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| Roso,A.C.; Vidal,R.A.. |
| Glyphosate is an herbicide that inhibits the enzyme 5-enolpyruvyl-shikimate-3-phosphate synthase (EPSPs) (EC 2.5.1.19). EPSPs is the sixth enzyme of the shikimate pathway, by which plants synthesize the aromatic amino acids phenylalanine, tyrosine, and tryptophan and many compounds used in secondary metabolism pathways. About fifteen years ago it was hypothesized that it was unlikely weeds would evolve resistance to this herbicide because of the limited degree of glyphosate metabolism observed in plants, the low resistance level attained to EPSPs gene overexpression, and because of the lower fitness in plants with an altered EPSPs enzyme. However, today 20 weed species have been described with glyphosate resistant biotypes that are found in all five... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Membrane carrier proteins; Herbicide; Weed resistance. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000500025 |
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| Soares,D.J.; Oliveira,W.S.; López-Ovejero,R.F.; Christoffoleti,P.J. |
| Auxyn type herbicides such as dicamba and 2,4-D are alternative herbicides that can be used to control glyphosate-resistant hairy fleabane. With the forthcoming possibility of releasing dicamba-resistant and 2,4-D-resistant crops, use of these growth regulator herbicides will likely be an alternative that can be applied to the control of glyphosate resistant hairy fleabane (Conyza bonariensis). The objective of this research was to model the efficacy, through dose-response curves, of glyphosate, 2,4-D, isolated dicamba and glyphosatedicamba combinations to control a brazilian hairy fleabane population resistant to glyphosate. The greenhouse dose-response studies were conducted as a completely randomized experimental design, and the rates used for dose... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conyza bonariensis; Dose-response; Glyphosate-resistant hairy fleabane; Weed resistance. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000200020 |
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| Nehring, Richard F.; Martin, Andrew; Fernandez-Cornejo, Jorge; Hallahan, Charles B.; Vialou, Alexandre; Wechsler, Seth James; Grube, Arthur. |
| This paper presents findings on the use of HT corn and quality-adjusted herbicide use for 12 key corn producing states using a panel data set for 1986-2008. Our preliminary findings indicate an insignificant impact of HT corn on herbicide use, conditioning or accounting for HT corn with other important drivers of corn herbicide use: HT soy, corn output price, glyphoste price, nonherbicide glyponsate price, and percentage of continuous corn and low-till corn. However, we find a positive and significant impact of HT corn on herbicide use in selected states, using regional interaction terms. We use econometric techniques to avoid spurious regression results. Other preliminary runs indicated that the results hold when running the US and regional interactions... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: HT-corn; Herbicides; Weed resistance; Glyphosate; Corn; Environmental Economics and Policy; Farm Management; Production Economics. |
| Ano: 2011 |
URL: http://purl.umn.edu/103369 |
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