1 Vitellogenesis in Mosquitoes.- Production of Yolk Protein Precursors in the Fat Body.- Selective Endocytosis of Yolk Protein Precursors in Mosquito Oocytes.- Conclusions and Future Directions.- References.- 2 Radioisotopes in Vector Research.- Application of Suitable Radioisotopes.- Ingestion of Radiotracers with Food.- Pathways of Radioisotope Uptake and Elimination.- The Problem of Egestion by Regurgitation.- Transfer of Egested (Regurgitated) Food to the Next Host.- Transmission of Disease Agents Via Egestion (Regurgitation).- Radioimmunoassay Techniques and Application in Disease Vector Research.- References.- 3 Aegyptianella: An Appraisal of Species, Systematics, Avian Hosts, Distribution, and Developmental Biology in Vertebrates and Vectors and Epidemiology.- Aegyptianella spp. Described to Date.- On the Systematic Position of A. pullorum.- On the Avian Host-Spectrum of Aegyptianella.- Occurrence and Distribution of A. pullorum in Domestic Poultry.- Epidemiology of A. pullorum-Inkction.- Conclusions.- References.- 4 Immunity in Haematophagous Insect Vectors of Parasitic Infection.- Innate Immunity and Infection Acquired Immunity.- Vector/Parasite Systems.- Initial Barriers to Infection.- Haemocoel Mediated Immunity.- Humoral Immunity.- Haemocytes of Vectors.- Acquired Immunity-Homologous and Heterologous Resistance to Reinfection.- Conclusions and Applications.- References.- 5 Role of Circulifer/Neoaliturus in the Transmission of Plant Pathogens.- Circulifer/Neoaliturus Species.- The Beet Curly Top Virus and its Transmission.- The Stubborn Disease Organism and its Transmission with Circulifer Species.- The Beet Leafhopper-Transmitted Virescence Disease.- Safflower Phyllody and the Vector Neoaliturus Fenestratus.- Other Suspected Leafhopper-Transmitted Pathogensin the Middle East.- Concluding Remarks.- Summary.- References.- 6 Thrips-Tomato Spotted Wilt Virus Interactions: Morphological, Behavioral and Cellular Components Influencing Thrips Transmission.- Thrips Anatomy, Morphology and Behavior.- Thrips Acquisition and Transmission of TSWV.- Conclusion.- Addendum.- References.- 7 Mealybug Wilt of Pineapple.- Pineapple: Characteristics and Worldwide Significance.- Mealybug Wilt of Pineapple.- Identification of a Pineapple Closterovirus (PCV).- Discussion.- Future Directions.- References.- 8 Ilarvirus Vectors.- Ilarvirus Properties and Subgroups.- Vectors of Subgroup.- Vectors of Subgroup.- Vectors of Subgroups 3 and.- Vectors of Other Ilarviruses.- Concluding Comments.- References.- 9 Immunoelectron Microscopy of Plant Viruses and Mycoplasmas.- Conclusion.- References.- 10 Aphid-borne Rhabdoviruses—Relationships with Their Vectors.- The Viruses.- Aphids as Alternate Hosts for Rhabdoviruses.- Ultrastructure Studies of Infected Aphids.- Transmission Parameters.- Virus Assay.- Vector Range.- Plant Host Range.- Impact on Vectors.- CO2 Sensitivity.- Epidemiology.- Conclusions.- References.