What symptom might indicate a disease on individual plants?

The presence of small, circular, tan-colored lesions surrounded by brown or purple borders typically indicates a disease affecting individual plants. These symptoms are characteristic of various fungal or bacterial infections, where the lesions can signify tissue damage caused by pathogens. The distinct borders of these lesions often help in identifying the specific disease and its severity.

In contrast, thick, lush growth suggests healthy plants that are thriving, while stunted growth with yellow blotches could be indicative of nutrient deficiencies or environmental stress rather than an outright disease. Healthy green leaves with no discoloration suggest that the plants are free from disease or other stressors, illustrating normal physiological function. Thus, the unique symptom of lesions with distinct coloration serves as a clear indicator of a potential disease issue on the affected plants.