Differential Susceptibility of Conyza bonariensis Biotypes to Glyphosate and ALS-Inhibiting Herbicides in Argentina
Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53010#.VK9E9cnQrzE Author(s) Eduardo Puricelli 1* , Delma Faccini 1 , Marcelo Metzler 2 , Patricia Torres 1 Affiliation(s) 1 Facultad de Ciencias Agrarias and Consejo de Investigaciones, Universidad Nacional de Rosario, Rosario, Argentina . 2 INTA Paraná, Paraná, Argentina . ABSTRACT The aim of this study was to compare control of three stages biotypes (rosette, bolting, and repro- ductive stage) of Conyza bonariensis glyphosate susceptible biotype (S) and tolerant biotype (T) to glyphosate with glyphosate and mixtures of acetolactate synthase (ALS)-inhibiting. For glyphosate, the dose-response curves confirmed that injury of the biotype T relative to biotype S was signifi- cantly lower for both rosette and bolting stages. Resistance index (RI) for this herbicide was approximately 4 for both weed stages. At bolting, for both biotypes do...