Table 2.
Antimicrobial activities of the essential oils of Conyza canadensis using agar disc diffusion method.a
| Microorganisms | Essential oil | Antibiotics | |||
|---|---|---|---|---|---|
| Herbs (8 μg) | Roots (8 μg) | Piperacillin/tazobactam (100/10 μg) | Fluconazole (25 μg) | Voriconazole (1 μg) | |
| Enterococcus faecalis | NA | NA | 25 | NT | ND |
| Staphylococcus aureus | NA | NA | 30 | NT | ND |
| Streptococcus pyogenes | NA | NA | 35 | NT | ND |
| Escherichia coli | NA | NA | 25 | NT | ND |
| Pseudomonas aeruginosa | NA | NA | 30 | NT | ND |
| Candida albicans | 15 | 20 | NT | 30 | 40 |
| Candida glabrata | 25 | 25 | NT | NA | NA |
| Candida kefyr | 7 | 9 | NT | 50 | 50 |
| Candida parapsilosis | 13 | 18 | NT | 28 | 30 |
| Candida tropicalis | 15 | 18 | NT | 18 | 12 |
| Cryptococcus neoformans | 40 | 32 | NT | 25 | 35 |
| Rhodotorula glutinis | 13 | 18 | NT | 30 | 30 |
| Trichophyton interdigitalis | 40 | 40 | NT | NA | > 40 |
| Aspergillus fumigatus | NA | NA | NT | NA | 18 |
aDiameter of inhibition zone (mm) including diameter of the paper disc (6 mm).
NA: not active.
NT: not tested.