The Washington Invasive Species Council evaluated more than 700 invasive species in and around Washington to analyze which posed the greatest threat to the state’s environment, economy, and human health. The council selected 50 priority species for action in the short term.
To do the analysis, the council developed an assessment tool that evaluated each of the 50 species on their impact and ability to be prevented. The scores were plotted on the invasive species management priorities grid, which is being used as a management tool to guide council action.
It is important to note that there are many other groups doing important work with invasive species lists of their own. Some include only plants or aquatic species, some are specific to a region. The council’s statewide list represents the top threats from all categories of species – plants, animals, insects, algae, and pathogens.