Our study indicated that E. adenophorum oil extracts have a marked inhibitory effect on P. myriotylum. The mycelial growth was completely inhibited when exposed to oil extracts of 100μg/ml. The antifungal activity of E. adenophorum oil extracts might be attributed to the presence of sesquiterpenes, because 9-oxo-agerophorone and 9-oxo-10, 11-dehydro-agerophorone are known to be strong antifungal compounds [13, 19, 28]. But the oil extracts have greater antifungal activity, possibly due to the effect of sesquiterpenes being synergised in the presence of other compounds.