The Latest Control Methods for Diseases and Pests of Glehnia (Sand Ginseng)

Glehnia is a traditional Chinese medicinal herb in China with a long history of use, possessing the effects of nourishing yin and clearing the lungs, benefiting the stomach and promoting body fluid production, resolving phlegm, and tonifying qi, and it is distributed throughout the country. At present, it is cultivated on a large scale, and during planting, diseases and pests can harm its yield, so how should Glehnia diseases and pests be controlled? Let's take a look together.

1. Root-knot nematode disease

It generally occurs in early May. Nematodes invade from the root system, sucking the sap of the roots, and their excrement stimulates the roots to produce root galls, causing the absorption capacity of the root system to decline, and ultimately causing the seedlings to turn yellow and even die.

Control methods: Reasonable crop rotation, avoid continuous cropping or having leguminous crops as the previous crop. When preparing the soil and applying fertilizer, broadcast nematicide granules or carbofuran granules at 22-3 kg per mu, and mix them evenly with the soil. This can kill the nematodes lurking in the soil and reduce the incidence of this disease.

2. Leaf curl disease

This is a viral disease, mainly caused and spread by spider mites. After the plant is infected, the leaves become wrinkled and distorted, causing the plant to grow slowly, and later the plants become short and deformed, resulting in extremely low yields of Glehnia and seriously harming the economic returns of medicinal herb growers.

Control methods: Choose disease-free planting material when planting. When spider mites occur, spray with clofentezine suspension concentrate to kill them. Before the disease occurs, spray with plant disease spirit emulsion or virus A wettable powder, which can provide excellent preventive effect.

3. Rust disease

Also known as yellow pox disease, it generally occurs in July. When the disease occurs, reddish-brown lesions appear on the stems and leaves. The lesions gradually spread, and in the later stage the surface of the lesions ruptures, producing rust-colored spore powder, causing the plant to die prematurely.

Control methods: When this disease occurs, timely control is needed. Spray with ferrous sulfate fungicide for control, once every 7-10 days, for 3-4 consecutive times, for a better effect.

4. Stem borers

Stem borers reproduce quickly, with 4-5 generations occurring each year. Their pupae overwinter on the soil surface, and after temperatures rise in spring, they break out of their cocoons and begin laying eggs. From May to October, when the larvae cause more serious damage, the larvae bore into the stems, leaves, roots, and flowers of Glehnia, causing the roots and stems to become hollow and the flowers to produce no seeds.

Control methods: During the egg stage or when the larvae have just hatched, spray with trichlorfon or dimethoate for control. If the larvae have already bored into the plant, use trichlorfon solution to drench the roots and poison them. In July-August, use electric lights to trap and kill them.

The above is an introduction to the control methods for diseases and pests of Glehnia. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.