Soybean cyst nematode (SCN) is widespread in Iowa. The nematode reproduces quickly (completes several life cycles or generations per season), survives in the soil for 10 years or more in the absence of a soybean crop, and can cause substantial yield losses, particularly in dry years.
Plant Pathology and Microbiology
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Gregory L. Tylka and Mark P. Mullaney. "Soybean cyst nematode-resistant soybean varieties for Iowa" (2016)
Available at: http://works.bepress.com/gregory-tylka/159/