Abstract Inhibitory impact of Artemisia herba-alba extract on Klisinema persicum growth was investigated. This study looked at the effects different concentrations A. extracts and antioxidant enzyme (superoxide dismutase Catalase) activity K. in order to determine optimal dose range for good anti-algal action. Concentrations were used (2.5,5, 10, 20, 40,80 160) mg. L -1 as well control. Results...