My research interests include studies of virus–host interactions and virus–vector interactions. Our studies cover a wide range of research topics regarding virus diseases in crops and fruit trees that are economically important in China. We have been working on insect/fungus-transmitted viruses such as rice black-streaked dwarf virus and wheat yellow mosaic virus. In addition, we also devise new molecular diagnostic methods for the detection of viruses that infect fruit trees. Recently, new project work has been started to investigate cross-kingdom virus infections using insect, plant, and fungal viruses. The large distinctness of biological characteristics among organisms of different kingdoms lays out natural barriers for virus horizontal transfer, but the utilization of modern technologies and human activities has caused drastic changes in the biological and ecological systems on the earth. These could facilitate the advantageous conditions for the occurrences of cross-kingdom viral infection in the environment. Conceivably, this raises concern about the possible emergence of new animal and agricultural diseases in the future.