Studies in 2 fields infested with soybean cyst nematode race 4 compared yields and nematode population levels of a resistant cultivar and susceptible [soybean, Glycine max] cultivars with and without nematicide treatments. The 3 yr mean yield of resistant ''Bedford'' was 32% greater than the yields of susceptible ''Forrest'', ''Centennial'' and ''Tracy'' without nematicide treatment and 22% greater than their yields with nematicide treatment. The 3 yr mean yield of ''Bedford'' was also 44% greater than that of ''Forrest'' without nematicide treatment and 33% greater than the mean yield of ''Forrest'' with 5 nematicide treatments.