USDA. Agricultural Research Service.

United States Department of Agriculture (USDA), Agricultural Research Service (ARS) scientists and collaborators confirmed the presence of a newly described Eriophyid mite, a potential biological control agent for the invasive tree-of-heaven, in France. The study, published in Phytoparasitica, showed that this was the first record of the mite species in the country, and the species could be a solution for managing tree-of-heaven infestations in Europe and the United States.

Washington State Noxious Weed Control Board.

Virginia Department of Forestry.

See also: Forest Health for more resources

USDA. FS. Northern Research Station. Rooted in Research.

Ailanthus altissima (tree-of-heaven) is a rapidly growing invasive tree species introduced to the United States nearly 200 years ago. Today, this species is a common invader in many forests across the nation. Scientists with the Northern Research Station have identified a unique biological control measure for managing Ailanthus—Verticillium nonalfalfae, a native soil-borne fungus. Check out this latest issue of Rooted in Research that explores how Verticillium can reduce Ailanthus populations.

University of Georgia. Center for Invasive Species and Ecosystem Health.

Provides state, county, point and GIS data. Maps can be downloaded and shared.

New Hampshire Department of Agriculture, Markets, and Food. Division of Plant Industry.

See also: New Hampshire's Prohibited Invasive Plant Fact Sheets for additional invasive trees, shrubs, vines, and herbaceous plants

Missouri Department of Conservation.

USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.

IUCN. Species Survival Commission. Invasive Species Specialist Group.

Google.

Pennsylvania State University. Cooperative Extension.

Columbia University. Center for Environmental Research and Conservation.

University of Georgia. Center for Invasive Species and Ecosystem Health.

University of Pennsylvania. The Pennsylvania Flora Project of Morris Arboretum.

See also: Invasive Plant Fact Sheets for additional invasive plants in Pennsylvania

Purdue University (Indiana). Extension.

Pennsylvania Department of Conservation and Natural Resources.

See also: Invasive Plant Fact Sheets for plant species (trees, shrubs, vines, herbs and aquatic plants) that have impacted the state's natural lands

California Invasive Plant Council.

In online book: Bossard, C.C., J.M. Randall, and M.C. Hoshovsky (Editors). 2000. Invasive Plants of California's Wildlands. University of California Press. Berkeley, CA

Ohio Invasive Plants Council.

See also: Invasive Plants of Ohio for worst invasive plant species identified in Ohio's natural areas

CAB International.

North Carolina Department of Agriculture and Consumer Services. Forest Service.

See also: Forest Health Publications for more Invasive Species Leaflets