Wilted, yellowing leaves and stunted plants can often signal an infection of club root in cruciferous plants such as cabbage, cauliflower and broccoli, causing significant economic losses to farmers. The most distinctive symptom, however, is the abnormal enlargement, or clubbing, of roots where the disease process is taking place. Clubs may cover only sections of roots or they may cover the entire root system of the plant. In some cases, plants may not exhibit any symptoms save for a few small clusters of clubs on the roots.