Current Research Projects Research is conducted on citrus epidemiology/pathology to provide fundamental knowledge on epidemiology, etiology, and host-parasite interactions of exotic and domestic bacterial, viral, and fungal foliar and fruit pathogens of citrus. The long-range goal is the development of innovative disease control strategies based on sound biological and epidemiological evaluation of disease pathosystems. International cooperative research programs have been established in Argentina, China, Taiwan, Philippines, Mexico, Brazil, Costa Rica, Dominican Republic, Scotland, France, (Europe plus islands of Corsica and Reunion), Spain, Puerto Rico, and Trinidad to study the epidemiology, spread and develop control strategies for Asiatic citrus canker, citrus bacterial spot, citrus huanglongbing (greening), citrus tristeza (CTV), citrus variegated chlorosis, and plum pox virus (sharka) of Prunus sp.