Study on the Antibacterial Activity of Ten Ultrasound Extracts from Medicinal Plants

The extracts from 10 medicinal plants were obtained through ultrasound-assisted extraction method.And then their inhibitive activities to variety of plant pathogens and the inhibition effect of different concentration were tested.The results showed that the extracts of clove,cinnamomum cassia,rhubarb,aristolochia debilis,scutellaria had notable inhibitive activities to Rhizoctonia solani Kuhn,Gloeosporium piperatum,Fusarium oxysporum f.sp.Niveum,Fusarium oxysporum Schlechtend.f.sp.Melonis,Fusarium oxysporum f.sp.Lycopersici and Fusarium oxysporium f.sp.cucumerinum.The inhibitory rate of clove and cinnamomum cassia's extracts could reach to 100%.The inhibitory rate would be affected strongly by the concentration of extracts if the extracts came from rhubarb and scutellaria,and this inhibition strengthened with the increasing of concentration under considered concentrations;but there was no obvious effect when the source plant was Aristolochia debilis.