Abstract:The quarantine pathogenic fungi, Botryosphaeria stevensii Shoemaker, was isolated on imported Fraxinus mandshurica logs from Europe, and the survival of the pathogen was determined after oven heat treatment or carbonization drying room heat treatment of the logs. The results showed that the pathogen infected the xylem tissue of the logs. The pathogen B. stevensii could be killed totally after the temperature in the center logs reached 60℃ for six hours. The study provided an important strategy for the quarantine treatment of imported logs with B. stevensii and some other important pathogens.