Detailed Explanation of the Control Methods for Diseases and Pests of Radix Adenophorae

Radix Adenophorae is a traditional Chinese medicinal herb in our country with a long history of use. It has the effects of nourishing yin and clearing the lungs, benefiting the stomach and promoting 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 the diseases and pests of Radix Adenophorae 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 and feed on the branches and leaves of the root system. Their excrement stimulates the root system to produce root galls, causing the absorption capacity of the root system to decline, and finally causing the seedlings to turn yellow and even die.

Control method: Reasonable crop rotation; avoid continuous cropping or having leguminous crops as the previous crop. When preparing the land and applying fertilizer, scatter 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 probability of this disease occurring.

2. Leaf curl disease

This is a viral disease, mainly caused and spread by red spiders. After the plant is infected, the leaves become wrinkled and distorted, causing the plant to grow slowly. Later, the plants are short and deformed, resulting in extremely low yield of Radix Adenophorae and seriously harming the economic returns of medicinal herb growers.

Control method: Select disease-free planting material when planting. When red spiders occur, spray with clofentezine suspension concentrate to kill them. Before the disease occurs, spray with plant virus inhibitor emulsion or virus A wettable powder, which can provide excellent preventive effects.

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 plants to die prematurely.

Control method: When this disease occurs, it should be controlled promptly. Spraying with fenaminosulf can be used for control, once every 7-10 days, for 3-4 consecutive times, with good results.

4. Stem borer

The stem borer reproduces quickly and can have 4-5 generations per year. Its pupae overwinter on the soil surface. After temperatures rise in spring, they break out of the 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 Radix Adenophorae, causing the rhizomes to become hollow and the flowers to produce no seeds.

Control method: 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, a trichlorfon solution can be used to drench the roots and poison them. In July and August, use electric lights to trap and kill them.

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