First, the characteristics of Chinese cabbage root rot.

The root rot of Chinese cabbage mainly harms roots and rhizomes, with water stains at the initial stage and gradual decay. After infection, the vascular bundle in the infected area turned brown and the stem contraction was not obvious. The initial symptoms of the plant were not obvious, and the disease gradually worsened, and the leaves of the diseased plant withered and turned yellow until the plant died. Often there are only a few plants in a field, and with rainwater and irrigation water, they are quickly scattered in the field, and finally there is no harvest in the whole garden. Root rot of Chinese cabbage is a soil-borne disease, which overwinters mainly by field diseases and belongs to fungal diseases. Pathogens are mainly transmitted through wound infection, field irrigation, rainwater and agricultural operations. Continuous cropping, application of immature organic fertilizer and field water accumulation are beneficial to the occurrence of this disease.

Second, the causes of root rot of Chinese cabbage.

1. Outdoor humidity.

Chinese cabbage has shallow roots and weak absorption capacity, but it grows on the ground and has strong transpiration capacity, so it requires high soil water content in the growth process, but too high soil water content will lead to rotten roots of Chinese cabbage. The main reason of high humidity is that excessive rainfall or irrigation water leads to water accumulation in the field, soil permeability becomes worse, leading to anoxic root rot and root rot.

2. continuous cropping.

Continuous cropping is the key to improve the bacterial content in field soil. The longer the same crop is planted in the same area, the more serious the disease will be. Root rot not only harms Chinese cabbage, but also occurs in cruciferous crops, so continuous cropping is one of the key factors leading to root rot.

3. Bacteria carry.

The occurrence of root rot in the field is mostly caused by pathogenic bacteria in the field, mostly in the soil, but it is also possible that the seeds carry pathogenic bacteria, farm tools carry bacteria or apply immature organic fertilizer, which eventually infects Chinese cabbage and leads to the occurrence of root rot in Chinese cabbage.

These are the characteristics and causes of root rot of Chinese cabbage. I hope my answer is helpful to you.