What are the control methods for burdock pests and diseases?

Burdock is a biennial or triennial herbaceous plant of the Asteraceae family. It is both a vegetable and a medicinal herb, with extremely high edible and medicinal value. At present, many regions in China have begun to cultivate it. After years of development, its planting area is quite considerable, but during cultivation it suffers from pests and diseases, which affect the yield and quality of burdock. So how should burdock pests and diseases be controlled? Let's take a look.

1. Black spot disease

Black spot disease mainly harms the leaves and stems of burdock. When the disease occurs, multiple small spots appear on the leaves, and the multiple spots merge together, causing the leaves to wither. When humidity is high, the spots are rusty brown, and a black mold layer grows on the spots. When the stems are infected, oval-shaped spots appear. As the disease progresses, the spots become sunken, turn black and moldy, and finally cause the entire plant to lodge.

Control methods: Diseased leaves should be removed promptly from infected plants, and after harvest, diseased residues should be cleared and either burned in a centralized manner or buried deep. When the disease occurs, fungicides such as chlorothalonil and captan can be sprayed for control.

2. Powdery mildew

It mainly harms the leaves of burdock. Affected leaves develop unevenly distributed white powdery spots, which later merge together, covering the leaf surface with a large amount of powder until the leaves wither and turn yellow. The disease is more severe in warm and humid environments. In addition, insufficient soil fertility or excessive application of nitrogen fertilizer can also induce this disease.

Control methods: Strengthen field management, increase base fertilizer application, pay attention to the rational combination of nitrogen, phosphorus and potassium, avoid excessive application of nitrogen fertilizer, and increase the disease resistance of plants. After the rainy season, drain water promptly to reduce humidity. Triadimefon or wuyimycin can also be sprayed for control.

3. Angular leaf spot

It mainly harms plant leaves. When the disease occurs, water-soaked spots appear on the leaves. In the early stage, they are light brown and polygonal, and eventually cause the leaves to perforate and die. Stems can also be infected. When stems are infected, they also appear water-soaked in the early stage and expand longitudinally along the stem. In severe cases, it causes cankers or cracks, turning brown and drying up.

Control methods: In the early stage of the disease, copper ammonium complex, copper oxychloride, and fosetyl-aluminum · copper can be sprayed for control, with good results.

4. Pests

The main pests of burdock are wireworms, aphids and white grubs. They all cause damage as larvae or adults, sucking plant sap or gnawing on stems, leaves and tubers, affecting the quality and yield of burdock.

Control methods: Phoxim emulsifiable concentrate or dimethoate emulsifiable concentrate can be mixed with bran and scattered in the field in the evening for trapping and killing. Phoxim emulsifiable concentrate, dimethoate emulsifiable concentrate, trichlorfon and other pesticides can also be sprayed directly, but care should be taken to rotate the pesticides to avoid developing resistance.

The above are the control methods for burdock pests and diseases. We hope this helps you. For more related knowledge, please stay tuned to us.