What are the typical symptoms of bacterial spot in grain sorghum?

Bacterial spot in grain sorghum is characterized by small, circular water-soaked lesions on the leaves. These symptoms appear as tiny spots that can eventually turn dark brown or black, indicating tissue necrosis. The water-soaked appearance of these spots is a distinctive sign of bacterial infections in plants. As the infection progresses, these spots can merge, leading to larger areas of necrotic tissue, which can ultimately affect plant health and yield.

The other symptoms listed do not accurately describe bacterial spot. For example, large black patches may suggest other diseases or issues, such as fungal infections; white powdery spots are typically related to powdery mildew, another distinct plant disease; curled leaves may indicate various stresses, including viral infections or environmental factors rather than specifically bacterial spot. Thus, recognizing the small, circular water-soaked spots is key to identifying bacterial spot in grain sorghum.