Control methods of common diseases of Radix scrophulariae

Radix scrophulariae is a traditional Chinese medicine, mostly born in bamboo forests, streams, jungles and grass above 1700 meters above sea level. it has the effects of clearing heat and cooling blood, nourishing yin and reducing fire, detoxifying and dispersing knots. At present, Radix scrophulariae is planted in all major provinces in China, but the planting disease will endanger its yield and quality, so let's take a look at the disease control methods.

1. Leaf blight

The main harm to the leaves, the leaves spread purple-brown spots, and then gradually spread into a round or irregular disease spot, the center of the disease spot is gray-white, the edge is raised, the disease spot will be distributed in small black spots, and in serious cases, multiple disease spots will converge and spread to the whole plant, resulting in the death of the whole plant.

Control methods: after harvest, the diseased and residual plants in the field should be thoroughly removed, burned or buried deeply, and the root buds should be soaked in Bordeaux solution to dry before sowing. The diseased leaves should be removed in time and sprayed with Bordeaux liquid and carbendazim once a week for 2-3 times in a row.

2. White silk disease

White silk disease is one of the common diseases of Radix scrophulariae, the disease site is at the base of the stem, waterlogged spots appear at the base of the stem, then gradually turn brown and rot, the aboveground parts gradually wither and die, and white silk-like long hairs will grow in the disease, and there will be sclerotia.

Control methods: planting in high dry land and rotation of Gramineae crops, soaking the root buds with pentachloronitrobenzene for 5 minutes before planting, then drying and planting. When diseased plants were found to be pulled out in time, lime powder was sprinkled into the disease hole or at the base of the plant stem to avoid the spread of the disease.

3. Wheel streak disease

The disease occurs in the leaves, and in the early stage of the disease, there are small chlorotic spots on the leaves, which gradually expand into round spots, the color becomes brown or purplish brown, the center of the spot is grayish white, concentric patterns can be seen in the center, and there are black spots on it.

Prevention and treatment methods: clean up diseased and residual plants, strengthen field management, reasonable close planting, pay attention to ventilation and permeability, spray Bordeaux solution and carbendazim at the initial stage of the disease, once every 7-10 days, 2-3 times in a row.

4. Purple spot of lily

Mainly harmful to the leaves, oval or diamond-shaped yellow-brown disease spots appeared on the leaves at the initial stage of the disease. in the environment with high humidity, the disease spots would be covered with brown or black powdery mildew layer, which would lead to leaf death in the later stage.

Prevention and treatment methods: during the period of pedicel extraction, low concentration Bordeaux solution can be sprayed once a week, 3-4 times in a row, and Dysen zinc or carbendazim can be sprayed when the disease occurs.

The above is the introduction of the prevention and control methods of common diseases of Radix scrophulariae, hope to help you, want to know more related knowledge, please pay attention to us.