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It mainly damages the roots of rapeseed. The main or lateral roots expand into spindle-shaped or finger-shaped tumors. Later, the tumor epidermis becomes dark and rough, and the upper ground is poorly grown, causing the leaves to turn yellow and wilt. Rapeseed root knot nematode disease is a plant disease caused by root knot nematode.它的特征是植物上部地面的生长，叶子是黄色的，侧根和纤维根显着增加，并且在幼根或纤维根上形成不规则的结节，有些是念珠形的。 Root swelling mainly affects the roots of rapeseed, and can be affected during the seedling stage. In severe cases, the seedlings die. In the early stage of the adult stage, the upper part of the ground is not obvious, but the growth is slow and short. In severe cases, it is water-deficient. The base leaves wilt at noon and can recover in the morning and evening; in the later stage, the leaves turn yellow and wither until the whole plant dies. The bacteria usually invade people from the root hair or young roots, and they first grow and develop in the root hair. This stage generally does not show symptoms.当该疾病继续发展并侵入人根皮质组织和层时，宿主细胞会受到刺激，分裂加速并增加体积。由于细胞之间的相互挤压，血管组织异常发育，因此根部肿胀，地上部分显得枯萎或发育不良。 From the outside, the leaves of the lower part of the plant become lighter, and then gradually turn yellow and wilt. When the seedling disease is serious, the seedlings can die. The plants grow short in the adult stage. The outer leaves wilt at noon and recover at night. After a few days, they wilt but cannot recover, and the whole plant dies.