Section I. Introduction -- 1. General concepts in the ecology of invertebrate diseases -- 2. Methods for studying the ecology of invertebrate diseases and pathogens -- Section II. The Basics of Invertebrate Pathogen Ecology -- 3. The pathogen population -- 4. The host population -- 5. Abiotic factors -- 6. The biotic environment -- Section III. Ecology of Pathogen Groups -- 7. Viruses -- 8. Bacteria -- 9. Fungi -- 10. Microsporidia -- 11. Nematodes -- 12. Modeling insect epizootics and their population-level consequences -- 13. Leveraging the ecology of invertebrate pathogens in micrbial control -- 14. Prevention and management of diseases in terrestrial invertebrates -- 15. Prevention and management of infectious diseases in aquatic invertebrates -- 16. Ecology of emerging infectious diseases of invertebrates -- 17. Conclusions and future directions.