Book excerpt: This book is based on presentations at the workshop ("Integrative approaches for the investigation of root herbivory in agricultural and natural systems"), providing an overview of root-feeding invertebrates. It aims to bring a range of viewpoints and approaches 'under one roof', covering everything from food web ecology to the potential impacts of climate change on root feeders. In this book, 23 internationally renowned researchers working in the field of root herbivory were invited to participate in this focused edited volume. Their work brings together current knowledge relating to belowground herbivory in 11 chapters, across a spectrum of areas and predicts the future challenges and directions for root herbivory research. It concentrates on root-feeding invertebrates (nematodes, and particularly insects) as this is the most widespread type of root herbivore and the focus of most contemporary research in root herbivory.