Good biosecurity policy decisions, particularly in relation to plant industry protection, are of ever increasing importance. Growth in the speed and diversity of trade, the effects of climate change and the resultant spread of pests and diseases continue to highlight this. This book contains an introduction to the issues confronting plant biosecurity policymakers and how the economic risks of invasive species can be assessed over time. It describes both probability models that show what might happen if species ‘invade’ a region and values models that help decide what management actions should be taken.As the first book of its kind focusing on a comprehensive range of policies, case studies and applications, Plant Biosecurity Policy Evaluation is perfect for biosecurity policy makers, decision-support specialists, advanced students of agricultural studies, public policy and invasive species research.