Suscetibilidade comparativa a herbicidas pós-emergentes de biótipos de Digitaria ciliaris resistente e suscetível aos inibidores da ACCase

López-Ovejero, R.F.; Carvalho, Saul Jorge Pinto de; Nicolai, Marcelo; Christoffoleti, Pedro Jacob

doi:10.1590/s0100-83582006000400020

Cited by 10 publications

(8 citation statements)

References 14 publications

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“…It is a natural phenomenon that occurs spontaneously in the populations, and therefore the herbicide is not the causative agent, but the selector of the resistant individuals who are at low initial frequency (López-Ovejero et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Multiple resistance of Conyza sumatrensis to Chlorimuronethyl and to Glyphosate

et al. 2014

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Weed resistance to herbicides has been a major issue in Brazil, mainly due to the inefficiency of the herbicides used in no-till areas and to the high cost of these herbicide treatments. Failures in controlling the weed Conyza have been reported in Western and Northern grain crop areas in Paraná (Brazil). This work aimed to evaluate the potential occurrence of C. sumatrensis biotypes resistant to the herbicides chlorimuron-ethyl and glyphosate. Experiments were carried out under greenhouse conditions with four biotypes (Cascavel-2, Toledo-4, Tupãssi-6, and Assis Chateaubriand-7) possibly resistant to, as well as a population considered susceptible to chlorimuron-ethyl and glyphosate. To obtain dose-response curves, eight herbicide doses of chlorimuron-ethyl (0, 2.5, 5, 10, 20, 40, 80 and 160 g ha-1) and glyphosate (0, 90, 180, 360, 720, 1,440, 2,880 and 5,760 g e.a. ha-1) were applied and weed control and shoot biomass evaluations were made. Results provided evidence that two biotypes (Cascavel-2 and Tupãssi-6) were resistant to glyphosate and four biotypes (Cascavel-2, Toledo-4, Tupãssi-6 and Assis Chateaubriand-7) were resistant to chlorimuronethyl. Multiple resistance to glyphosate and chlorimuron was confirmed for biotypes Cascavel2 and Tupãssi 6. This is the first report on multiple resistance in Conyza sumatrensis, worldwide.

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Section: Introductionmentioning

confidence: 99%

Multiple resistance of Conyza sumatrensis to Chlorimuronethyl and to Glyphosate

et al. 2014

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“…A resistência de plantas daninhas a herbicidas é definida como a capacidade inerente e herdável de determinados biótipos, dentro de uma população, de sobreviver e se reproduzir após a exposição a doses de herbicidas que seriam letais a indivíduos normais (suscetí-veis) da mesma espécie (Christoffoleti & López-Ovejero, 2008). Trata-se de um fenômeno natural que ocorre espontaneamente nas populações, não sendo, portanto, o herbicida o agente causador, e sim selecionador dos indivíduos resistentes que se encontram em baixa frequência inicial (Christoffoleti et al, 1994;López-Ovejero et al, 2006b). …”

Section: Introductionunclassified

Herbicidas alternativos para controle de biótipos de Conyza bonariensis e C. canadensis resistentes ao glyphosate

et al. 2010

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Após sucessivos anos, aplicações do herbicida glyphosate em pomares de citros no Estado de São Paulo selecionaram biótipos resistentes de Conyza bonariensis e C. canadensis. Na ocorrência de plantas daninhas resistentes em uma área agrícola, tornam-se necessárias mudanças nas práticas de manejo para obtenção de adequado controle das populações resistentes, bem como para a redução da pressão de seleção sobre outras espécies. Assim, este trabalho foi realizado com o objetivo de identificar herbicidas alternativos para controle de biótipos de Conyza spp. resistentes ao herbicida glyphosate, com aplicações em diferentes estádios fenológicos da planta daninha. Três experimentos foram conduzidos em campo, em pomares de citros em formação, sobre plantas de buva em estádio fenológico de dez folhas e no pré-florescimento. Para plantas no estádio de dez folhas, controle satisfatório foi obtido com aplicações de glyphosate + bromacil + diuron (1.440 + 1.200 + 1.200 g ha-1), glyphosate + atrazina (1.440 + 1.500 g ha-1) e glyphosate + diuron (1.440 + 1.500 g ha-1). Quando em estádio de pré-florescimento de Conyza spp., a aplicação do herbicida amônio-glufosinato, na dose de 400 g ha-1, isolado ou associado a MSMA, bromacil+diuron, metsulfuron, carfentrazone e paraquat, foi a alternativa viável para controle dos biótipos resistentes ao glyphosate.

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“…These results can be explained by the fact that, despite these herbicides have the same action mechanism, they vary in the action spectrum in grasses control, as well as differences between different chemical groups (HARWOOD, 1999;OVEJERO-LÓPEZ et al, 2006). Another factor, according to Pallardy and Rhoads (1993), which can influence the absorption of herbicides by acting as a barrier, is the high cuticle resistance, namely a thick cuticle, which is an important morphological characteristics of resistance to drought, because it allows a greater water conservation in plants by reducing their loss through the epidermis (cuticular transpiration) and the ability to reduce perspiration allows plants to have better management of the water available in soil.…”

Section: Resultsmentioning

confidence: 99%

Influence of soil water potential in the action of herbicides on goosegrass (Eleusine indica (L) Gaertn)

Pereira¹,

Souza²,

Silva³

et al. 2015

Biosci. J.

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Currently, the use of herbicides is essential in a practical and common in agricultural areas, but efficiency of these herbicides can be compromised when applied on plants that thrive in water deficit conditions, due to low uptake and translocation of the product. Therefore, the aim of this study was to compare the efficiency of control ACCase inhibiting herbicides applied post-emergence in plants of Eleusine indica under different soil water contents. The experiment was conducted in a greenhouse and the experimental design was completely randomized design with four replications, consisting of a 9x4 factorial, with the combination of three soil water potentials (-0.03, -0.07 and -1.5 MPa) three herbicides (fluazifop-p -butyl, haloxyfop-methyl and sethoxydim + oil) and four doses (0, 25, 50, and 100 % of the recommended dose). Herbicide application was made in plants in vegetative stage 2-3 tillers. The soil water potential was initiated in the development stage of two leaves, and the water was supplemented until the soil reaches the potential of -0.01 MPa, when it came to minimum pre-determined for each water management. The physiological parameters evaluated were: photosynthetic rate, stomatal conductance, transpiration leaf temperature and plant dry mass. The visual assessments of phytotoxicity were performed at 7 and 14 days after application. The herbicides behaved in different ways according to the used water management. In severe water stress conditions (soil moisture at 8%) only fluazifop-p-butyl herbicide achieved satisfactory control (>90%) in E. indica plants.

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Suscetibilidade comparativa a herbicidas pós-emergentes de biótipos de Digitaria ciliaris resistente e suscetível aos inibidores da ACCase

Cited by 10 publications

References 14 publications

Multiple resistance of Conyza sumatrensis to Chlorimuronethyl and to Glyphosate

Multiple resistance of Conyza sumatrensis to Chlorimuronethyl and to Glyphosate

Herbicidas alternativos para controle de biótipos de Conyza bonariensis e C. canadensis resistentes ao glyphosate

Influence of soil water potential in the action of herbicides on goosegrass (Eleusine indica (L) Gaertn)

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