The growth of P. myriotylum treated with E. adenophorum oil extracts was observed over seven days. The results showed that mycelia growth was reduced proportionately with increasing oil extract concentration (Fig 1). The mycelial growth was complete inhibited at 100 and 120 μg/ml concentrations after seven days of incubation. A concentration of 100 μg/ml of oil extracts was therefore regarded as the minimum inhibitory concentration for P. myriotylum. The response at 100 μg/ml is the same as at 120 μg/ml and is therefore not visible in Fig 1. The inhibition ratio of oil extracts against P. myriotylum was determined on the second day of incubation. At that time, mycelial growth was significantly inhibited at concentrations of 40, 60 and 80 μg/ml oil extracts, with reduction percentages of 47.27%, 65.31% and 69.86%, respectively (Fig 2). At the same concentration of oil extracts, 9-oxo-agerophorone and 9-oxo-10, 11-dehydro- agerophorone exhibited relatively poor control efficacy with inhibition of 0% - 33.82%.