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The phytopathogenic fungi  Sclerotinia sclerotiorum  and  Rhizopus stolonifer  infect different crop plants. Essential oils have been used as an alternative to chemical control methods. Therefore, the objective of this study was to analyze the essential oil chemical composition of the stem bark of  Zanthoxylum riedelianum  (ZREO) and evaluate its antifungal potential. The ZREO obtained by hydrodistillation was analyzed using gas chromatography coupled to mass spectrometry and evaluated for  in vitro  antifungal activity. The major components identified in the chemical analysis were  E -nerolidol (67.21%), α-selinene (14.94%), and β-selinene (7.41%). The antifungal potential of ZREO against  S. sclerotiorum  and  R. stolonifer  was detected at all concentrations evaluated in a dose-dependent manner. The best results were against  R. stolonifer , with the concentration of 150 µLmL −1  inhibiting more than 80% of mycelial growth. On the basis of the current knowledge, this study describes for the first time the chemical composition and their antifungal activity.

Chemical composition and antifungal activity of Zanthoxylum riedelianum stem bark essential oil