The biocontrol efficacy of T. gamsii YIM PH30019 was estimated in vitro with detached healthy notoginseng roots. YIM PH30019, pathogenic fungi, and the mixture of YIM PH30019 and test pathogenic fungus were inoculated with a healthy root in a pot containing 400 g soil autoclaved at 121◦C for 60 min. Four replicates were set for each treatment. The pots were kept in a shed similar to the field-planting condition. Spores of T. gamsii and test pathogenic fungi were collected from PDA plates. Ten milliliter spores (1.0*1010) of T. gamsii YIM PH30019, pathogenic fungus, and the mixture of T. gamsii YIM PH30019 and pathogenic fungus were added into the autoclaved soil and mixed together thoroughly. The surface-sterilized healthy notoginseng roots were laid into the soil at a depth of 5 cm. Roots treated with pathogenic fungus or T. gamsii YIM PH30019 were set as controls. The biocontrol efficacy of PH30019 and virulence of test phytopathogens were checked every week for 1 mo (Fig. 1 in Support Information).