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Title: Proposal for a Standard Greenhouse Method for Assessing Soybean Cyst Nematode Resistance in Soybean: SCE08 (Standardized Cyst Evaluation 2008)

item NIBLACK, TERRY - University Of Illinois
item TYLKA, GREGORY - Iowa State University
item Arelli, Prakash
item BOND, JASON - Southern Illinois University
item DIERS, BRIAN - University Of Illinois
item Donald, Patricia
item FAGHIHI, JAMAL - Purdue University
item FERRIS, VIRGINIA - Purdue University
item GALLO, KAREN - Syngenta Seeds, Inc
item HEINZ, ROBERT - University Of Missouri
item LOPEZ NICORA, HORACIO - University Of Illinois
item VON QUALEN, RALPH - Agricultural Consulting And Testing Services, Inc
item WELACKY, TOM - Agriculture And Agri-Food Canada
item WILCOX, JOHN - University Of Missouri

Submitted to: Soybean Rust Workshop
Publication Type: Abstract Only
Publication Acceptance Date: 3/20/2009
Publication Date: 3/22/2009
Citation: Niblack, T.L., Tylka, G.L., Arelli, P.R., Bond, J.P., Diers, B., Donald, P.A., Faghihi, J., Ferris, V.R., Gallo, K., Heinz, R.D., Lopez Nicora, H., Von Qualen, R., Welacky, T., Wilcox, J.A. 2009. Proposal for a Standard Greenhouse Method for Assessing Soybean Cyst Nematode Resistance in Soybean: SCE08 (Standardized Cyst Evaluation 2008). Soybean Rust Workshop. p. 78-79.

Interpretive Summary:

Technical Abstract: The soybean cyst nematode (SCN) remains the most economically important pathogen of soybean in North America. Most farmers do not sample for SCN believing instead that the use of SCN-resistant varieties is sufficient to avoid yield losses due to the nematode according to surveys conducted in Illinois and reports from nematologists. This creates problems for sustainable high-yield soybean production either continuously or in rotation because SCN populations vary widely in population densities (numbers) and virulence (ability to reproduce on resistant cultivars), both characteristics which influence soybean yield; in addition, the word “resistant” on the seed label does not necessarily mean that the cultivar is actually resistant in the traditional meaning of the word. There are currently no widely accepted standards for verifying and labeling a soybean cultivar “SCN-resistant.” Several studies have shown that many cultivars marketed as SCN-resistant actually have little or no effective resistance. During the 4th National Soybean Cyst Nematode Conference held in Tampa, FL, in March 2008, approximately 80 members of the assembly discussed and agreed upon a set of standards originally offered by members of a workshop on SCN resistance held in March 2007 in Champaign, IL, for assessing SCN resistance in released cultivars. These standards, which include the use of specific protocols and the host reaction scale proposed by Schmitt & Shannon, will allow direct comparisons of cultivars carrying SCN resistance genes. Adoption of the standards by soybean seed companies will be strictly voluntary, allowing the seed to be labeled as “according to SCE08 standard protocol.” Such labeling will permit soybean farmers to make better-informed cultivar choices.