Infectious bovine keratoconjunctivitis (IBK), commonly known as pinkeye, is an economically important disease of cattle. A full understanding of the epidemiology of the chief causative pathogen, Moraxella bovis, requires that naturally occurring populations of the principal arthropod vector, the face fly (Musca autumnalis), be tracked and monitored. To date, dispersal studies of muscid flies have relied primarily on mark-release-recapture techniques, employing fluorescent powders. However, to infer population-level interactions, investigators must extrapolate data obtained from a relatively small number of captured individuals (who may suffer intemperate mortality through handling). In contrast, mark-capture techniques solve the extrapolation and handling issues to some extent, as large numbers of insects are marked directly in the field. Markers deployed this way, however, need to be inexpensive and easy to apply across the entire habitat. At the end of the last century, vertebrate-specific protein markers were developed that could be detected in diminutive quantities among large numbers of insects using an enzyme-linked immunosorbent assay (ELISA) technique. However, some large-scale studies have been hindered by the prohibitive cost of purified vertebrate IgG. Recently, investigators working in tree fruit systems in Washington State have devised a new and inexpensive immunomarking technique that utilizes cheap, readily available markers that can be sprayed using standard equipment over entire orchards. Building on this work, the utility of such a marking system is now being explored to study the dispersal of a number of important pests of livestock within the State of Washington, including Musca autumnalis. Preliminary findings are presented and discussed.