What is the characteristic symptom of Verticillium wilt?

The characteristic symptom of Verticillium wilt primarily includes yellowing and wilting of the leaves. This fungal disease affects the vascular system of plants, leading to disruption in water and nutrient transport. As the disease progresses, the affected areas of the leaves show yellowing, which often begins on one side of the plant and can slowly spread. The wilting occurs because the plant is unable to uptake sufficient water, despite adequate watering, due to the blockage in its vascular tissues.

In contrast, leaf curling is more commonly associated with other environmental stressors or pests rather than Verticillium wilt. Excessive flowering does not typically relate to this disease and can often indicate different growth responses or conditions. Root rot is a separate issue caused by other pathogens and is identified by different symptoms, primarily occurring in the roots rather than the foliage. Understanding these distinguishing symptoms helps in accurately diagnosing plant health issues and taking appropriate actions for management.