The disease first deteriorated from fibrous roots and roots and gradually spread to the main root. Radix Astragali, Radix Salviae Miltiorrhizae, Radix Isatidis, Radix Scutellariae, Radix Astragali, Radix Paeoniae Alba, and Codonopsis Pilosula are susceptible to the disease. Control methods
1. Use insecticides to control underground pests before sowing, and add decomposed organic fertilizers to enhance resistance to disease.
2. In the early stage of disease, 800 to 1000 times of thiophanate-methyl, carbendazim, etc. can be used to irrigate the roots, and the water can be drained immediately after the rain.
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