Many Iowa soybean fields may be infested with the soybean cyst nematode (SCN) but the infestations may not be known because SCN does not always cause obvious, above-ground symptoms. In fact, yield loss of up to 40 percent has been documented without above-ground symptoms occurring.
Iowa State University
Tylka, Gregory L., "Soybean Cyst Nematode Females now Apparent on Soybean Roots" (2008). Integrated Crop Management News. 821.
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