Fig. 2.

Agar disc diffusion: in vitro activity of EOs against M. pachydermatis (n = 15) using agar disc diffusion. Susceptibility of M. pachydermatis is classified by the size of the zone of inhibition radius in mm (mean of duplicates): extremely sensitive, no growth at all; very sensitive, ≥20 mm; moderately sensitive, 19.9–14.0 mm; slightly sensitive, 13.9–8.0 mm. M. pachydermatis isolates classified as not susceptible (inhibition zone radius ≤7.9 mm) are not depicted (missing bars). EOs are arranged according to their effectivity in decreasing order from left to right. The median of all inhibition zone radii of the tested 15 isolates was taken for arrangement; in case of equal medians, the higher sum of all inhibition zone radii of each EO counted for higher effectivity. EO, essential oil.