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| Registros recuperados: 24 | |
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| SILVA, A. F. da; KARAM, D.; VARGAS, L.; ADEGAS, F. S.; GAZZIERO, D. L. P.; IKEDA, F. S.; CAVALIERI, S. D.; COSTA, A. G. F.; PERINA, F. J.. |
| O monitoramento da dispersão de plantas daninhas resistentes a herbicidas é prática importante para elaboração de estratégias de manejo mais efetivas. O objetivo deste trabalho é avaliar a dispersão destas plantas no território nacional. O trabalho foi conduzido durante duas safras (2018/2019 e 2019/2020). Foram realizadas coletas e georreferenciamento de sementes de biótipos de buva (Conyza spp), capim-amargoso (Digitaria insularis), capim-pé-de-galinha (Eleusine indica) e azevém (Lolium perene spp multiflorum). As sementes foram identificadas, armazenadas e posteriormente levadas para casa de vegetação para a realização de testes para verificação de resistência ao glifosato. A variável analisada foi o controle visual aos 28 dias após a aplicação dos... |
| Tipo: Folhetos |
Palavras-chave: Conyza spp; Digitaria insularis; Lollium perene spp multiflorum; Erva Daninha; Dispersão; Resistência a Produtos Químicos; Eleusine indica. |
| Ano: 2021 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1136521 |
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| GAZZIERO,D.L.P.; ADEGAS,F.S.; SILVA,A.F.; CONCENÇO,G.. |
| ABSTRACT: Efficient management of sourgrass is one of the main challenges faced by Brazilian soybean farmers. Biological and ecological characteristics of this weed, as well as wide distribution of glyphosate-resistant biotypes, make it difficult to control this species. The objective of this work was to estimate interference of sourgrass in soybean yield. Seven experiments were conducted during three consecutive years (2012/2013, 2013/2014 and 2015/2016 cropping seasons); six of them were on-farm trials where sourgrass infestation was mainly originated from clump regrowth, while infestation originated from seeds in one trial. Data from all sites and experiments were submitted to a combined analysis, according to the study factors and variables, to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Perennial; Glyphosate-resistant weed; Glycine max. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100246 |
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| RAIMONDI,R.T.; CONSTANTIN,J.; MENDES,R.R.; OLIVEIRA JR.,R.S.; RIOS,F.A.. |
| ABSTRACT: Currently, sourgrass is one of the most important weeds in grain production areas in Brazil. The objective of this work was to evaluate the efficiency of associated systems composed by mowing and chemical control against clumped sourgrass. In the first experiment, different mowing heights (0, 5, 10, 15 and 20 cm), coupled with complementary applications of glyphosate + clethodim, were evaluated on sourgrass control. The second experiment was composed by programs starting with fallow mowing at different times, 50 (early), 35 (intermediate) and 20 (late) days before soybean sowing. After mowing, treatments were followed by herbicide applications according to the need until soybean harvest. The shorter the mowing height associated with herbicide... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Mechanical control; Soybean; Fallow. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100232 |
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| GAZOLA,T.; DIAS,M.F.; BONATTO,V.M.; BELAPART,D.; CARBONARI,C.A.; VELINI,E.D.. |
| ABSTRACT: Sourgrass (Digitaria insularis) is a perennial plant with high infestation potential, has fast and aggressive development, and reproduces by seeds and rhizomes. D. insularis infestations have increased in agricultural areas without cover crops established between the main crop seasons. The control of this species has become one of the most expensive in these areas in Brazil. The present work evaluated the growth and development of D. insularis plants from different vegetative parts of clumps. Two greenhouse experiments were conducted in a completely randomized design, with four replications. A 5 × 4 factorial arrangement was used, with factor A corresponding to the different propagation methods, and factor B corresponding to the biotypes used... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Weeds; Resistance to herbicides. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100182 |
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| GAZOLA,T.; DIAS,M.F.; CARBONARI,C.A.; VELINI,E.D.. |
| ABSTRACT: The objective of this work was to monitor the resistance of sourgrass (Digitaria insularis) to glyphosate in urban areas of the State of São Paulo to understand the spread of resistant biotypes. Three experiments were conducted under greenhouse conditions in a completely randomized design, with four replications. In the first experiment, seven sourgrass biotypes were used, and the control of plants was evaluated at 7, 14, 21, 28, and 35 days after application (DAA) of glyphosate. In the second experiment, the shikimic acid accumulation was quantified at 72 hours after the glyphosate application, and the same evaluations of weed control were performed. In the third experiment, rate-response curves were developed, with glyphosate at rates of 0, 90,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Shikimic acid; Digitaria insularis; EPSPS; Resistance. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100183 |
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| Carvalho,S.J.P.; Dias,A.C.R.; Shiomi,G.M.; Christoffoleti,P.J.. |
| Dois experimentos foram desenvolvidos em casa de vegetação, com o objetivo de avaliar a eficácia do herbicida glyphosate sobre plantas de Digitaria insularis quando soluções de ureia (U; 5 g L-1), sulfato de amônio (SA; 15 g L-1) ou U+SA (2,5 + 7,5 g L-1) foram utilizadas como veículo de pulverização. Aos 28 dias após aplicação, de acordo com as curvas de dose-resposta (primeiro experimento), foram necessários 409 g ha-1 de glyphosate para atingir 50% de controle da planta daninha (C50) quando água sem adjuvantes foi usada como veículo de pulverização. Para obtenção dos mesmos 50% de controle, as doses de glyphosate foram reduzidas para 373, 208 e 189 g ha-1; quando o herbicida foi pulverizado utilizando solução de U, SA ou U+SA, respectivamente. A redução... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Curva dose-resposta; Dessecação; Nitrogênio. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000300014 |
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| GAZOLA,T.; DIAS,M.F.; DIAS,R.C.; CARBONARI,C.A.; VELINI,E.D.. |
| ABSTRACT: The objective of this work was to evaluate the effects of the 2,4-D herbicide on the growth and development of Digitaria insularis and Digitaria horizontalis plants under different climatic conditions. Two greenhouse experiments were conducted in a completely randomized design, with 11 treatments (rates of the herbicide) and four replications. Rate-response curves were determined for the 2,4-D rates of 0, 50.37, 100.75, 201.5, 403, 806, 1,612, 3,224, 6,448, 12,896, and 25,792 g a.i. ha-1. The plants presented growth stimulus with low rates of 2,4-D in the autumn-winter period, but this stimulus was not found in the spring-summer period. The plants subjected to application of high rates of 2,4-D had significantly lower growth and development than... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Synthetic auxin; Digitaria insularis; Digitaria horizontalis; Hormesis. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100173 |
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| Marques,B.S.; Silva,A.P.P.; Lima,R.S.O.; Machado,E.C.R.; Gonçalves,M.F.; Carvalho,S.J.P.. |
| This work was carried out with the objective of evaluating growth and development of sourgrass (Digitaris insularis) based on days or thermal units (growing degree days - GDD). Two independent trials were developed aiming to quantify the species' phenological development and total dry matter accumulation in increasing or decreasing photoperiod conditions. Plants were grown in 4 L plastic pots, filled with commercial substrate, adequately fertilized. In each trial, nine growth evaluations were carried out, with three replicates. Phenological development of sourgrass was correctly fit to time scale in days or GDD, through linear equation of first degree. Sourgrass has slow initial growth, followed by exponential dry matter accumulation, in increasing... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Growing degree days; Phenology; Dry matter; Biology. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000300003 |
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| Zambão,Jackson; v.H. Bittencourt,Henrique; T.S. Bonome,Lisandro; M. Trezzi,Michelangelo; C.P.P. Fernandes,Augusto. |
| Abstract Background: Substantial losses to crops can occur due to the presence of sourgrass in agroecosystems, which is promoted by its seed dispersal ability. Environmental factors can affect sourgrass germination and emergence. Objective: The objective of this study was to determine the effects of water restriction, salinity, and depth of sowing on the sourgrass germination and emergence processes. Methods: Experiments using sourgrass seeds were conducted under controlled conditions simulating osmotic and saline stress and seeding depths. The data collected was submitted to analysis of variance and adjusted to models by regression analysis. Results: Smaller osmotic potentials reduced germination, normal seedlings, and increased quiescence, with no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Water stress; Seeding depth. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100307 |
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| CASSOL,M.; MATTIUZZI,M.D.; ALBRECHT,A.J.P.; ALBRECHT,L.P.; BACCIN,L.C.; SOUZA,C.N.Z. |
| ABSTRACT: Sourgrass is one of the weeds of great economic importance in Brazil due to its difficulty of control and conditions that allow its emergence and development throughout the year. Thus, this study aimed to evaluate the effectiveness of clethodim and haloxyfop applied alone or mixed with glyphosate and other herbicides to control glyphosate-resistant sourgrass at different stages of development. For this, three experiments were conducted in the field: in experiment 1, the herbicides were applied in sourgrass plants with 6 to 8 tillers; and in experiments 2 and 3, when plants were at full flowering, with up to 18 tillers. After treatment application, visual evaluations were performed at 14, 21, 28, 35, 42, 49, and 56 days after application (DAA) in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Grass control; Clethodim; Haloxyfop. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100259 |
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| Carvalho,L.B.; Bianco,M.S.; Bianco,S.. |
| The experiment was carried out aiming to analyze the dry mass production and distribution and the content and accumulation of macronutrients in sourgrass (Digitaria insularis) plants cultivated under mineral nutrition standard conditions. Plants grew in 7-liter pots filled with sand substrate and daily irrigated with nutrient solution, being maintained under greenhouse conditions. Treatments consisted of times of evaluation (21, 35, 49, 63, 77, 91, 105, 119, and 133 days after emergence - DAE) and were arranged in a completely randomized design with four replicates. Sourgrass showed small accumulation of dry mass (0.3 g per plant) and macronutrients (3.7 mg of N per plant, 0.4 mg of P per plant, 5.6 mg of K per plant, 0.9 mg of Ca per plant, 0.7 mg of Mg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Plant growth; Mineral nutrition. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400004 |
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| Procópio,S.O.; Pires,F.R.; Menezes,C.C.E.; Barroso,A.L.L.; Moraes,R.V.; Silva,M.V.V.; Queiroz,R.G.; Carmo,M.L.. |
| Este trabalho teve como objetivo avaliar a eficiência do glyphosate e da mistura comercial paraquat + diuron, bem como o efeito do intervalo entre as aplicações desses herbicidas e a semeadura da soja, sobre o controle e a rebrota de Digitaria insularis, Synedrellopsis grisebachii e Leptochloa filiformis. O experimento foi conduzido em área de soja em sistema de plantio direto, utilizando-se o delineamento de blocos casualizados com nove tratamentos e quatro repetições. Foram avaliados os seguintes tratamentos: glyphosate no dia da semeadura e um, dois e cinco dias antes desta; paraquat + diuron 20 dias antes e no dia da semeadura; glyphosate 10 dias antes da semeadura e paraquat + diuron no dia da semeadura; glyphosate 15 dias antes da semeadura e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Synedrellopsis grisebachi; Leptochloa filiformis. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582006000100024 |
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| MELO,M.S.C.; ROCHA,L.J.F.N.; BRUNHARO,C.A.C.G.; NICOLAI,M.; TORNISIELLO,V.L.; NISSEN,S.J.; CHRISTOFFOLETI,P.J.. |
| ABSTRACT: The knowledge on the mechanism that gives a weed resistance to a particular herbicide is essential regarding scientific, academic, and practical aspects because it determines the recommendations for prevention and management of resistance in the field. Studies on the sourgrass (Digitaria insularis) glyphosate resistance mechanism in the literature have not been conclusive. Thus, the aim of this research was to study and evaluate the putative resistance mechanisms whichgives sourgrass biotypes, the ability to survive after glyphosate application. For this, 14C-glyphosate leaf absorption and translocation were compared in the biotypes Matão (R), Campo Florido (MG), Diamantino (MT), and Iracemápolis (S) as a function of the time after its... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Absorption; Translocation; Mutation; 14C-glyphosate; Digitaria insularis. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100232 |
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| Carvalho,L.B; Alves,P.L.C.A; Bianco,S. |
| The objective of this work was to evaluate the coexistence effects of coffee (Coffea arabica) with densities of sourgrass (Digitaria insularis) on crop macronutrient content and plant growth. The experiment was conducted in plots where one coffee plant was maintained in coexistence with 0 (weed-free check), 1, 2, 4, 8, and 16 sourgrass plants, using a completely randomized design with three replicates. Reduction of coffee growth and macronutrient content, except P that increased, started when the coexistence occurred with sourgrass plants in a density of 1 plant per plot. In general, macronutrient content was reduced by 18-50%, while growth characteristics were reduced by 9-41%, when coffee plants coexisted with 16 plants of sourgrass. Thus, sourgrass... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Digitaria insularis; Competition; Additive experiment; Nutrients. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000100012 |
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| Registros recuperados: 24 | |
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