Abstract: The field tests showed that covering Artemisia annua L.on the Panax notoginseng’s soil surface can promote plant growth and meanwhile inhibit the occurrence of root-rot disease of P.notoginseng with preventive effect even up to 76.6%.To unveil the effect of water soluble extract of A.annua leaves on the growth of Fusarium oxysporum,a well-known pathogenic fungus of P.notoginseng,the colony diameter,spore yields,hypha dry weight and fusaric acid content were measured.It was found that the mycelium growth,spore yields,hypha dry weight and fusaric acid content significantly decreased in a dose dependent manner.In addition,the content of fusaric acid in medium was found to be positively correlated with the injury level of plant.The present study would lend supports for both ecological control and development of new pesticides of P.notoginseng.

Key words: Artemisia annua, Panax notoginseng, Fusarium oxysporum, water soluble extract, root-rot disease