10 mg/ml 5 mg/ml 2.5 mg/ml Ciprofloxacin
Staphylococcus aureus 7 6 4 40
Bacillus subtilis 7 5 3 23
Candida 8 6 5 N.A.
Pseudomonas aeruginosa 5 4 7 35
Escherichia coli 5 4 7 37
Table 3: Antimicrobial activity of aqueous root extract of Alstonia boonei