Root rot of Chinese onion may be caused by root rot, and continuous cropping is the key factor to cause root rot of Chinese onion. Due to years of continuous cropping, the number of pathogenic bacteria in the soil is increasing, and continuous cropping diseases are inevitable, which is easy to cause root rot and death of green onions. Affected by the continuous rainy weather, the soil moisture is too high, the air permeability decreases, the normal respiration of roots is affected, and the plant's own resistance decreases. If the soil is cultivated at this time, it will cause a lot of wounds, and pathogenic bacteria will take advantage of it, thus aggravating the occurrence of diseases.

Control methods of root rot of Chinese onion;

1, root rot of Chinese onion is controlled by rotation planting, usually once every three years. In the plot where green onions have been planted for many years, they should be rotated with other crops, not with garlic and leeks in Liliaceae. The root of Welsh onion is deeply buried, and the effect is not ideal after the onset. It is the key to prevent it in the early stage.

2. Before the cultivation of green onions, we can water them with the biological bacterial fertilizer of Gannong Shangchenggen Shang Ya to increase the beneficial bacteria in the soil and inhibit the infection of pathogenic bacteria.

3. Pay attention to field drainage in rainy days to avoid waterlogging and rotten roots. Insecticides, such as silver ions, can be used to prevent pests, such as mole rats and onion maggots.

4, it is forbidden to flood irrigation, often small water irrigation. When watering, it is combined with the root system to promote the development of the root system and enhance the ability of the root system to absorb nutrients and water. Improve the ability to absorb water and fertilizer.