The soybean cyst nematode (SCN) is a very wide-spread and serious pest of soybeans in Iowa and the other soybean-producing states of the Midwest. The nematode can survive in the soil without a host for up to 10 years, and it often causes significant yield loss without causing noticeable symptoms on the aboveground parts of the crop. An effective way to manage SCN is by growing corn, a nonhost crop, in rotation with SCN-resistant soybean varieties.