Litsea cubeba extraction oil(LEO), a kind of plant extracts, was of excellent antioxidative capacity and antibacterial properties. Saprolegnia was a fungal pathogen which caused some severe aquatic diseases. So the inhibition of it played a core role in the study on Saprolegnia in China. Saprolegnia monoica Pringsh was an important species,which had been found in the northeast, north, south-east coast and the inland provinces of China. Saprolegnia monoica adapted to a wide range of temperatures, almost coul...