What type of damage does root knot nematode primarily cause to plants?

Root-knot nematodes are a specific type of plant-parasitic nematode that primarily cause damage through their interaction with plant roots. When these nematodes invade the roots, they induce the formation of galls or "knots" which disrupt normal root function. This damage affects the plant's ability to absorb water and nutrients, leading to stunted growth, wilting, and overall reduced vigor.

The key characteristic of root-knot nematode damage is the development of these galls, which is a distinct manifestation of their feeding habits. While other forms of plant damage, such as defoliation, flower damage, or leaf curl, may be associated with various pests and diseases, root-knot nematodes specifically target the root systems of plants. Their impact is primarily internal and directly connected to how effectively a plant can grow and thrive based on its root health. Understanding this specific type of damage helps in identifying the signs and taking appropriate measures for management and control.