See Celery for a detailed discussion of these diseases.
Symptoms appear as wilting and a slow or rapid collapse of the plant.
The roots can appear brown and water-soaked instead of white. A water-soaked lesion can often appear at the base of the stem. Control can be achieved by using a two-year rotation with nonsusceptible plants, such as corn, to prevent the buildup of pathogenic organisms. Leaf blight, Septoria spp. This disease appears as small, tan leaf spots with black dots across the surface of the spots.