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The invasion of ecosystems by nonindigenous (nonnative) species is a global economic problem. In the United States alone, rough estimates suggest that environmental damage and other losses from nonindigenous species range from tens to hundreds of billions of dollars per year (Pimentel et al.), though the true value is highly uncertain. Uncertainty also pervades attempts to identify economically efficient management strategies for any given nonindigenous invasive species. Sources of uncertainty regarding relevant state variables (eg, the biomass of an invasive plant species in a particular geographic area) include a paucity of data, measurement errors, and substantial variability in intrinsic rates of spread. Significant uncertainty, regarding the impacts of various management measures applied to any invasive species, also exists. In addition, the problem of invasive species management has characteristics that …