Antibacterial, antifungal and insecticidal activities of some selected medicinal plants of polygonaceae

摘要

The antibacterial, antifungal and insecticidal activities of the crude extract ofPolygonum persicaria,?Rumex hastatus,?Rumex dentatus,?Rumex nepalensis,Polygonum plebejum?and?Rheum australe?have been studied. Six bacterial species were used, of which Citrobacter frundii,?Escherichia coli,?Enterobacter aerogenesand?Staphylococcus aureus?were the most susceptible bacterial?species to crude extract with MICs 16, 5.0, 25 and 0.156 mg/ml, respectively. Among the tested fungal species?Fusarium solani,?Aspergillus flavus?and?Aspergillus niger?were?more susceptible to crude extracts with MICs 0.75, 2.15, and 1.75 μg/ml, respectively. The crude extracts of?R. dentatus?and?R. nepalensis?show significant insecticidal activity against?Sitophilus oryzae;?P. persicaria?and?P. plebejum?show significantinsecticidal activities against?Tribolium castaneum,?respectively. The above selected plants were shown by?in vitro?assays to be a potential source for natural antifungal, antibacterial and insecticidal agents.