What are the control methods for southern blight of Sophora flavescens?

Sophora flavescens (scientific name: Sophora flavescens var. flavescens) is a variety of the genus Sophora in the Fabaceae family. It is distributed in Russia, Japan, India, Korea, and mainland China, among other places, growing in areas at an altitude of 1,500 m, mostly on hillsides, sandy grassy slopes, in shrub forests and near fields. Sophora flavescens is a traditional Chinese medicine name. It is the dried root of the leguminous plant Sophora flavescens, harvested in spring and autumn, with the root head and small branch roots removed, washed, and dried, or sliced fresh and dried. It is bitter, cold. It has the effects of clearing heat and drying dampness, killing insects, and promoting urination. It is used for heat dysentery, bloody stool, jaundice with urinary retention, red and white vaginal discharge, genital swelling and itching, eczema, damp sores, skin itching, scabies and leprosy, and externally for trichomonal vaginitis.

If southern blight of Sophora flavescens is not controlled in time, it will bring huge losses to Sophora flavescens cultivation, so how should southern blight of Sophora flavescens be controlled?

What is southern blight?

Southern blight, also known as sclerotial root rot and sclerotial seedling blight, harms the root crown of seedlings and young trees. The disease can harm many kinds of plants, mainly harming oil tea, tung tree, catalpa, citrus, apple, phoenix tree, paulownia, walnut, masson pine and many other tree species, and can also cause disease in many crops such as peanut and Welsh onion. The disease is mainly distributed in southern and southwestern Henan Province.

Southern blight of Sophora flavescens mainly harms the roots of Sophora flavescens. In the early stage of the disease, white silky sclerotia appear from the stem base to near the main root in the surface soil layer, the roots suffer from wet rot, and in the later stage the branches and leaves of the aboveground part of the plant wilt and die. When the weather is humid, white mycelium and mouse-dropping-like sclerotia are often present at the stem base of diseased plants. In years with severe occurrence, the yield of Salvia miltiorrhiza drops sharply.

How to control southern blight of Sophora flavescens:

For chemical control, you may choose 50% carbendazim wettable powder at 800 times dilution, or 75% chlorothalonil wettable powder at 1000 times dilution, or Trichoderma harzianum at 600 times dilution for root drenching.