Many Iowa soybean fields may be infested with soybean cyst nematode (SCN) but the infestations may not be known because SCN does not always cause obvious, above ground symptoms. Up to 40 percent yield loss can occur without the appearance of above ground symptoms.
Iowa State University
Tylka, Gregory L., "SCN Females Are Now Apparent on Soybean Roots" (2009). Integrated Crop Management News. 612.
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