Ohio State University. Extension.

Ohio State University. Extension.

USDA. FS. Southern Research Station. CompassLive.

Callery pear (Pyrus calleryana) can be found across most of the eastern U.S. and in a few western states as well. The nonnative tree was brought to the U.S. in 1917 by a USDA employee searching for a blight-resistant species that could be bred with European pear to increase fruit production.

The most common Callery pear cultivar is the Bradford pear. In the last two decades, this near-ubiquitous landscaping tree has been identified as a serious invasive pest. A new publication examines herbicide treatments to control the spread of Callery pear. Lead author J.T. Vogt is a research scientist with the USDA Forest Service.

University of Nebraska - Lincoln. Institute of Agriculture and Natural Resources.

Australian Government. Department of Agriculture and Water Resources. National Pest and Disease Outbreaks.

City and County of Butte-Silver Bow (Montana).

Lincoln County Noxious Weed Control Board (Washington).

See also: Weed I.D. and Options for Control for more species

Tasmania Department of Natural Resources and Environment (Australia).

Wisconsin Department of Natural Resources.

Corteva Agriscience. TechLine Invasive Plant News.

Distinguishing between non-native and native buckthorn is important so that management efforts can be targeted appropriately. This article desribes and separates the two invasive buckthorns from native alderleaf buckthorn.

Indiana Department of Natural Resources. Entomology and Plant Pathology.

U.S. Government Printing Office. Electronic Code of Federal Regulations.

Alabama Department of Agriculture and Industries.

University of Nebraska - Lincoln. Cooperative Extension.

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

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

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

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

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

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

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

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

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

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

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

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