Which of the following may indicate a fungal disease in plants?

• A. Bright green leaves and healthy roots
• B. Faded coloration and leaf drop
• C. Discolored, wilted, or rotten plant tissue
• D. Rapid growth of new shoots

Answer: (C)

The presence of discolored, wilted, or rotten plant tissue is a significant indicator of fungal disease in plants. Fungi often attack plant tissues, leading to symptoms such as wilting, discoloration, and decay as they feed on or invade the plant. Fungal diseases can cause tissue to rot, which is visible in the leaves, stems, or roots, ultimately impacting the overall health of the plant.

In contrast, bright green leaves and healthy roots typically signal a well-nourished plant, which does not suggest illness. Faded coloration and leaf drop may indicate stress or damage—possibly from environmental factors, but not definitively fungal disease. Rapid growth of new shoots can be a sign of vigor or healthy growth, again not a specific indicator of a fungal problem. Therefore, discolored, wilted, or rotten plant tissue serves as the clearest indication of a potential fungal disease affecting the plant.