The inhibitory effects of E. adenophorum oil extracts on wet and dry weights of mycelia were tested in PDB medium (Table 3). Various concentrations of the oil extracts were found to be effective in inhibiting P. myriotylum to form or increase biomass. The biomass of P. myriotylum was reduced to about half of that of the control at concentrations of 60 μg/ml oil extracts. The oil extracts completely inhibited mycelial growth and biomass formation of P. myriotylum at 120 μg/ml.