Perennial pepperweed (PPW), Lepidium latifolium L., is a mustard of central Asian origin that is invading natural and cultivated habitats in North America and is difficult to control with conventional means. Biological control of PPW is hampered by the fact that it is relatively uncommon in its...

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...