What are the common diseases of Angelica sinensis? Control methods and planting precautions

Angelica sinensis is a very common and important medicinal plant in daily life, with relatively powerful effects and functions, and relatively high economic value. The market demand for Angelica sinensis is very large, but diseases can affect the yield and quality of Angelica sinensis. So what are the common diseases of Angelica sinensis? How to control them?

1. What are the common diseases of Angelica sinensis

1. Root rot

Root rot, as the name suggests, mainly harms the root system of the planted plant. When the disease occurs, the plant root system turns brown. As the condition worsens, the root system gradually rots and becomes black and water-soaked. Finally, the plant leaves gradually wither and turn yellow, ultimately leading to plant death.

Control methods: Choose a cultivation site with good soil drainage and good air permeability. The cultivation site should preferably be plowed once every two years, and continuous cropping should be avoided. Before planting, disinfect the soil and seeds. If disease is found, deal with it promptly, pull out the diseased plants in time, then destroy them, and disinfect the area around the diseased plants to prevent the virus from spreading.

2. Powdery mildew

At the initial stage of powdery mildew, grayish-white powdery diseased spots begin to appear on the leaves. As time goes on, small black particles gradually appear on the leaves. In the end, the leaves are covered with white powder, and the plant slowly dies.

Control methods: Disinfect the seeds and soil before planting. After disease is found, pull out the diseased plants in time and burn them. Continuous cropping should be avoided, and crop rotation is best. In the early stage of the disease, continuous spraying with 500 times diluted zineb solution can be used for control.

3. Sclerotinia disease

At the initial stage of Sclerotinia disease, the leaves begin to turn yellow, and the root system begins to slowly rot and become hollow. This point is similar to root rot, but the outside of the root system looks normal, while the inside has already rotted and become hollow. The cavity contains multiple small black granular sclerotia.

Control methods: Disinfect the seeds and soil before planting. Lime or plant ash can be applied in the planting holes. When diseased plants are found, use the same handling method as above. In the early stage of the disease, continuous spraying with 500 times diluted zineb solution can be used for control.

4. Rust disease

Rust disease mainly harms leaves in warm conditions. When the disease occurs, rust-colored irregular diseased spots appear on the leaves, along with rust-colored powder. Rust disease is extremely harmful. Its spores have very strong vitality and can survive in the environment. They can cause repeated infection many times, spread extremely quickly, and affect a very wide area.

Control methods: After harvesting Angelica sinensis, gather the remaining diseased plants and leaves and burn them centrally. This can reduce the source of overwintering pathogens. In the early stage of the disease, spray with 25% wettable powder triadimefon at 2000 times dilution.

2. Cultivation precautions

1. Growing environment

Angelica sinensis is suitable for growing in areas with higher altitude. Lower altitude will affect yield, and the quality will also be relatively poor. It is also prone to early bolting. Angelica sinensis from Minxian is world-famous precisely because it is planted in areas above 2400 m in altitude, so both its quality and yield far exceed those of Angelica sinensis planted in other areas.

2. Soil and fertilization

Angelica sinensis prefers fertile, loose, well-drained humus soil. This kind of soil can well provide the nutrients needed for the growth of Angelica sinensis. At the same time, Angelica sinensis is a fertilizer-loving plant and has a relatively large demand for fertility. Nitrogen fertilizer can promote plant growth and increase the accumulation of organic matter; phosphorus fertilizer can strengthen the root system and improve the absorption of nutrients and water; potassium fertilizer can promote photosynthesis and improve the quality of Angelica sinensis. Therefore, reasonable fertilization is very important, especially applying phosphorus and potassium fertilizer in the later stage can improve the quality and yield of Angelica sinensis.

3. Temperature

Angelica sinensis is suitable for growing in areas with higher altitude, so it is suited to high-cold temperature conditions, and it is also relatively sensitive to temperature. The optimal suitable growth temperature is between 20-24 degrees. Maintaining this temperature range during the seedling stage can allow it to emerge quickly.

4. Light

Angelica sinensis is a light-loving plant. In an environment with sufficient light, it grows quickly and robustly, and it is also prone to bolting. Insufficient light will affect the yield of Angelica sinensis. Therefore, when planting, choose sunny sloping land, and appropriately adjust the planting density during planting, which is beneficial to root growth.