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ARS Home » Midwest Area » Urbana, Illinois » Soybean/maize Germplasm, Pathology, and Genetics Research » Research » Publications at this Location » Publication #138848
Title: THE RESISTANCE IN ALL SCN-RESISTANT VARIETIES IS NOT THE SAME: THE UNTOLD STORY

Author
item DIERS, BRIAN - UNIV OF ILLINOIS
item Noel, Gregory

Submitted to: Agronomy Day Program
Publication Type: Proceedings
Publication Acceptance Date: 8/22/2002
Publication Date: 8/22/2002
Citation: DIERS, B.W., NOEL, G.R. 2002. The resistance in all SCN-resistant varieties is not the same: The untold story.

Interpretive Summary: Soybean cyst nematode (SCN), Heterodera glycines, is a serious pest of soybean throughout soybean production areas in the United States, causing an estimated annual production loss of 80 million bushels or $400 million. SCN has great genetic variability in it's ability to attack the various sources of resistance used in soybean breeding programs to develop varieties with resistance to SCN. Many soybean farmers have been experiencing problems in controlling SCN and have thought the difficulty was do to "breakdown" of resistance caused by mutation of the nematode to more aggressive strains. The presentation reported herein is based on research to determine the level of resistance in commercial, proprietary soybean varieties planted throughout the Midwest. The research showed that 80% of the varieties have good to excellent resistance, but 20% have inadequate resistance. Thus, some of the difficulties experienced by farmers in controlling SCN probably are due to insufficient levels of resistance in some commercial varieties. Armed with the information developed by this research, soybean farmers will now be able to plant varieties with high levels of resistance to SCN and will maximize production and profitability of their farms.

Technical Abstract: None.