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A Dynamic Decision Model of Technology Adoption under Uncertainty: Case of Herbicide-Resistant Rice AgEcon
Annou, Mamane Malam; Wailes, Eric J.; Thomsen, Michael R..
Herbicide-resistant (HR) rice technology is a potential tool for control of red rice in commercial rice production. Using an ex ante mathematical programming framework, this research presents an empirical analysis of HR rice technology adoption under uncertainty. The analysis accounts for stochastic germination of red rice and sheath blight to model a profit maximization problem of crop rotation among HR rice, regular rice, and soybeans. The results demonstrate that risk attitudes and technology efficiency determine adoption rates and optimal rotation patterns.
Tipo: Journal Article Palavras-chave: Biotechnology; Herbicide resistance; Mathematical programming; Profit maximization; Rice; Risk; Rotation; Technology; Adoption; Crop Production/Industries; Production Economics; Research and Development/Tech Change/Emerging Technologies; Q16; Q18; O33; C61.
Ano: 2005 URL: http://purl.umn.edu/43724
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A Rapid Phenotyping Method for Imazamox Resistance in Wheat Planta Daninha
BRECCIA,G.; BISIO,M.B.; PICARDI,L.; NESTARES,G..
ABSTRACT: The availability of imidazolinone (IMI) resistant cultivars has provided an effective option for weed control in wheat production systems. IMI herbicides control several weeds, including Avena fatua and Lolium multiflorum, which are the most frequent grass weeds in wheat crops of the Argentine Pampas. The aim of this study was to develop a soil-less method that allows rapid phenotyping of IMI resistance in wheat. Nine wheat cultivars differing in IMI resistance were evaluated through a between-paper germination method. Herbicide concentrations required to reduce shoot and root length by 50% for resistant cultivars were > 75 fold that of the susceptible cultivars. The response of resistant and susceptible commercial cultivars was assessed in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Imidazolinone; Herbicide resistance; Germination test; Triticum aestivum L.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100344
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Ammonium Glufosinate Associated with Post-Emergence Herbicides in Corn with the cp4-epsps and Pat Genes Planta Daninha
KRENCHINSKI,F.H.; CESCO,V.J.S.; CASTRO,E.B.; CARBONARI,C.A.; VELINI,E.D..
ABSTRACT: With the possibility of using ammonium glufosinate in corn, studies on its association with other herbicides are essential. The aim of this study was to assess weed control and herbicide selectivity in association with ammonium glufosinate in corn containing the pat and cp4-epsps genes. The experiment was carried out under field conditions in two sites in a randomized block design with four replications. Treatments consisted of ammonium glufosinate, glyphosate, ammonium glufosinate + glyphosate, ammonium glufosinate + nicosulfuron, ammonium glufosinate + atrazine, ammonium glufosinate + tembotrione, ammonium glufosinate + mesotrione, ammonium glufosinate + carfentrazone ethyl, ammonium glufosinate + bentazon, ammonium glufosinate + 2,4-D, control...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ammonia accumulation; Phosphinothricin; Electron transport rate; Herbicide resistance; Zea mays.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100241
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Barnyardgrass with Multiple Resistance to Synthetic Auxin, ALS and Accase Inhibitors Planta Daninha
EBERHARDT,D.S.; OLIVEIRA NETO,A.M.; NOLDIN,J.A.; VANTI,R.M..
ABSTRACT The objective of this research was to confirm the resistance of a barnyardgrass biotype (Echinochloa crus-galli) to herbicides quinclorac (synthetic auxin), penoxsulam (ALS inhibitor) and cyhalofop-butyl (ACCase inhibitor). Two experiments were carried out in a greenhouse located in Itajaí, State of Santa Catarina, Brazil. One experiment evaluating the biotype ECH 18 (known as susceptible) and one with the ECH 141 biotype (suspected to be multiple resistant). The experimental design used was completely randomized, in a 4 x 7 factorial arrangement with four replications. The first factor was the herbicide: cyhalofop-butyl (Clincher(r)), penoxsulam (Ricer(r)), quinclorac (Facet(r)) and propanil (Grassaid(r)) and the second factor consisting of seven...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Paddy rice; Echinochloa crus-galli; Chemical control; Herbicide resistance.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400823
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Bioassay for detection of transgenic soybean seeds tolerant to glyphosate. Repositório Alice
TORRES, A.C.; NASCIMENTO, W.M.; PAIVA, S.A.V.; ARAGÃO, F.A.S. de.
Glyphosate is a systemic, nonselective, postemergence herbicide that inhibits growth of both weeds and crop plants. Once inside the plant, glyphosate interferes with biosynthesis of aromatic amino acids phenylalanine, tyrosine, and tryptophan, by inhibiting the activity of 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), a key enzyme of the shikimate pathway. The objective of this work was to develop a simple, effective and inexpensible method for identification of transgenic soybean tolerant to glyphosate. This technique consisted in germinating soybean seeds in filter paper moistened with 100 to 200 mM of glyphosate. Transgenic soybean seeds tolerant to glyphosate germinated normally in this solution and, between 7 and 10 days, started to develop a...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Glycine max; Herbicide resistance; Transgenic plants; Biosynthesis; Resistência a herbicida; Plantas transgênicas; Biossíntese.
Ano: 2003 URL: http://www.alice.cnptia.embrapa.br/handle/doc/109203
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Bioassay for detection of transgenic soybean seeds tolerant to glyphosate PAB
Torres,Antonio Carlos; Nascimento,Warley Marco; Paiva,Sonia Alessandra Vasconcelos; Aragão,Fernando Antonio Souza de.
Glyphosate is a systemic, nonselective, postemergence herbicide that inhibits growth of both weeds and crop plants. Once inside the plant, glyphosate interferes with biosynthesis of aromatic amino acids phenylalanine, tyrosine, and tryptophan, by inhibiting the activity of 5enolpyruvylshikimate-3-phosphate synthase (EPSPS), a key enzyme of the shikimate pathway. The objective of this work was to develop a simple, effective and inexpensible method for identification of transgenic soybean tolerant to glyphosate. This technique consisted in germinating soybean seeds in filter paper moistened with 100 to 200 muM of glyphosate. Transgenic soybean seeds tolerant to glyphosate germinated normally in this solution and, between 7 and 10 days, started to develop a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Herbicide resistance; Transgenic plants; Biosynthesis.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000900005
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Buva (Conyza sumatrensis) resistente a Paraquat. Repositório Alice
ZOBIOLE, L. H. S.; PEREIRA, V. G. C.; ALBRECHT, A. J. P.; RUBIM, R. S.; ADEGAS, F. S.; ALBRECHT, L. P..
bitstream/item/190293/1/buva-XXXI-CBCPD.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Erva Daninha; Resistência a Pesticida; Weeds; Herbicide resistance; Conyza.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103698
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Comparison of Sensitivity to Glyphosate of Euphorbia davidii Populations Planta Daninha
NÚÑEZ FRÉ,F.R.; JUAN,V.F.; YANNICCARI,M.; SAINT ANDRÉ,H.M.; FERNANDEZ,R.R..
ABSTRACT: Euphorbia davidii (Euphorbiaceae) is a summer annual weed present in the Province of Buenos Aires, Argentina. The aim of this study was to compare the sensitivity to glyphosate of different populations of Euphorbia davidii. Two techniques were used: a seed bioassay and shikimate determination in glyphosate-treated plants. Germination rates of seeds belonging to the populations from Espartillar, Barrow, Olavarria and Azul exposed to different concentrations of glyphosate were compared. Plants from the same locations treated with glyphosate were evaluated to determine shikimate levels. The most sensitive population was from Espartillar, with a CE50 (average effective concentration) of 4.00 g e.a. L-1. Based on this finding, the resistance index for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herbicide resistance; Germination; Bioassay; Shikimate; EUDA5.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100209
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Competition effects with mixed stands of wheat and kochia (Kochia scoparia) biotypes resistant and susceptible to acetolactase synthase inhibitor herbicides Scientia Agricola
Christoffoleti,P.J.; Westra,P..
Greenhouse experiments were conducted to compare the competitive ability of sulfonylurea resistant and susceptible kochia (Kochia scoparia L. Schard) compared to wheat. The results of several replacement series experiments indicate that wheat was the dominant competitor, and an average of one wheat plant reduced resistant kochia yield per plant equal to the effect of 4.8 resistant kochia or 5.4 susceptible kochia plants. Intraspeciflc competition was more important than interspecific competition for wheat, whereas the reverse was true for the resistant and susceptible kochia. The results of the niche differentiation index (NDI) indicate that wheat and either resistant or susceptible kochia are only partly limited by the same resources. The resistant and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Weed; Herbicide resistance; Sulfonylurea; Kochia scoparia; Weed-crop competition.
Ano: 1994 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200008
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Competitiveness of ALS inhibitors resistant and susceptible biotypes of Greater Beggarticks (Bidens subalternans) Planta Daninha
Lamego,F.P.; Vidal,R.A.; Burgos,N.R..
The continuous use of ALS-inhibiting herbicides has led to the evolution of herbicide-resistant weeds worldwide. Greater beggarticks is one of the most troublesome weeds found in the soybean production system in Brazil. Recently, a greater beggarticks biotype that is resistant (R) to ALS inhibitors due to Trp574Leu mutation in the ALS gene was identified. Also, the adaptive traits between susceptible (S) and R to ALS inhibitors biotypes of greater beggarticks were compared. Specifically, we aimed to: (1) evaluate and compare the relative growth rates (RGR) between the biotypes; (2) analyze the seed germination characteristics of R and S biotypes under different temperature conditions; and (3) evaluate their competitive ability in a replacement series...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bidens; Fitness; Herbicide resistance; Replacement series.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000200024
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Contribution of non-target-site resistance in imidazolinone-resistant Imisun sunflower Bragantia
Breccia,Gabriela; Gil,Mercedes; Vega,Tatiana; Altieri,Emiliano; Bulos,Mariano; Picardi,Liliana; Nestares,Graciela.
ABSTRACT The first commercial herbicide-resistant trait in sunflower (Helianthus annuus L.) is known as ‘Imisun’. Imidazolinone resistance in Imisun cultivars has been reported to be genetically controlled by a major gene (known as Imr1 or Ahasl1-1) and modifier genes. Imr1 is an allelic variant of the Ahasl1 locus that codes for the acetohydroxyacid synthase, which is the target site of these herbicides. The mechanism of resistance endowed by modifier genes has not been characterized and it could be related to non-target-site resistance. The objective of this study was to evaluate the role of cytochrome P450 monooxygenases (P450s) in Imisun resistance. The response to imazapyr herbicide in combination with P450s inhibitor malathion was evaluated in 2...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helianthus annuus L.; Cytochrome P450 monooxygenases; Imazapyr; Herbicide resistance.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400536
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Defenses against ROS in crops and weeds: the effects of interference and herbicides. Repositório Alice
CAVERZAN, A.; PIASECKI, C.; CHAVARRIA, G.; STEWART JR, C. N.; VARGAS, L..
bitstream/item/203387/1/ID44704-2019v20n5IntJMolSci.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Herbicida; Erva Daninha; Herbicide resistance; Oxidative stress; Weeds; Reactive oxygen species.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113370
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Development and molecular characterization of herbicide resistant transgenic rice (Oryza sativa L.) and assessment of gene flow from transgenic to non-transgenic rice using gus as a reporter gene International Rice Research Institute
Kaur, Jatinder.
xvi, 133 p. : col. ill. Thesis (Ph.D.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Genetic engineering; Molecular genetics; Herbicide resistance; Transgenic plants; Gene flow; Reporter genes.
Ano: 2002 URL: http://hdl.handle.net/123456789/434
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Dose-response curves of Lolium multiflorum biotypes resistant and susceptible to clethodim. Repositório Alice
VARGAS, L.; FRAGA, D. S.; AGOSTINETTO, D.; MARIANI, F.; DUARTE, T. V.; SILVA, B. M..
2013
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Azevém; Ciclohexanodionas; Resistência a herbicidas; Ryegrass; Cyclohexanodiones; Herbicide resistance.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/978444
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Dose-response curves of Lolium multiflorum biotypes resistant and susceptible to clethodim Planta Daninha
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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Economic impacts of high labour cost and herbicide resistance for the management of annual barnyardgrass (Echinochloa crus-galli) in rice production in the Philippines AgEcon
Beltran, Jesusa C.; Pannell, David J.; Doole, Graeme J..
Implications of increasing labour cost and development of herbicide resistance for profitable weed management in Philippine rice farming systems are investigated. The study employs RIMPhil (Resistance and Integrated Management in the Philippines), a bioeconomic simulation model developed to provide a comprehensive assessment of integrated weed management programmes for the control of annual barnyardgrass (Echinochloa crus-galli) in rice crops. Results indicate that herbicide application will become increasingly economically attractive, relative to manual weeding, as labour cost increases. This is important since urban migration in the Philippines continues to increase the scarcity of rural labour. Results also show that the onset of herbicide resistance...
Tipo: Working or Discussion Paper Palavras-chave: Barnyardgrass; Bioeconomic model; Herbicide resistance; Integrated weed management; Rice production; Crop Production/Industries; Farm Management; Research and Development/Tech Change/Emerging Technologies.
Ano: 2011 URL: http://purl.umn.edu/108770
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Evaluation of Fenoxaprop-P-Ethyl Resistant Littleseed Canarygrass (Phalaris minor) in Pakistan Planta Daninha
ABBAS,T.; NADEEM,M.A.; TANVEER,A.; AHMAD,R..
ABSTRACT To test resistance status of Phalaris minor (littleseed canary grass) to fenoxaprop-P-ethyl in Pakistan, a field survey was conducted during 2014. Uncontrolled P. minor plants were selected for seed collection from wheat fields where fenoxaprop-P-ethyl was used to control P. minor. Seeds were collected from eight different locations near Fasialabad, Pakistan. Susceptible plants were also selected near Faisalabad having no history of fenoxaprop-P-ethyluse for comparison. These seeds were grown in pots for resistance confirmation using completely randomized design with factorial arrangement having four replicates. Four doses of fenoxaprop-P-ethylcontrol (0X), 46.9 (0.5X), 93.7 (1X) and 187 (2X) g a.i. ha-1 were sprayed at 3 to 4 leaf stage of P....
Tipo: Info:eu-repo/semantics/article Palavras-chave: ACCase-inhibiter; LD50; Phalaris minor; Herbicide resistance; Resistance index; Survey.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400833
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Evolution, epigenetics and resistance - troublesome weeds¹. Repositório Alice
CONCENCO, G..
2016
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Neo darwinism; Herbicide resistance; Chemical groups.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1056275
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Evolutionary and social consequences of introgression of nontransgenic herbicide resistance from rice to weedy rice in Brazil. Repositório Alice
MEROTTO JUNIOR, A.; GOULART, I. C. G. dos R.; NUNES, A. L.; KALSING, A.; MARKUS, C.; MENEZES, V. G.; WANDER, A. E..
Several studies have expressed concerns about the effects of gene flow from transgenic herbicide-resistant crops to their wild relatives, but no major problems have been observed. This review describes a case study in which what has been feared in transgenics regarding gene flow has actually changed biodiversity and people?s lives. Nontransgenic imidazolinone-resistant rice (IMI-rice) cultivars increased the rice grain yield by 50% in southern Brazil. This increase was beneficial for life quality of the farmers and also improved the regional economy. However, weedy rice resistant to imidazolinone herbicides started to evolve three years after the first use of IMI-rice cultivars. Population genetic studies indicate that the herbicide- resistant weedy rice...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Fluxo de genes; Clearfield TM; Fitness; Arroz; Herbicida; Red rice; Herbicide resistance; Outcrossing; Imazethapyr; Gene flow; Acetolactate synthase.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1065797
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Factors influencing adoption of conservation tillage in Australian cropping regions AgEcon
D'Emden, Francis H.; Llewellyn, Rick S.; Burton, Michael P..
The purpose of this research is to improve understanding of conservation tillage adoption decisions by identifying key biophysical and socio-economic factors influencing no-till adoption by grain growers across four Australian cropping regions. The study is based on interviews with 384 grain growers using a questionnaire aimed at eliciting perceptions relating to a range of possible long- and short-term agronomic interactions associated with the relative economic advantage of shifting to a no-tillage cropping system. Together with other farm and farmer-specific variables, a dichotomous logistic regression analysis was used to identify opportunities for research and extension to facilitate more rapid adoption decisions. The broader systems approach to...
Tipo: Article Palavras-chave: Adoption; Conservation tillage; Herbicide resistance; No-till; Perceptions; Weed management; Farm Management.
Ano: 2008 URL: http://purl.umn.edu/118537
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