The substantial costs of insect-associated viruses, ranging from honey bee decline to human, animal and plant disease, have driven investment in molecular research toward mitigation. Interest in insect viruses extends beyond these negative impacts however with biotechnological insect virus-based tools used to produce recombinant proteins, for gene therapy, vaccine production, and virus-induced gene silencing. The volume opens with a description of the insect virome and the explosion in discovery of new viral taxa. The following four chapters focus on anti-viral immunity including endogenous viral elements some of which may provide the molecular basis for long-term anti-viral immunity, the discovery of new viral suppressors of RNA interference, the role of new classes of small RNA molecules in dictating infection outcomes, and the Drosophila-dicistrovirus model as a powerful resource for insect molecular virology. The application of omics tools to insect-vectored plant viral disease, recent advances in tetravirus, polydnavirus, and baculovirus research are then described. The final chapters review progress in baculovirus expression vector and surface display technologies for use in laboratory and therapeutic applications. Written by leading experts, this work is essential reading for students and scholars of insect virology and immunology and provides a valuable resource for users of baculovirus-derived tools.