Research and extension personnel in Iowa have tracked soybean cyst nematode (SCN) infestations by county since initial discovery of the nematode in Winnebago County in 1978.SCN was discovered for the first time in many different Iowa counties in the 1980s and 1990s. But by 2000, there were only nine Iowa counties in which SCN had not yet been found. The nematode was discovered in a few new Iowa counties from 2000 to 2006, but, it had still not yet been found, or at least officially confirmed, in three Iowa counties – Allamakee, Ida, and Lyon Counties – by the end of 2007.
Iowa State University
Tylka, Gregory L., "SCN Confirmed for First Time in Lyon County" (2008). Integrated Crop Management News. 889.
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