What is a significant effect of root-knot nematodes?

Root-knot nematodes are plant-parasitic nematodes that cause noticeable physical changes in the roots of affected plants. The formation of small knots or galls on the roots is a key characteristic of root-knot nematode infestation. These galls form as a result of the nematodes inserting themselves into the root tissue, which disrupts the plant's normal root development and function.

While other symptoms such as wilting of foliage and reduced plant size can occur as a result of the damage caused by these nematodes, the presence of small knots is a direct indicator of their activity. Root discoloration may also happen due to various stressors, but the distinct galls are a hallmark sign that specifically points to the presence of root-knot nematodes. Recognizing these galls is crucial for diagnosis and for implementing effective management practices.