What is a common visual indicator of a disease caused by pathogens?

A common visual indicator of a disease caused by pathogens is spots or lesions on leaves. These symptoms can manifest as discolored areas, typically resulting from the action of fungi, bacteria, or viruses that infect plant tissues. These pathogens can disrupt normal cellular functions, leading to the formation of necrotic spots, blight, or even total leaf collapse. Observing these spots is essential for early detection and management of plant diseases.

Strong root growth, bright green foliage, and vibrant blooms typically suggest that a plant is healthy and thriving. In contrast, these conditions usually do not indicate the presence of disease. Strong root growth would generally reflect a well-nourished plant, while bright green foliage and vibrant blooms indicate vigor and proper nutrient uptake. Thus, these indicators would not be associated with pathogen-induced diseases.