Control methods of common diseases and insect pests in Radix Isatidis

Isatis root, also known as indigo root, indigo root, is a well-known Chinese herbal medicine, it has the effect of clearing heat and detoxifying, cooling blood and benefiting throat, mainly used to prevent cold and fever. However, during the planting period of Isatis root, it will suffer from many diseases and insect pests, affecting its growth and yield, causing economic losses to farmers. The following small series introduces the prevention and control methods of common diseases and insect pests of Isatis root.

1. Downy mildew

The disease began to occur on the leaves at the base of the stem, and gradually spread upward. Gray frost mold appeared on the back of the leaves when the disease occurred, and there was no obvious disease spot on the leaves. The disease spots are uneven. With the further aggravation of the disease, the disease spots become chlorotic round spots, gradually become brown withered spots, and when the disease is serious, the withered spots become large spots, and finally lead to leaf dryness and death.

Control methods: clear the field when harvesting, reduce the source of overwintering disease, strengthen field management, reasonable close planting, pay attention to ventilation and light transmission, spray bordeaux mixture or zinc solution when disease occurs, so as to avoid the spread of disease.

2. Root rot

The root system of isatis root was damaged firstly, the fibrous root and the root tip of taproot were damaged firstly, the diseased part of root system was black brown, and the vascular bundle of root system was brown. In the later stage of the disease, the whole root system decays, and the above-ground plants gradually wither due to lack of nutrients and water until they die.

Control methods: reasonable rotation, selection of good drainage soil planting, when the disease can be used in the fungus or thiophanate-methyl irrigation control, the effect is better.

3. Sclerotium disease

Sclerotinia sclerotiorum can harm the whole plant, roots, stems, leaves, pods and other parts can be affected, stem infected surface rot, stem rupture into a mess, covered with hyphae, stem inside and outside there are black rat dung sclerotia. When the leaves are infected, they appear water-stained green-brown spots, which later lead to leaf decay, leaving only veins.

Control methods: rice-drought rotation, can effectively reduce the bacteria, in rainy season to pay attention to drainage, reduce field humidity, reasonable close planting, enhance ventilation and light transmission, when the disease can be used 65% zinc 600 times spray control.

4. Aphids

Aphids are common pests of Radix Isatidis. After being damaged by aphids, Radix Isatidis will lose water, shrink, twist and turn yellow seriously, which will seriously affect the yield and medicinal value.

Control methods: when planting, keep away from cruciferous crops, reduce weeds and previous crop residues, reduce insect sources, and spray cypermethrin with high efficiency and low toxicity when the disease occurs.

The above is the prevention and control methods of common diseases and insect pests of Radix Isatidis. I hope to help you. If you want to know more about relevant knowledge, please pay attention to us.