Montana State University.
The Center for Invasive Species Management closed in 2015. Archives of relevant materials are available here.
Connecticut Agricultural Experiment Station. Plant Disease Information Office.
University of Connecticut. Department of Plant Science and Landscape Architecture.
Louisiana State University Agricultural Center. Research and Extension.
University of Connecticut. Connecticut Invasive Plant Working Group.
University of New Hampshire. Cooperative Extension; New Hampshire Department of Agriculture, Markets & Food.
University of New Hampshire. Cooperative Extension.
Montana Fish, Wildlife, and Parks.