It should be noted that the diameter of the fungus growth on the treated plates were nearly the same diameters as those of the untreated controls (Fig. 1). However the treated colony appeared flatter and was considerably thinner in appearance. This observation suggests that the current assessment of essential oils fumigant efficacy against fungi by measurement of growth diameter alone is not suitable. We proposed that alternative method, such as the measurement of mycelial dried weight would be a better measure of efficacy.