Prevention and control measures of root rot of Angelica sinensis

The root rot of Angelica sinensis is a fungal disease, which can easily cause root rot or even death of the whole plant, so it is also called root rot, which has a great impact on the economic benefits of farmers. So how to control the root rot of Angelica sinensis? Come and have a look with the editor.

1. Occurrence of symptoms

Root rot mainly harms the rhizome of the plant, the disease is that the root of the plant except brown, and then rot in the form of water, leaving only a fibrous shell, the stem is brown water stains, the aboveground parts stop growing, and the plant is short. There will also be oval brown spots on the leaves, which in severe cases will cause the leaves to wither and sag, and eventually the whole plant will die. When the disease is serious, the leaves are withered and yellow, and the roots become black and rotten. At this time, the plants can be easily pulled up and often mixed with stem nematodes.

2. The regularity of the disease

The pathogen overwintered with hyphae and conidia on the soil and seedlings on the diseased day and became the source of infection at the beginning of the next year. The disease usually began in May, reached the peak from July to August, and alleviated gradually with the decrease of temperature in September. The pathogen is mainly concentrated in the tillage layer, the high temperature and humidity environment is conducive to its occurrence, frequent underground insect pests and more root wounds are conducive to the occurrence of the disease. In addition, excessive irrigation, stagnant water after rain and poor root development will also aggravate the degree of disease.

3. prevention and control measures

① selected seeds and seedlings

Infected seeds are one of the main sources of pathogens, so diseased plants should be eliminated in time during seed collection. During winter storage, diseased seedlings should be eliminated in time because of improper storage to promote the occurrence of pathogens.

② selected the plot.

Planting Angelica should choose the land with sandy soil, drainage and permeability, not continuous cropping, and potato rotation which is easy to be infected with root rot.

③ high ridge cultivation

High ridge cultivation is not suitable for stagnant water, and the soil water content is moderate and the ventilation is good, forming a soil environment which is conducive to root growth but not conducive to the occurrence of pathogens.

④ disinfection

The soil can be disinfected before transplanting, and the seedlings can also be soaked in Bordeaux solution of 1RU 150 for 10-15 minutes, dried and planted, and the seeds can be mixed with carbendazim and topiramate.

⑤ medicament propagation

If the disease is removed and burned in time after the disease is found, a handful of lime powder can be sprinkled in the disease hole, and at the same time, the disease area can be fully sprayed with 600-1000 times of Metalaxyl, 1000-fold solution of Zhongshengmycin or 50-1000 times of Metalaxyl zinc to prevent the spread of the disease.

The above is the introduction of the prevention and control measures of Angelica root rot. I hope it can help you. If you want to know more about it, please follow us.