Historically, only a few compounds have been registered for the control of P. myriotylum in China. Mefenoxam is the most frequently used fungicide in ginger seed treatment, which is effective in controlling ginger soft rot. However, excessive use of chemical pesticides has polluted the environment and harmed human beings and animals. Moreover, excessive use has resulted in pathogen resistance to pesticides. Because of these concerns, researchers are seeking new sources of materials to control Oomycete pathogens in crop production. Plant extracts are among the sources being investigated. Plant products have received global attention because they have constituents with novel structures; they are produced naturally, are biodegradable and generally do not leave toxic residues or byproducts which contaminate the environment; and they have less potential for developing resistance to pathogenic microorganisms [6–8]. Moreover, many oil extracts from plants are classified as GRAS compounds (“generally regarded as safe”) by the widely-regarded United States Food and Drug Administration.