Registration of ‘Georganic’ Peanut

Journal of Plant Registrations, Vol. 2, No. 1, January 2008 17 ‘G eorganic’ (Reg. No. CV-100, PI 648033) is a runner-type peanut (Arachis hypogaea L. subsp. hypogaea var. hypogaea) cultivar that was released by the USDA-ARS and the Georgia Agricultural Experiment Stations in 2006. It was developed at the University of Georgia Coastal Plain Experiment Station, Tifton, GA, and was tested under the experimental designation C11-2-39. Georganic originated from a cross of PI 203396 and the AgraTech cultivar GK 7. The original population was advanced to the F 4 using single seed descent. Individual F 4 plants were harvested and the population was subjected to selection pressure for resistance to late leaf spot [Cercosporidium personatum (Berk. & Curt.) Deighton] and spotted wilt caused by Tomato spotted wilt virus (TSWV) for the next three generations. During this same time, the population was also subjected to selection for desirable pod shape, seed size, growth habit, maturity, high yield, and grade characteristics. Georganic is a runner market-type in seed and pod size. It has a spreading runner growth habit with an erect mainstem that is prominent throughout the growing season and at harvest. It is a late maturity class peanut, with about 150 d needed for optimal maturity. It has a high level of resistance to TSWV, early (Cercosporidium arachidicola Hori), and late leaf spot. Georganic has been reported to have a much lower fi nal intensity of spotted wilt than moderately resistant cultivars Georgia Green (Branch, 1996) and C-99R (Gorbet and Shokes, 2002), and to be among the most resistant lines evaluated in fi eld tests (Culbreath et al., 1999). When tested using low seeding rates in Georgia and Florida, Georganic exhibited a fi nal intensity rating for TSWV of 11.9% which was signifi cantly (P < 0.05) less than that observed on C-99R (32.3%) or Georgia Green (57.9%) (Culbreath et al., 1999). Georganic also exhibited signifi cantly lower TSWV and signifi cantly higher yield than Georgia Green in space-planted tests conducted for two years at two locations (Culbreath et al., 2005). Mandel et al. (2002) studied mechanisms of resistance using mechanical inoculation with Registration of ‘Georganic’ Peanut