In field soil infested with the soybean cyst nematode, Heterodera glycines Ichinohe, dibromoethane (Soilbrom(?) 90EC at 4.7 and 9.4 l/ha) and dibromochloropropane (Fumazone(?) 86 E at 9.4 l/ha) significantly increased yields over untreated checks of the resistant soybean, Glycine max L. Merr. cultivar 'Centennial'. In a companion study involving 'Centennial' growing in soil infested with the southern root-knot nematode, Meloidogyne incognita (Kofoid and White) Chitwood, no treatment significantly increased yields. However, Soilbrom 90EC at 18.7 and 37.4 l/ha had a significantly adverse effect on the levels of root-knot nematode in the soil. Early season stand and vigor ratings, which decreased with increases in treatment rates, were highly correlated with harvested yields in both studies.
