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vol.29 special issueResistance to glyphosate in Conyza spp. biotypes in western and southwestern Parana, BrazilLeaching of Picloram in ultisol under different rainfall volumes author indexsubject indexarticles search
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Planta Daninha

Print version ISSN 0100-8358

Abstract

VARGAS, L et al. Response of Euphorbia heterophylla biotypes to glyphosate rates. Planta daninha [online]. 2011, vol.29, n.spe, pp.1121-1128. ISSN 0100-8358.  https://doi.org/10.1590/S0100-83582011000500020.

Wild poinsettia is an annual cycle weed, commonly found in soybean crop in southern Brazil. It is controlled by glyphosate in genetically- modified soybean (Roundup Ready® - RR). The control of this species has not proven to be satisfactory in some places in the last years, leading to the suspicion that biotypes resistant to glyphosate have been selected. The objective this work was to evaluate, by response-dose curve, wild poinsettia biotypes with suspected resistance to glyphosate. The experiment was conducted under greenhouse conditions and the experiment was arranged in a randomized complete block design, with four replications. The treatments consisted of increased application rates of glyphosate (0, 90, 180, 360, 720, 1,080, 1,440 and 2,160 g a.e. ha-1) on five wild poinsettia biotypes, from crop soybean RR in the state of Rio Grande do Sul. Control and dry weight were evaluated. The results indicated that the wild poinsettia biotypes are susceptible to glyphosate.

Keywords : Glycine max; chemical control; weed; tolerance.

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