ARS | Publication request: FIELD EVALUATION OF PENAUT BREEDING LINES FOR DISEASE RESISTANCE AND YIELD

Submitted to: American Peanut Research and Education Society Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 2004
Publication Date: March 1, 2004
Citation: Dashiell, K.E., Melouk, H.A. 2003. Field evaluation of peanut breeding lines for disease resistance and yield [abstract]. In: Proceedings of the American Peanut Research and Education Society, July 8-11, 2003, Clearwater, Florida. 35:28.

Technical Abstract: The two major disease of peanut in Oklahoma are Sclerotinia blight and early leaf spot caused by Sclerotinia minor and Cercospora arachidicola respectively. Three field trials were initiated in Oklahoma during 2002 to evaluate 68 breeding lines and cultivars when subjected to four different disease environments; 1) low Sclerotinia blight and early leaf spot pressure, 2) high Sclerotinia blight and low early leaf spot pressure, 3) low Sclerotinia blight and high early leaf spot pressure; and 4) high Sclerotinia blight and early leaf spot pressure. These four different disease environments were created by applying 1) inoculum of S. minor to high Sclerotinia blight plots, 2) a block program of Bravo and Folicur to low leaf spot plots; and 3) Omega to low Sclerotinia blight plots. The ratings for defoliation caused by early leaf spot and severity of Sclerotinia blight confirmed that the methods that were used to create the four different disease environments gave the expected results. There were highly significant differences between the genotypes for disease ratings for early leaf spot, Sclerotinia blight and yield. This method of testing can evaluate breeding lines and cultivars for resistance to the two major diseases and yield in one season and should help the peanut breeding program in Oklahoma to quickly identify the best breeding lines.