Let them eat weeds.

The article discusses the biological control of invasive plants. Topics include the ecological and economic impact of the invasive Japanese knotweed, a study by entomologist Dick Shaw investigating the use of insects called psyllids as a biological control for Japanese knotweed, a brief overview of the introduction of Japanese knotweed in Europe in the 1840s by doctor and botanist Philipp von Siebold, Japanese knotweed ecology, and the risks associated with using biocontrols.