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The weed Chloris distichophylla (Lag) has been selected in areas of orchards and RR soybean in the Rio Grande do Sul- RS (Brazil), resulting of its possible tolerance to the herbicide glyphosate. This selection occurs due to intense use of this herbicide in the last years resulting in a disturb caused by the high pressure selection imposed by the herbicide occurs, resulting in selection of tolerant plants. The objective of this study was to evaluate the effectiveness of herbicides pertaining the different mechanisms of action in the control of the Chloris distichophylla and the possible tolerance of this species in three growth stages to the glyphosate herbicide. Three experiments were carried out in the College of Agronomy of the UFRGS in Porto Alegre – RS (Brazil) through the experimental design completely randomized with four replications. C. distichophylla in early growth stages was not tolerant to glyphosate. Moreover, the atrazine, glufosinate, glyphosate and paraquat herbicides showed high control when the weed had four leafs, whereas the fluazifop, imazapyr and mesotrione herbicides had showed satisfactory control.

Herbicidas no controle de Chloris distichophylla (Falso-capim-de-rhodes)