4) Preliminary susceptibility testThe disc diffusion method (Acar and Goldstein, 1996)was used to screen the antimicrobial activity. Sterile disks (6mm) were impregnated with 10 µl of crude extract at con-centration of 200 µg/ml. For bacteria, the microbes wereplaced on the surface of MHA, whereas SDA was used forfungi. The extract was tested in triplicate; control discscontained 10 µl of dimethyl sulfoxide (DMSO). The stand-ard antibiotics consisted of tetracycline (30 µg/disc) forthe Gram-positive bacteria, norfloxacin (10 µg/disc) for theGram-negative bacteria, amphotericin B (10 µg/disc) for theyeast and ketoconazole (25 µg/disc) for the dermatophytes.The plates were incubated at 35oC for 18 h and 48 h for thebacteria and yeast, respectively. Plates with dermatophyteswere incubated at 30oC for 4 days and the inhibition zonediameters were then measured.