What symptom is common in most plant diseases including both tomato black mold and Verticillium wilt?

Wilting is a common symptom observed in many plant diseases, including tomato black mold and Verticillium wilt. This symptom arises due to the disruption of the plant's ability to uptake water and nutrients, often caused by pathogens that damage the vascular system or roots. In the case of Verticillium wilt, for example, the fungus invades the xylem vessels, leading to water transport issues, which subsequently results in wilting and drooping of leaves.

In various plant diseases, especially those affecting the vascular system, wilting serves as an indicator of stress due to pathogen-induced constraints on water movement within the plant. Recognizing wilting as a prominent symptom can help in diagnosing and managing these plant diseases effectively.