Inhibition zones were determined against four selected bacterial strains according to the disc diffusion method recommended by CLSI. The bacterial suspension after one night incubation was adjusted to 108 CFU/ml by MHB and 100 mL of suspension was spread on the MHA solid media plates. Filter paper discs (6 mm in diameter) were individually impregnated with 10 ml essential oils and then placed on the incubated plates. The plates were incubated at 37 C for 24 h. The DIZ values were measured with a calliper in mm. Streptomycin (10mg/disc) was used as the positive control. All the tests were repeated in triplicate.