These proceedings contain the full-length papers and abstracts of papers presented at the symposium. Subjects covered include: ecology and modelling in biological control of weeds; benefits, risks and cost analysis of biological weed control; target and biological control agent selection; pre-release specificity and efficacy testing; regulations and public awareness; evolutionary processes; opportunities and constraints for the biological control of weeds in Europe; release activities and post-release evaluations; and management specifics, integration, restoration and implementation.