Abstract: Cryptomeria fortunei is one of the rare timber materials， with highly ornamental value. Unfortunately， its population in Linan city， Zhejiang Province， China， declined sharply recently， which was mainly due to gall disease. Our study may present a promising strategy to reduce the damage of gall disease by identifying this disease using fourier transform infrared （FTIR）. The result demonstrated that 2 85206 cm-1 was observed in FTIR of the infected trunk， but not in FTIR of uninfected trunk. In contrast， 3 74275，1 42555，1 26758，1 15993and 89875 cm-1 were specific to the uninfected trunk of C.fortunei. Furthermore， the peak at 2 85220 cm-1 appeared only in uninfected leaves of C.fortunei. Therefore， these differential peaks between infected and uninfected tissues could be used as the biomarker to identify the gall disease， which indicated that FTIR spectra may provide an alternative method for rapid identification of gall disease of C.fortunei.

Key words: Cryptomeria forunei, gall disease, specific peak, FTIR