Antimicrobial inhibition zones for essential oils against E. coli were showed in Table 1. E. coli susceptibility to 10 different essential oils, as determined by the agar diffusion method, showed that clove produced 50–60mm in diameter inhibition halos turning it, into an oil with the highest inhibitory effects. Fig. 1A shows typical inhibition halos obtained for tea tree and
clove and Fig. 1B shows typical inhibition halos obtained for clove and eucalyptus.