum</i></b> (bacterial wilt).
When the stem is cut longitudinally, one may observe that the vessels and sometimes the adjacent tissues (pith, cortex) turn brown. Vascular disease
The veins are first light brown then develop dark brown to black streaks. The cortex and the pith may become infected and develop the same colouring. <b><i>Ralstonia solanacearum </i></b>(bacterial wilt).
Sometimes the vessels have a more marked colour with some zones turning darker. Vascular disease