Brassica napus

The root system of the seedling stage is poorly developed, the growth is slow, and the roots are small; the root tip has small tumors; the root neck is swollen, the severe epidermis becomes brown, the cortex is cracked or even necrotic, and the seedlings are easy to die. After the transplanting of rapeseed, it is green and slow, not new leaves, leaf deformity, small and thick, leaf edge curling, leaf veins chlorotic to yellow, leaf color dark green dull, leaf edge to whole leaves become purple or purple .

During the bud stage, the rhizome is enlarged, the roots are hollow, and the root epidermis is yellowish brown. The leaves are thick and fragile, the edges of the leaves are rewinded, the leaves are raised, the bumps are uneven, and the leaves become chlorotic. The stolons are not normally developed, the stalks are short, the plants are dwarfed, and even withered.

The root and leaf symptoms of the flowering stage are the same as before. The main inflorescence grows slowly, dwarfs, and the top atrophy. The flowering is late and there is no obvious final flowering period. The flower is degraded, the pollen development is abnormal, the flower is formed, and the pod is not formed normally.

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