Abstract: To select suitable plant sources for the green control of Panax notoginseng root rot and provide a new feasible way for ecological planting, we used Fusarium oxysporum,Fusarium solani,Cylindrocarpon destructans, and Alternaria panax as the targeted root-rot pathogenic fungi of Panax notoginseng. The antifungal effect, antifungal time, and virulence value of various plant-derived extracts against pathogenic fungi were analyzed by plate confrontation method. The allelopathic response index (RI) was calculated to investigate the allelopathic effects on the germination and emergence of P. notoginseng seeds and seedling growth. The extract of Eupatorium coelestinum had the highest antifungal rate against F. oxysporum and C. destructans, which were 64% and 90%, respectively, while the inhibition time was the longest. The extract of Artemisia lavandulaefoliahad a significant inhibitory effect on F. oxysporum and C. destructans, and caused A. panax to fall near zero growth within seven days. The antifungal rates of Artemisia annua, Chenopodium ambrosioides, Cirsium japonicum, and Euphorbia jolkinii extracts for the four pathogens were above 50%. The toxic effects of E. coelestinum, A. annua,and A. lavandulaefolia were all higher than that of carbendazim (P<0.05). Plant derived extracts showed a “low boosting-high inhibition” concentration effect on seed germination of Panax notoginseng, with significantlypromoting effect of A. annua, E. coelestinum andA. lavandulaefolia at low concentration (2.5mg·mL^-1). Plant-derived extracts had positive on seedling yield and plant height, with A. annua and C. japonicumbeing the most significant. Therefore, extracts of E. coelestinum, A. annua,and A. lavandulaefoliahave the potential of being applied in green control of Panax notoginseng root rot.

Key words: plant-derived extracts, Panax notoginseng root rot, antifungal effect, allelopathy, ecological planting.