Abstract: The fruit tree Myrica rubra (called yangmei) is seriously damaged by blight disease in Zhejiang Province. The present study was conducted to investigate the effect of blight disease on growth and development of mycorrhizal fungi. The result indicated that the fiber content of infected tree was seriously damaged and resulted in the breakdown of mycorrhizal mycelia tissue on infected tree. The fungal spore cells were broken that caused a leakage of spore mass compared to the whole and intact spores in the control. Furthermore， there was low colonizing capability of spore found on infected tree rhizosphere compared to spores found on healthy tree. Our results indicated that the blight disease inhibited the mycorrhizal fungal growth and development， though the exact interaction between two fungi was unknown， which should be investigated later.

Key words: Myrica rubra, blight disease, mycorrhizal fungi