What is a characteristic feature of stalk rot diseases in sorghum?

The characteristic feature of stalk rot diseases in sorghum is the presence of soft and discolored stalks. This symptom arises when pathogens infect the stalk tissue, leading to internal decay and structural weakening. As the disease progresses, it can cause significant physiological stress to the plant, resulting in a compromised ability to transport nutrients and water, which ultimately affects the overall health of the sorghum plant.

In contrast, vivid yellow coloring of leaves is typically associated with nutrient deficiencies or other stress factors, rather than stalk rot specifically. The presence of blue mold is characteristic of different fungal infections and not specifically related to stalk rot in sorghum. Heavy fruit set suggests a healthy plant response to environmental conditions and is not a sign of stalk rot disease, which would instead lead to reduced yields or compromised grain quality. These distinctions are crucial for accurate diagnosis and effective management of crop diseases.