What is a common symptom of watery soft rot?

The symptom of watery soft rot is primarily characterized by the presence of soft, mushy tissue in affected plant parts, often accompanied by an unpleasant odor. This condition typically arises in plant tissues due to pathogens such as bacteria, which lead to rapid decomposition and characteristic rot. Among the options provided, black sclerotia do not typically occur with watery soft rot but are associated with other types of diseases, such as those caused by certain fungi.

In the context of the question, while black sclerotia represent a visible symptom associated with some plant pathogens, they are not a common symptom of watery soft rot. The other symptoms listed—leaf discoloration, fragrant blooms, and yellowing of leaves—are also not specific indicators of watery soft rot. Instead, the disease often leads to a general decline and rot of the tissue, which is not accurately captured by any of the other options. Understanding how watery soft rot manifests is crucial for effective diagnosis and management in plant health care.