2003 Annual Report 4.What were the most significant accomplishments this past year? This report serves to document research conducted under Specific Cooperative Agreement 0500-00044-007-02S Modeling Movement and Dispersal of Tephritid Fruit Flies in Hawaii: Enhancing Areawide Control, between USDA-ARS-PBARC (Dr. Eric Jang) and Brigham Young University (Dr. Steven Peck). Additional details of research can be found in the report for the parent project 0500-00044-007-00D Areawide Integrated Pest Management of Fruit Flies in Hawaiian Fruits and Vegetables. A cooperative study between USPBARC and Brigham Young University was initiated as part of the AWPM program focused on the movement of melon fly in agro-ecosystems using mark-recapture techniques. In August and October 2002 we released 25,000 sterile laboratory reared flies marked with Rabbit IgG proteins and phosphorescing dyes. These were trapped back to determine the proportion of flies recaptured at various distances from the release point. . Analysis of flies for the presence of the dye and using ELISA for the protein has been completed for the August release. The October release is more than halfway completed. We have also started on the analyses of five experiments completed in Hilo in August on the effectiveness of the dye in various settings. In analyzing the experimental data we have found that the movement of the flies occurred within a few weeks of release with little catch-back after the initial trapping period. We are continuing with analyzing the release data and it should be completed in the next two months.