What is a typical symptom of root knot nematodes on ornamental plants?

A typical symptom of root knot nematodes on ornamental plants is the presence of knots or galls on the roots. These galls are a direct result of the nematodes' feeding activity, which disrupts normal root development. As female nematodes invade the roots, they stimulate abnormal growth, leading to these characteristic swellings.

This symptom is particularly significant because it directly indicates an infestation, allowing for more accurate identification of the pest and appropriate management strategies. While other symptoms like leaf discoloration, stunted growth, and wilting can occur in plants affected by various stress factors, the formation of knots is uniquely associated with root knot nematodes specifically. Recognizing the galls is crucial for diagnosing the issue and addressing the pest effectively.