?To survey wild oat (Avena ludoviciana Dur.) and little seed canarygrass P. minor biotypes resistant to clodinafop-propargyl herbicide in wheat fields of Kordkuy, Golestan province of Iran, an experiment was conducted in 2013. Fourty-four and 85 suspected resistance biotypes of A. ludoviciana and of P. minor, respectively, were collected from wheat fields using a grid map of Kordkuy. One susceptible biotype was also collected for each species from an area to which herbcides had never been applied. Experiments included determining discriminating concentrations of herbicides, screening the suspected biotypes with these concentrations and concentration-response bioassays for resistant biotypes. According to the results of a seed bioassay, the discriminating concentrations for Avena ludoviciana and P. minor  were estimated to be about 0.16 mg ai L-1 and 8 mg ai L-1, respectively. The screening assays using discriminating concentrations indicated that 15 and 12 biotypes of Avena ludoviciana and P. minor, respectively, were resistant to clodinafop-propargyl. Distribution maps of infected fields by resistant A. ludoviciana and P. minor biotypes were processed using GIS. Results of this study could be used for running programs to manage resistant weeds and to prevent the development of resistant biotypes to other parts of the region.

Indentifying and mapping of wild oat (<i>Avena ludoviciana Dur.</i>) and <i>Phalaris minor Retz.</i> populations resistant to clodinafop-propargyl in wheat fields of Kordkuy

248th National Meeting (2014)

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Indentifying and mapping of wild oat (Avena ludoviciana Dur.) and Phalaris minor Retz. populations resistant to clodinafop-propargyl in wheat fields of Kordkuy