Sun Xiaoan, Chinese American, native of Shouguang, Shandong, Ph.D., professor, expert in plant pathology. Head of the Plant Disease Team of the State Department of Agriculture, Florida Department of Agriculture, United States Department of Agriculture, Chief Phytopathologist; Honorary Professor at the University of Florida; Member of the Florida Agricultural Makers Advisory Group; Member of the United States Citrus Disease and Pest Risk Analysis Group; Florida Department of Agriculture Citrus Member of the advisory group of exotic pests; member of the American Society of Plant Pathology. The research direction is plant pathology, forest pathology, mycological classification, integrated pest management, plant disease detection, pathogen identification, plant quarantine regulation management, biological control, disease and pest risk analysis and control. Presided over the application for the US Department of Agriculture research fund to study the drug control of citrus yellow dragon disease with a research funding of 750,000 US dollars; from 1996 to 1999, he served as the chief phytopathologist of the American citrus canker eradication project, responsible for the disease field investigation and identification ,the study. The project has invested up to 400 million US dollars. After nearly ten years of research, it has successfully and effectively suppressed the spread of the disease. This project is a classic case of the world's only plant protection measures to cure diseases. Together with Tim Gottwald, a well-known plant disease epidemiologist from the United States Department of Agriculture, we confirmed the longest transmission distance of citrus canker bacteria in wind and rain. This result has become the only research in plant disease epidemiology in the world. The collected sample data is the largest and does not require biostatistical analysis. A model for drawing conclusions; in 2002, a new citrus canker bacterial strain was discovered and identified for the first time near Miami, Florida, setting a new world record. The discovery of this new strain has extremely important significance for the evolution of pathogenicity of citrus canker. At present, this strain has been widely used in the study of the pathogenic mechanism of citrus canker; in August 2005, it was one of the three teams that first discovered citrus yellow dragon disease on a farm in Miami, Florida. This discovery is the first record of the disease in North America; in 2013, he went to Dominican Republic to assist the country in the discovery, investigation and prevention of citrus yellow dragon disease. In just ten days, I visited all the locations of the disease, determined the cause of the disease and the current epidemic situation, and recommended that the country adopt an eradication plan in residential areas to completely eliminate the occurrence and development of the disease. So far, the island country has basically eradicated the existing diseased trees, effectively preventing the spread of the disease to commercial citrus orchards. Therefore, he was awarded the title of Florida Volunteer Person of the Year in 2013, received an interview from the governor and the Minister of Agriculture, and issued a certificate; since 2015, he has managed the team of the Plant Pathology Division of the Florida Department of Agriculture. The team has 10 formal plant pathologists, 5 long-term contract experimenters, and annual financial and scientific research funding of up to 1 million US dollars. The team is responsible for the inspection and quarantine of plant diseases in the state, issuing agricultural products import and export quarantine certificates, responsible for the pathogen identification of plant fungi, bacteria, viruses and virus-like diseases, and coordinating with the Federal Ministry of Agriculture Laboratory and Plant Inspection and Quarantine Service (PPQ) and the Buddha The joint identification, inspection, quarantine, and research project of foreign microbial pathogens between state universities. The team can effectively and timely use traditional and modern identification methods to diagnose existing and foreign harmful plant pathogens in Florida.