The Horticultural Landscape Program at the Center for Urban Ecology (CUE) assists parks by providing guidance in the design, development, and maintenance of horticultural landscapes and participates on the Region's Horticultural Advisory Review Committee (HARC). Assistance is provided in the diagnosis of landscape disorders, selection of plant material, and the design of planting environments. The Program collaborates with CUE's Integrated Pest Management (IPM), Exotic Plant Management Team (EPMT), and Soils and Geology programs. The Program engages in studies to protect and describe the urban forest by participating in city-wide efforts such as Dutch Elm disease and gypsy moth management and in surveys describing the extent, health, and ecological values of the city's urban forest utilizing the U.S. Forest Service's Urban Forest Effects Model (UFORE). The Horticultural Landscape Program collaborates with the District of Columbia's Tree and Landscape Division, the Casey Trees Endowment, and other groups interested in sustaining the urban forest of the National Capital Region and the Washington, DC metropolitan area.