How root knot disease causes damage in carnation?

Root galls on carnation are caused by parasitic root nematodes, Meloidogyne spp. The most characteristic symptom of this disease is the profuse root swellings that assume innumerable shapes. The microscopic eel-shaped larvae of the nematode infect roots at the tip, where the tissue is soft and cell division is occurring. Symptoms of nematode-infected plants are lack of Vigour, stunting, and pale green to yellow leaves that tend to wilt in warm weather.