Technical Abstract: TifGP-1 (Reg. No. , PI ) is a runner-type peanut (Arachis hypogaea L. subsp. hypogaea var. hypogaea) germplasm line that was released by the USDA-ARS and the Georgia Agricultural Experiment Stations in 2006. This material was released based on resistance to both tomato spotted wilt (caused by Tomato spotted wilt virus, TSWV) and the peanut root-knot nematode [Meloidogyne arenaria (Neal) Chitwood]. It was developed at the University of Georgia Coastal Plain Experiment Station, Tifton, GA, and was tested under the experimental designation C209-6-13. Segregating interspecific material that originated from a cross of A. hypogaea (PI 261942) with A. cardenasii (GKP 10017, PI 262141) was obtained from North Carolina State University. TifGP-1 originated from a cross of this segregating interspecific material with the cultivar >MARC I= (Gorbet et al., 1992). The population was advanced to the F4 using single seed descent. Individual F4 plants were harvested. The population was then subjected to selection pressure for resistance to Meloidogyne arenaria using a greenhouse screening technique (Holbook et al., 1983), and for resistance to TSWV using a field screening technique (Culbreath et al., 1997). TifGP-1 is a small runner market-type in seed and pod size. Based on standard peanut plant descriptors (Pittman, 1995), it is a medium size with a bunch growth habit and a mainstem that is not apparent during the growing season or at harvest. It is a medium maturity class peanut, with about 135 days needed for optimal maturity. TifGP-1 is the first peanut germplasm reported to have resistance to both TSWV and the peanut root-knot nematode, and the first interspecific germplasm reported to have resistance to TSWV. In field and greenhouse studies, Holbrook et al (2003) observed that TifGP-1 exhibited significant reduction in nematode reproduction in comparison to the nematode susceptible cultivar >Georgia Green= (Branch, 1996), and significant reduction in incidence of TSWV in comparison to the TSWV susceptible cultivar >COAN= (Simpson and Starr, 2001). Based on the pedigree and the phenotypic observations, we believe that TifGP-1 contains some unique genes for resistance to these two pathogens (Holbrook et al., 2003). Seed of TifGP-1 has been deposited in the National Plant Germplasm System, where it will be available for research purposes, including development and commercialization of new cultivars. Appropriate recognition is requested if this release contributes to the development of a new breeding line or cultivar.