1. Food for protection: an introduction F. L. Wäckers and P. C. J. van Rijn; Part I. Food Provision by Plants: 2. Suitability of (extra-) floral nectar, pollen and honeydew as insect food sources F. L. Wäckers; 3. Nectar as fuel for plant protectors S. Koptur; 4. Fitness consequences of food-for-protection strategies in plants M. W. Sabelis, P. C. J. van Rijn and A. Janssen; Part II. Arthropods Feeding on Plant-Provided Food: 5. Food needs of adult parasitoids: behavioural adaptations and consequences D. M. Olson, K. Takasu and W. J. Lewis; 6. Effects of plant feeding on the performance of omnivorous 'predators' M. D. Eubanks and J. D. Styrsky; 7. Nectar and pollen feeding by adult herbivorous insects J. Romeis, E. Städler and F. L. Wäckers; Part III. Plant-Provided Food and Biological Control: 8. Impacts of plant-provided food on herbivore-carnivore dynamics P. C. J. van Rijn and M. W. Sabelis; 9. Does floral nectar improve biological control by parasitoids? G. E. Heimpel and M. A. Jervis; 10. Habitat diversification in biological control: the role of plant resources T. K. Wilkinson and D. A. Landis; 11. Providing foods for natural enemies in farming systems: balancing practicalities and theory G. M. Gurr, S. D. Wratten, J. Tylianakis, J. Kean and M. Keller.