Attack by the root-lesion-nematode Pratylenchus brachyurus is, presently, the cause of extensive crop losses in soybean yields in Brazil. Rotation with maize has been recommended for P. brachyurus management, however only a few resistant maize hybrids are currently available for use in such schemes. Two experiments were carried out in greenhouse conditions in order to evaluate the resistance of 12 maize hybrids to P. brachyurus. None of them was entirely resistant to P. brachyurus, but P30K75, DKB-330, AG-7088, DKB-350 and AG-7000 were moderately resistant. Thus, the hybrid P30K75, usually considered resistant to P. brachyurus, should be reclassified as moderately resistant. Two additional experiments were also performed: one was assessed the effect of two experimental periods (70 and 107 days after inoculation) on nematode reproduction and has indicated that the longer period allowed higher reproduction of P. brachyurus and should be preferred in evaluations of maize resistance to P. brachyurus; and the other showed that P. brachyurus' reproduction was lower in pearl millet 'ADR-300' than in maize hybrids and that, therefore, this pearl millet culvivar is more adequate for rotation schemes with soybean in P. brachyurus management than maize.
Pennisetum glaucum; Zea mays; management; root lesion nematode; soybean
