Researchers found that treating soil with a combination of dazomet fumigant and azoxystrobin fungicide effectively eliminated violet root rot disease in Codonopsis tangshen plants grown repeatedly on the same land. The treatment worked by killing harmful disease-causing fungi while promoting beneficial soil bacteria that protect plant roots. This approach increased crop yield by 5-6 fold while maintaining important medicinal compounds in the plant roots, offering farmers a sustainable solution to a serious agricultural problem.