In almost all cases, Leaf Nematodes are fatal to African Violets. The best control for Leaf Nematodes is, therefore, prevention. Distinguishing Symptoms Leaves have shiny, brown spots on the underside of them . These shiny, brown spots are especially visible between the veins.
Stems swell up .
If your African Violet has these symptoms, it probably has Leaf Nematodes. Other Symptoms Leaves wilt . They may appear translucent brown with a soft, jelly-like consistency. Leaves pale . They appear yellow or grayish in color.