The nematicidal effect of crambe, Crambe abyssinica Hochst, has not yet been investigated. Crambe cake is a byproduct of the extraction of oil from seeds of crambe. The present study aimed to investigate the effect of crambe cake on Meloidogyne javanica and Pratylenchus brachyurus. Soybean seedlings were transplanted and inoculated with M. javanica or P. brachyurus. Sixty (60) days later, the aerial part was discarded, and the treatments (0, 0.5, 1, 2.5, and 5% of crambe cake per pot (% weight/weight) were applied, and soybean was sown again. Sixty days after seed germination, vegetative and nematological parameters were assessed. For each nematode, the experiment was conducted in two different periods. The treatment with 5% of crambe cake inhibited seed germination in all the experiments. Higher doses favored plant growth. Crambe cake effectively controlled M. javanica in one of the experiments when 1% was applied per pot containing 2 L of soil, and the increase in crambe cake doses promoted the control of P. brachyurus in both experiments.
