pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-21-1-12 Articles Evaluation of Runner Peanut Cultivars and Advanced Georgia Breeding Lines for Yield and Resistance to Late Leaf Spot Under Three Disease-Management Programs1 F. D. Smith *, T. B. Brenneman , W. D. Branch , and B. G. Mullinix 2 Post-Doctoral Associate, and Associate Professor, Department of Plant Pathology; Professor, Department of Crop and Soil Sciences; and Agricultural Research Statistician, Statistical and Computer Services, respectively, Coastal Plain Experiment Station, University of Georgia, Tifton, GA 31793-0748

1Contribution from the University of Georgia, College of Agricultural and Environmental Sciences. This research was supported by state and hatch funds with grants from the Georgia Peanut Commission. Use of trade or common names does not imply endorsement or criticism of the products by the University of Georgia, judgment of similar ones not mentioned, or registration under FIFRA.

 *Corresponding author. 1 1994 21 1 48 54 2 4 1994 American Peanut Research and Education Society 1994 American Peanut Research and Education Society Abstract

Podyield and resistance to late leaf spot, caused by Cercosporidium personatum (Berk. & M.A. Curtis) Deighton, were evaluated on nine advanced Georgia breeding lines and five cultivars of peanut (Arachis hypogaea L.): Florunner, Georgia Runner, GK-7, Southern Runner, and Sunrunner. Peanuts were grown at Tifton, GA during 1987-1988 under three leaf spot programs using diniconazole at 0.14 kg/ha with Agri-Dex® (0.5% v/v): 1) unsprayed, 2) 28-day, and 3) 14-day spray schedule. Final disease ratings (Florida 1 to 10 scale) were made approximately 1-wk prior to harvest. In unsprayed plots, Southern Runner and GaT-2566 had significantly lower leaf spot disease ratings than Florunner, GK-7, Sunrunner, and Georgia Runner. Across all fungicide treatments, yields of Georgia Runner averaged significantly higher than the four other cultivars and GaT-2566. Average yields were 5111, 4497, 4433, 4404, 4377, and 4022 kg/ha for Georgia Runner, Southern Runner, GK-7, GaT-2566, Sunrunner, and Florunner, respectively. In addition to low yield potential of GaT-2566, it was susceptible to Rhizoctonia limb rot (R. solani Kühn, anastomosis group 4). However, Georgia Runner was found to have moderate tolerance to late leaf spot and excellent yield potential.

 Key Words Fungicides; , diniconazole; , groundnut (Arachis hypogaea); , Cercosporidium personatum; , disease tolerance; , yield evaluation