Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: April 15, 2006
Publication Date: August 1, 2006
Citation: Melouk, H.A., Pittman, R.N. 2006. Sources of resistance to Sclerotinia minor in peanut [abstract]. Phytopathology. 96:S77. Available: http://www.apsnet.org/meetings/2006/abstracts/a06ma492.htm. Technical Abstract: Sclerotinia blight disease of peanut (Arachis hypogaea L.) caused by Sclerotinia minor negatively impacts peanut production in the states of OK, TX, VA, and NC. Seventeen genotypes were planted at Ft. Cobb, OK, in 2003, 2004, and 2005. Sclerotial density of S. minor was 1-2 viable sclerotia/100 g of soil. The study had four replications in a randomized complete block design, with each plot consisting of two, 5-m rows, with a row spacing of 0.91 m. Disease incidence (%) was read at about 120 days post planting. Over 2003-2005, Grif 13826 (a Pl of Ecuadorian origin) and Grif 14057 (a Pl of Guatemalan origin), had a disease incidence of 6.3 and 5.2%, respectively, which were significantly different (P=0.05) from the Sclerotinia-resistant cv. Southwest Runner that had a disease incidence of 12.3%. Based on these findings, these two peanut introductions were selected as parental lines to transfer a high level of increased Sclerotinia resistance into high oleic acid advanced breeding lines.