Quantitative economic impact assessment of invasive plant pests: What does it require and when is it worth the effort?

According to the International Plant Protection Convention and the World Trade Organization Agreement on the Application of Sanitary and Phytosanitary measures, any measure against the introduction and spread of new pests must be justified by a science-based pest risk analysis. Economic impact assessments are usually carried out using a qualitative approach, based on classifying the size of impact into five categories, from “minimal” to “massive”. Whilst the qualitative approach may be adequate in many instances, it lacks transparency and demonstrable objectivity.

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