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Aplicações seqüenciais de flumicloracpentil para o controle de <em>Euphorbia heterophylla</em> na cultura da soja

2006; Editora da Universidade Estadual de Maringá (Eduem); Volume: 28; Issue: 1 Linguagem: Inglês

10.4025/actasciagron.v28i1.1691

1807-8621

Rubem Silvério de Oliveira, Jamil Constantin, Roberto Toledo, Luciano Hiroyuki Kajihara, Ângelo Stasieviski, João Guilherme Zanetti de Arantes, Paulo H. Pagliari, S.D. Cavalieri, Diego Gonçalves Alonso, A.C. Roso,

Pesticide and Herbicide Environmental Studies

Wild poinsettia (Euphorbia heterophylla) is one the most important weeds in soybean fields in the state of Paraná, not only for its dissemination, but also due to its natural difficulty of controlling features by herbicides and to occurrence of resistant biotypes. Facing those problems, an evaluation of the field and greenhouse trials was carried out in order to check the efficacy of postemergence sequential application of flumicloracpentil to control this weed. Sequential applications of flumicloracpentil were more efficient than a single application, promoting, at least, 86% of weed control on the 24th day after the second application of the sequential treatments. All the evaluated combinations of flumiclorac rates once sprayed at two true leaves stage, promoted adequate control of E. heterophylla. Comparing the greenhouse and the field results, it was concluded that, under field conditions, the canopy provided by the crop helps to improve the weed final control.