What is a common symptom of bacterial blight?

• A. Large, brown lesions on roots
• B. Small, angular, light green spots on leaves
• C. Stunted growth throughout the plant
• D. Complete leaf drop

Answer: (B)

The identification of small, angular, light green spots on leaves is indeed a common symptom of bacterial blight. This particular symptom arises due to the bacteria's effect on the plant tissue, causing localized necrosis and chlorosis. As the bacterial infection progresses, these spots can become more pronounced, leading to a larger area of damage on the leaf surface.

Bacterial blight affects the way the plant conducts photosynthesis and can hinder growth as the leaf's surface area diminishes. The angular shape of these spots is a key characteristic that distinguishes bacterial blight from other diseases, as the necrotic areas are often limited by the leaf's venation.

In contrast, other options describe symptoms more typical of different plant diseases or issues. For instance, large, brown lesions on roots may indicate root rot rather than a foliar disease like bacterial blight. Stunted growth throughout the plant can be a result of a variety of issues, including nutrient deficiencies or root diseases, but is not specific to bacterial blight. Complete leaf drop is also more indicative of stress from environmental factors or severe forms of other diseases rather than the typical progression seen in bacterial blight.