Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: June 13, 2006
Publication Date: October 2, 2006
Citation: Porter, L., Hoheisel, G., Coffman, V.A. 2006. Identification of novel sources of white mold resistance in pea. Phytopathology. 2006 Pacific Division Meeting Abstracts June 13-16, 2006 - Boise, Idaho. Published online: http://www.apsnet.org/meetings/div/pc06abs.asp. Technical Abstract: White mold, caused by Sclerotinia sclerotiorum, is a common foliar pathogen of many legumes including peas. White mold often causes serious disease in irrigated and dryland peas in the Pacific Northwest and is considered a serious potential threat to the expanding pea production in the Midwest of the United States. Due to poor economic returns to pea growers, expensive foliar fungicides used to manage white mold are cost prohibiting. There are currently no known sources of white mold resistance in peas. Therefore, the identification of novel sources of resistance to white mold from pea accessions taken from the Pisum core collection located at the USDA-ARS, Regional Plant Introduction Station (RPIS), Pullman, WA were screened for resistance to white mold. Resistance was based on lesion expansion, when plants were inoculated and maintained at 100% RH at 18 to 21ºC, for three days. Of 487 pea accessions assessed, 1, 4, 39, 276, 143, and 24 accessions had lesion expansions of, 0 to 0.5, 0.6 to 1.0, 1.1 to 2.0, 2.1 to 5, 5.1 to 8, and 8 to 11 cm, respectively. Novel sources of resistance to white mold were identified.