Preface

What is the problem?
1. Controlling biological pollution
2. An ecological explosion in slow motion
3. Exotic pests: past, present and future

Weeds, diseases and other pests
4. Exotic weeds: expensive and out of control
5. Plant disease on the move
6. Plant-parasitic nematodes which are exotic pests

What is to be done?
7. Meeting the threat: risk assessment and quarantine
8. Assessing exotic threats to forest resources
9. Political and economic barriers to scientifically based decisions
10. Fighting back!