Rotations of soybean (Glycine max) with winter grown wheat (Triticum aestivum), oat (Avena sativa), and rye (Secale cereale) were compared in relation to soybean yield and population densities of Meloidogyne incognita, Paratrichodorus minor, Pratylenchus brachyurus, and Helicotylenchus spp. Soil population densities of all the nematode species in plots that had been planted to small grains in the winter did not differ from those in fallow plots in the spring. However, fall populations of Helicotylenchus spp. were more numerous in soybean plots following wheat and rye than in soybean plots following oat and fallow. Small grain rotations did not affect population densities of M. incognita juveniles, root-knot indices, plant heights or soybean yield. Meloidogyne incognita juveniles were more numerous, root-knot indices and plant heights were greater, and yields were lower in plots planted to the moderately M. incognita resistant soybean cultivar, Coker 488, than in plots planted to the
