What symptom is associated with oak root fungus?

The symptom associated with oak root fungus is decayed roots. This particular fungus primarily affects the root system of oak trees, leading to the breakdown of root tissues. The destruction of roots can severely impact the tree's ability to absorb water and nutrients, resulting in overall decline in vigor and health. As the roots decay, they may also become less stable, which can lead to increased vulnerability to other diseases or stressors.

Recognizing the symptoms of oak root fungus is crucial for early detection and management of the disease, as addressing root issues can help save affected trees. Other symptoms like yellow leaves, fruit drop, or leaf curl are typically associated with different types of stress or other plant diseases and are not characteristic of oak root fungus specifically. Thus, focusing on root health and decay is key when diagnosing this fungal issue.