Soybean cyst nematode (SCN) is a major pest of soybeans and other legumes. This pest has been an issue for Delaware growers for many years and continues to spread to other regions. Figure 1 shows the most recent SCN distribution map for the United States. Compare this with the distribution in 2008 (Figure 2). This map was constructed by the SCN working group.
Figure 1. SCN distribution as of January 2014.
Figure 2. SCN distribution 2008.
Source : udel.edu