Dose-response curves of Lolium multiflorum biotypes resistant and susceptible to clethodim
| Autor: | D.S. Fraga, Leandro Vargas, Franciele Mariani, T.V. Duarte, B.M. Silva, Dirceu Agostinetto |
|---|---|
| Přispěvatelé: | LEANDRO VARGAS, CNPT, UFPel, UFPel. |
| Rok vydání: | 2013 |
| Předmět: |
ryegrass
cyclohexanodiones herbicide resistance QH301-705.5 Physiology Plant Science Biochemistry chemistry.chemical_compound Shoot dry weight Biology (General) Ciclohexanodionas biology Resistência a herbicidas Botany food and beverages Azevém Lolium multiflorum Cyclohexanodiones biology.organism_classification Dose–response relationship Agronomy chemistry QK1-989 Glyphosate Chemical control Agronomy and Crop Science After treatment |
| Zdroj: | Planta Daninha v.31 n.4 2013 Planta daninha Sociedade Brasileira da Ciência das Plantas Daninhas (SBCPD) instacron:SBCPD Planta Daninha, Vol 31, Iss 4, Pp 887-892 (2013) Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA-Alice) Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
| ISSN: | 0100-8358 |
| DOI: | 10.1590/s0100-83582013000400015 |
| Popis: | 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 and 28 days after treatment (DAT) and shoot dry weight were evaluated. The data were fitted by nonlinear regression log-logistic and C50 and GR50 were calculated based on the equation. The resistance factor was obtained by the ratio of C50 or GR50 of the resistant biotype by matching the susceptible biotype. Based on the equation parameters, the doses of GR50 64.7 and 234.5 g a.i. ha-1 clethodim and C50 11.2 and 172.1 g a.i. ha-1 clethodim were obtained, at 28 DAT for the susceptible and resistant biotypes, respectively. The ryegrass biotype denominated Cotril is resistant to clethodim, being controlled with a dose 15.3 times greater than that of the susceptible biotype, and a 50% reduction of this biotype occurs with a dose 3.62 times higher than that of the susceptible one. |
| Databáze: | OpenAIRE |
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