Resistência de plantas daninhas aos herbicidas

Christoffoleti, Pedro Jacob; Filho, Ricardo Victória; Silva, Clóvis B. da

doi:10.1590/s0100-83581994000100003

Cited by 80 publications

(84 citation statements)

References 21 publications

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“…It is necessary to avoid the continuous use of herbicides with the same mechanism of action in the same area, favoring the rotation of mechanisms of action in order to collaborate with the reduction of selection pressure upon the agroecossystem (Christoffoleti et al, 1994). Understanding herbicide efficacy on weed species over time is important because knowledge about this characteristic helps when choosing herbicide rates to obtain the desired residual effect, in case of chemical management in pre-emergence (Carvalho et al, 2005) -especially in sugarcane, given that it is the main weed management tactic used.…”

Section: Resultsmentioning

confidence: 99%

Herbicide efficacy on Borreria densiflora control in pre- and post-emergence conditions

Martins

Christoffoleti

2014

Planta daninha

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-The weed Borreria densiflora is a management issue in soybean and sugarcane crops from North and Northeastern Brazil. Knowledge upon chemical control of B. densiflora contributes to the integrated management of this weed species, especially when active ingredient options become reduced due to the selection of herbicide resistant or tolerant weed species. Experiments in pre-and post-emergence of B. densiflora were conducted in greenhouse, in a randomized block design and four replications. In pre-emergence, the doseresponse curve methodology was used and 7 herbicides were tested. In post-emergence, 9 herbicides at the recommended rate and 4 herbicide mixtures were tested. For pre and post-emergence conditions, evaluations were conducted at 60 and 21 days after treatment (DAT), respectively, and the variables analyzed were weed control and dry weight (%). The results showed options of pre-emergent herbicides that can be used for controlling B. densiflora, especially in sugarcane, where chemical weed control is mainly based on preemergent applications. In the current glyphosate resistance scenario, one should consider the use of pre-emergent herbicides within an integrated management of B. densiflora. For satisfactory post-emergence control, B. densiflora plants should be sprayed at the phenological stage of up to three pairs of leaves. Herbicide mixtures have been and will continue to be an important tool in chemical weed management, broadening the spectrum of weed control, while diversifying herbicide mechanisms of action, which helps to prevent or delay the appearance of herbicide resistance.Keywords: vassourinha-de-botão, chemical control, dose-response, herbicide mixtures, integrated weed management. Palavras-chave: vassourinha-de-botão, controle químico, dose-resposta, mistura de herbicidas, manejo integrado de plantas daninhas. RESUMO -A planta daninhaMARTINS, B

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Section: Resultsmentioning

confidence: 99%

Herbicide efficacy on Borreria densiflora control in pre- and post-emergence conditions

Martins

Christoffoleti

2014

Planta daninha

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“…Management strategies that aim to slow or prevent resistance should be supported through the understanding of Inheritance of resistance to protoporphyrinogen oxidase ... evolutionary and ecological factors driving the selection of resistant populations (Neve et al, 2014). Knowledge of genetic inheritance helps in the understanding of the emergence and evolution of resistance, which allows the selection of management techniques that are intended to prevent or delay its onset (Christoffoleti et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Inheritance of Resistance to Protoporphyrinogen Oxidase Inhibitor Herbicides in Wild Poinsettia

et al. 2016

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-Weed resistance to herbicides is a major global problem for agriculture. In recent years, the increased use of herbicides, without proper planning, has led to a large increase in the number of cases of weed biotypes that are resistant to one or more herbicide mechanism of action. Wild poinsettia biotypes (Euphorbia heterophylla), discovered in the State of Paraná, with resistance to herbicides that inhibit protoporphyrinogen oxidase (PROTOX) and acetolactate synthase (ALS), are the first case to exhibit multiple resistance in Brazil. This study analyzed the genetic inheritance of PROTOX inhibiting herbicide resistance in E. heterophylla. Crosses were conducted between biotypes that were susceptible (female parent) and those carrying multiple resistance to ALS and PROTOX inhibitors (male parent) to obtain the F 1 generation. Backcrosses were performed (RC 1 and RC 2 ) and the F 1 generation was advanced to F 2 . F 1 , F 2 , RC 1 , RC 2 generation plants and their parents were subjected to applications of the herbicide fomesafen (250 g i.a. ha -1 ). The observed frequencies in the F 2 generation were not different from the expected frequency of 3:1. All RC 2 individuals were resistant, while the RC 1 population showed a 1:1 segregation, which would be expected when a single gene controls the trait. Thus, it can be inferred that E. heterophylla resistance to PROTOX-inhibiting herbicides is conditioned by a single and dominant nuclear gene.

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“…Quando se consideram os problemas decorrentes do uso indiscriminado de herbicidas sintéticos (Anaya, 1999;Killham & Foster, 1996) e o aumento sistemático no número de espécies de plantas daninhas resistentes aos atuais produtos no mundo (Vidal & Meroto, 2001; Heap, 1997;Jasieniuk et al, 1996;Christoffoleti et al, 1994;LeBaron, 1991;Holt & LeBaron, 1990), a necessidade de colocar à disposição da agricultura produtos alternativos assume aspecto ainda mais relevante.…”

Section: Introductionunclassified

Análise comparativa dos efeitos alelopáticos das substâncias químicas titonina e titonina acetilada

Filho

Borges

Santos³

2006

Planta daninha

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RESUMO -Este trabalho teve por objetivo estabelecer as variações na atividade alelopática da substância química titonina, em função da acetilação de sua molécula. Bioensaios de germinação (25 o C de temperatura constante e fotoperíodo de 12 horas) e de desenvolvimento da radícula e do hipocótilo (25 o C de temperatura constante e fotoperíodo de 24 horas) foram desenvolvidos. Como planta receptora, utilizou-se a planta daninha Mimosa pudica (malícia). Análise de espectros RMN 1 H e 13 C e técnicas de RMN bidimensionais foram realizadas na molécula acetilada. O processo de acetilação produziu a molécula 3'-acetil-7,4'-dimetoxiflavona, que diferiu da molécula original, identificada como 3'-hidroxi-7,4'-dimetoxiflavona. A estrutura da titonina-Ac foi confirmada pelos espectros de RMN 1 H, 13 C, DEPT, COSY e HETCOR. A titonina foi acetilada com anidrido acético em piridina. A análise comparativa da atividade alelopática das duas substâncias revelou que titonina-Ac apresentou maior potencial para inibir tanto a germinação das sementes como o desenvolvimento da radícula e do hipocótilo da planta daninha malícia. A intensidade dos efeitos alelopáticos das duas substâncias esteve positivamente associada à concentração. O conjunto das informações obtidas permite sugerir a possibilidade de se aumentar a atividade alelopática de uma substância química sem comprometer suas peculiaridades biológicas desejáveis à natureza e aos interesses da sociedade.Palavras-chave: alelopatia, acetilação, estrutura, inibição, molécula. ABSTRACT -The objective of this paper was to establish the variations in the allelopathic

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Resistência de plantas daninhas aos herbicidas

Cited by 80 publications

References 21 publications

Herbicide efficacy on Borreria densiflora control in pre- and post-emergence conditions

Herbicide efficacy on Borreria densiflora control in pre- and post-emergence conditions

Inheritance of Resistance to Protoporphyrinogen Oxidase Inhibitor Herbicides in Wild Poinsettia

Análise comparativa dos efeitos alelopáticos das substâncias químicas titonina e titonina acetilada

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