Alteração das características biológicas dos biótipos de azevém (Lolium multiflorum) ocasionada pela resistência ao herbicida glyphosate

摘要: The identification of ryegrass biotypes resistant to glyphosate is causing changes in weed management apple orchards. Three experiments were carried out determine the GR50 of the biotypes, grass herbicides and dry matter accumulation. first experiment tested different rates glyphosate. Their effects on accumulation by biotype assessed. In second different tested: glyphosate, haloxyfop-r, diclofop, fluazifop-p, fenoxaprop-p paraquat. A third was under glasshouse conditions curve results showed 287.5 4,833.5 g e. a. ha-1 for sensitive respectively. that factor (RF) 16.8 resistance mechanism alters biological characteristics affecting its sensitivity herbicides.