This book addresses recent developments in the ecology, evolution, systematics, physiology, and biodiversity of gall-inducing arthropods, with individual contributions ranging in scope from detailed descriptions to profoundly synthetic studies. One underlying theme is the various impacts of gall induction that indirectly affect insect communities on the host plant. The other important contribution is the highly intricate and dynamic interactions between galling arthropods and their uniquely specialized host plants. Included also are chapters that discuss biodiversity and distribution patterns of gall-inducing arthropods, and biological control of invasive gall-inducing arthropods. This work represents an important contribution to the knowledge of galling arthropods and their associates and to the development of robust, general principles of their ecology and evolution. As such, it is an indispensable reference source for scientists and practitioners.