The interactive effects between Pratylenchus brachyurus and Meloidogynejavanica on soybean cv. Crista-Una were evaluated. Ten treatments (noninoculated check; single inoculations of P. brachyurus at three inoculum levels; single inoculations of M. javanica at two inoculum levels; and mixed inoculations of both species at four different combinations) were stablished, with five replications, in a randomized block design. Sixty days after the inoculations, fresh root weight and top dry weight values were determined, as well as the final population of the nematodes. Antagonism between the species was observed in the mixed infestations, being generally P. brachyurus more adversely affected. Significant reduction hi plant growth only occurred with single P. brachyurus inoculations of 5,000 or 10,000 nematodes per plant.
soja; interactions; Pratylenchus brachyurus; Meloidogyne javanica; soybean