Crambe – soybean succession on the management of Pratylenchus brachyurus and Meloidogyne javanica
ABSTRACT Crop succession system implementation, which allows the introduction of plant species that are antagonists or non-hosts for soybean pathogens during the intercrop period, is a sustainable alternative in crop systems. Thus, careful selection of succession plants is recommended to ensure that they do not allow the proliferation of nematodes, especially the soybean parasites Pratylenchus brachyurus and Meloidogyne javanica. The aim of this study was to assess P. brachyurus and M. javanica population reduction potential by growing species in succession with soybean, comparing them to crambe. Soybean seeds cv. 5909RR Nidera were sown in 18-L pots, and after fifteen days inoculations were performed in separate experiments, with 1000 specimens of P. brachyurus and 3000 eggs and possible second-stage juveniles (J2) of M. javanica. At 60 days after inoculation, the shoot of soybean plants was discarded, and the succession crops (maize cv. IPR114, bean cv. IPR Tangará, oilseed radish, black oat cv. IAPAR 61 and crambe cv. MS Brilhante) were sown. Plants were cultivated for 90 days, when the shoot was removed, and soybean cultivar was sown again and cultivated for additional 60 days. At the end of this period, plants were removed from the pots for determination of vegetative and nematological parameters for soybean. Crambe introduction in the crop succession system effectively reduced P. brachyurus population. M. javanica reproduction was lower for crambe compared to the remaining systems, but its reproductive factor was high.