Soybean cyst nematode was first observed in North Carolina as a pest on soybeans in 1954. Within a few years, it was reported from Virginia, Tennessee, Arkansas, Missouri and Illinois. This necessitated the screening of the soybean germplasm, which lead to the discovery of the following lines carrying resistance to SCN .
Anand, S. C. and Brar, G. S.
"Research Notes: Genotype response to soybean cyst nematodes in different soil sources,"
Soybean Genetics Newsletter: Vol. 8
, Article 27.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol8/iss1/27