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| Fraga,D.S.; Agostinetto,D.; Vargas,L.; Nohatto,M.A.; Thürmer,L.; Holz,M.T.. |
| Ryegrass is the main weed in wheat crop, causing yield loss due to competition by environmental resources. The objectives of this study were to estimate the fitness cost of ryegrass biotypes with low-level resistance and susceptible to fluazifop and to investigate the relative competitive ability of these biotypes between themselves and against the crop. Thus, fitness cost and competitive ability experiments were conducted under greenhouse conditions. For the fitness cost experiments, the low-level resistant ryegrass biotypes and those susceptible to fluazifop were used. For competitive ability, the treatments were arranged in a replacement series, with five proportions of the wheat cultivar FUNDACEP Horizonte and the low-level resistant and susceptible... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Competition; Lolium multiflorum. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400014 |
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| Vargas,L.; Fraga,D.S.; Agostinetto,D.; Mariani,F.; Duarte,T.V.; Silva,B.M.. |
| Chemical control with herbicides, especially glyphosate, is the main method used to control ryegrass. However, the repeated use of glyphosate has selected resistant ryegrass biotypes. Thus, the ACCase inhibitor herbicides have become the main alternative to control glyphosate-resistant biotypes, being widely used by farmers in Rio Grande do Sul. Repeated use of ACCase inhibitors, in turn, have selected ryegrass biotypes resistant to this herbicide mechanism. Thus, the objective of this study was to evaluate the response of ryegrass biotypes to different clethodim rates by dose-response curves. Increasing doses (0, 12, 24, 48, 72, 96, 144 and 192 g a.i. ha-1) of the herbicide clethodim were applied at the 3-4 ryegrass leaf stage. The variables control at 14... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ryegrass; Cyclohexanodiones; Herbicide resistance. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400015 |
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| Mariani,F.; Vargas,L.; Agostinetto,D.; Silva,D.R.O.; Fraga,D.S.; Silva,B.M.. |
| Populações de azevém resistente aos inibidores da enzima ALS têm aumentado rapidamente nos campos cultivados. Para o manejo da resistência, são necessários estudos de herança da resistência, os quais permitem entender a evolução da resistência, a estrutura genética da população e a dinâmica de adaptação dos biótipos resistentes. Este trabalho teve como objetivo identificar o tipo de herança, o número de genes envolvidos e o grau de resistência dos biótipos de azevém, homozigotos e heterozigotos, resistentes ao iodosulfuron. A partir da seleção dos biótipos homozigoto resistente (R) e homozigoto suscetível (S), foram realizados cruzamentos (R x S) para obtenção de plantas F1, e estas, cruzadas para obtenção da F2, e realizaram-se retrocruzamentos entre... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lolium spp.; Genética; Herbicida. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000200351 |
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