Which of the following is a common symptom of plant disease?

Leaf discoloration is a common symptom of plant disease because it often indicates a problem with the plant, such as nutrient deficiencies, water stress, or infection by pathogens like fungi, bacteria, or viruses. When a plant experiences stress or disease, the chlorophyll levels can be affected, leading to yellowing, browning, or other changes in leaf color. These color changes can signal to caregivers that the plant may need intervention to restore its health.

In contrast, symptoms such as increased flower production, rapid growth, or increased fruit yield typically suggest a plant is healthy and thriving rather than suffering from disease. These traits are often desirable outcomes of optimal growing conditions rather than indicators of an underlying problem. Therefore, leaf discoloration serves as a clear and recognizable warning sign that something may be wrong with the plant’s health.