Ryegrass control derived from isolated application with herbicides association

Abstract

The objective of this work was to evaluate the efficiency of herbicides from different mechanism of action, isolate and in association in ryegrass control. The trial was conducted during the cool station in 2010 at field station of University of Cruz Alta located in Cruz Alta/RS. The treatments evaluated were: glyphosate (720, 1440 and 2160g a.e. ha^-1), fluazifop-butyl (200g ha^-1), clethodim (72g ha^-1), quizalofop- -p-ethyl (120g ha^-1), clodinafop-propargyl (120g ha^-1), glufosinate (500g ha^-1), paraquat (500g ha^-1), the associations of glyphosate (720g a.e. ha^-1) with fluazifop-butyl (125 and 200g ha^-1), clodinafop-propargyl (60 and 120g ha^-1), quizalofop-p-ethyl (96 g ha^-1), clethodim (72 g ha^-1), and a control without treatment. The treatment with glyphosate+clethodim (720+72 g ha^-1) and glypho­sate+quizalofop-p-ethyl were the positive highlights in ryegrass control.The ACCase inhibitors applied alone were not a good control option; however, the increase of glyphosate dose until 2160g a.e. ha^-1 improved the ryegrass control. The paraquat herbicide showed good control results, being superior to glufosinate, though both products results are not insurance for indicate your use alone. Associations of glyphosate with clethodim or quizalofop-p-ethyl and the increase of glyphosate dose proved an increment in control efficiency and reduced the ryegrass dry matter, constituting in viable options to control this specie.