Effects of three crude organic solvent extracts of P. arundinacea (petroleum ether (A), ethyl acetate (B), and dichloromethane (C)) on the rate of M. aeruginosa growth inhibition. The data points represent the mean values (n = 4), and the error bars represent the SDs. Significant differences (P < 0.05) among different concentrations at the same sampling time are indicated by different letters (a, b, and c).