Russian thistle, Salsola tragus L., (Chenopodiaceae), a troublesome weed complex in the drier regions of western North America, is native to Central Asia and widely distributed throughout the Palaearctic Region. Since 2003, several exploration and survey trips to discover new potential biological...

Yellow star thistle (YST), Centaurea solstitialis L. (Asteraceae), is a weedy annual plant, native to the Mediterranean area that infests rangelands, pastures and grasslands in the northern United States. In the search for biological control agents, an eriophyoid mite capable of significant impact...

The root-attacking moth, Bradyrrhoa gilveolella (Lepidoptera: Pyralidae), has been released as a biological control agent for Chondrilla juncea L. (Asteraceae) in Argentina and Australia; however, both efforts failed. As part of our effort to establish this insect in North America, we conducted a...