pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-20-2-4 Articles Spotted Wilt Apparent Disease Progress in the Component Lines of Southern Runner Cultivar A. K. Culbreath *, 1, J. W. Todd 2, D. W. Gorbet 3, and J. W. Demski 4 Department of Plant Pathology Department of Entomology, University of Georgia, Coastal Plain Experiment Station, Tifton, GA 31793-0748 Agronomy Department, University of Florida, IFAS, Marianna, FL 32446 Department of Plant Pathology, University of Georgia, Georgia Experiment Station, Griffin, GA 30223 *Corresponding author. 7 1993 20 2 81 84 5 6 1993 American Peanut Research and Education Society 1993 American Peanut Research and Education Society Abstract

The apparent disease progress of spotted wilt, caused by tomato spotted wilt virus, was monitored in the three component lines of Southern Runner peanut (Arachis hypogaea L.), and in cultivars Southern Runner, Florunner and GK-7 in the field in 1990-1992. In all three years, final incidence and area under the disease progress curves were similar among Southern Runner and all three component lines. Final incidence of spotted wilt in Southern Runner and all component lines was less than for Florunner in all three years. AUDPC values were lower in Southern Runner and two of the three component lines than in Florunner. Incidence and AUDPC of spotted wilt in GK-7 was intermediate between Florunner and Southern Runner and its individual components. Disease increase was linear in all component lines and cultivars. Rate of disease progress was similar among Southern Runner and the three component lines. Disease progressed more slowly in Southern Runner and the component lines than in Florunner.

 Key Words Resistance; , epidemiology; , TSWV