Abstract

SCURSONI, J. et al. Crecimiento, supervivencia y fecundidad de individuos de Avena fatua L. tratados con herbicidas inhibidores de ALS e inhibidores de ACCasa. RIA. Rev. investig. agropecu. [online]. 2021, vol.47, n.3, pp.361-366.  Epub Dec 01, 2021. ISSN 1669-2314.

Wild oat (Avena fatua L.) is one of the most frequent weeds of winter cereals in Argentina. Its control is carried out mainly with the application of ACCase and ALS inhibitor herbicides. The efficacy of these herbicides is evaluated by visual control and survival, without considering other demographic processes such as fecundity. Between 2012 and 2015, seven experiments were carried out at the Faculty of Agronomy of the University of Buenos Aires. The objective was to study the effect of three ALS inhibitors (pyroxsulam, iodosulfuron + mesosufuron, imazamox) and two ACCase inhibitors (fenoxaprop and pinoxaden) on the survival, growth and fecundity of wild oat individuals. In addition, the effect of the origin of the population (with or without previous application of herbicides) was studied. Each herbicide was applied at five rates (0x, 0.25x, 0.5x, 1x, 1.5x), being x the recommended rate on the label. Survival at 30 and 60 days after treatment and individual biomass at 30 days after treatment and at maturity were evaluated. Fecundity was evaluated by harvesting the seeds of the surviving plants. Thirty days after the herbicides application, at the recommended rate, pinoxadén showed lower survival than the other herbicides. Iodosulfuron + mesosulfuron and imazamox at the recommended rate were more effective than pyroxsulam and fenoxaprop. At 60 days after treatment there were no differences between pinoxaden, iodosulfuron + mesosulfuron and imazamox at the recommended rate and were more effective than fenoxaprop and pyroxsulam. The survivors individuals produced less biomass than the untreated ones. On average, individuals with or without herbicide application produced 31 seeds per gram of individual biomass.

Keywords : ACcase; ALS; grass weeds; weeds on wheat.

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