Consulta: subjectFacets:"Weed resistance"
Registros recuperados: 5
Data/hora: 06/06/2024 04:20:29

Degradation Enhancement as the Mechanism of Resistance to Imazethapyr in Barnyardgrass
Provedor de dados: 87
Autores: DALAZEN,G.; PISONI,A.; RAFAELI,R.S.; MEROTTO JR.,A.
ABSTRACT: Non-target site (NTS) herbicide resistance by degradation enhancement is an increasing problem in several weeds around the world. In this study, the occurrence of degradation enhancement by cytochrome P450 monooxygenases (cytP450) was evaluated as the mechanism of resistance to imazethapyr in barnyardgrass. The cytP450 inhibitors malathion and piperonyl butoxide (PBO) and the inducer naphthalic anhydride (NA), applied in mixture or sequentially with imazethapyr, were evaluated on imidazolinone-susceptible and -resistant barnyardgrass byotipes. In addition, the degradation of imazethapyr was analyzed in plants treated with imazethapyr applied alone or two hours after malathion or NA. The spraying of malathion and PBO reduced the resistance factor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Echinochloa crus-galli; Herbicide detoxification; Weed resistance; Imidazolinones; CytP450.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100317

A Modified phosphate-carrier protein theory is proposed as a non-target site mechanism For glyphosate resistance in weeds
Provedor de dados: 87
Autores: 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

Control of glyphosate resistant hairy fleabane (Conyza bonariensis) with dicamba and 2,4-D
Provedor de dados: 87
Autores: 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

Impact of GE Crop Adoption on Quality-Adjusted Herbicide Use in U.S. Corn Production
Provedor de dados: 31
Autores: 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

Sensitivity of imidazolinone-resistant red rice (Oryza sativa L.) to glyphosate and glufosinate
Provedor de dados: 65
Autores: Cassol,Guilherme Vestena; Avila,Luis Antonio de; Zemolin,Carla Rejane; Piveta,Andrey; Agostinetto,Dirceu; Merotto Júnior,Aldo.
Dose-response experiments were carried out to evaluate the sensitivity of imidazolinone-resistant red rice to nonselective herbicides currently used in rice-soybean rotation in Rio Grande do Sul. Two red rice biotypes previously identified as resistant and susceptible to the imidazolinone herbicides were treated with imazapic plus imazapic, glyphosate and glufosinate under nine herbicide rates. A non-linear log-logistic analysis was used to estimate the herbicide rate that provided 50% red rice control and dry weight reduction (GR50). Imidazolinone-resistant red rice exhibited greater GR50 values than imidazolinone-susceptible biotype for imazapyr plus imazapic. In contrast, both imidazolinone-resistant and susceptible red rice showed similar GR50values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Learfield(r) rice; Nonselective herbicides; Red rice management; Rice-soybean rotation; Weed resistance.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000901557