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Artigos e Textos

Modeling the Population Dynamics and Management of Italian Ryegrass under Two Climatic Scenarios in Brazil

Italian ryegrass (Lolium multiflorum L.) is an annual grass widely distributed in cultivated crops around the world. This weed causes significant yield reduction in many crops and has developed herbicide resistance. The aim of this study was to develop a cohort-based stochastic population dynamics model that integrates both emergence (thermal time) and dynamic population models as a tool to simulate the population dynamics of susceptible and resistant populations of L. multiflorum under the effects of climate...

Multiple resistance to glyphosate and imazethapyr in Bidens subalternans

Glyphosate has been widely used to control greater beggarticks populations that are resistant to acetolactate synthase (ALS) inhibitors in South America. However, herbicide control failures has been observed over the last three growing seasons in grain production areas of Paraguay. In this research, we report the first case of multiple resistance to glyphosate (EPSPs) and imazethapyr (ALS) in greater beggarticks (Bidens subalternans) population from Paraguay...

Comitês Frac-BR, Hrac-BR e Irac-BR intensificam no Brasil as ações no combate à resistência de doenças, plantas daninhas e insetos às táticas de controle

Em ambientes tropicais como o Brasil, o manejo eficiente de doenças, plantas daninhas e insetos pragas é fundamental para se atingir bons resultados de produtividade dos cultivos. Mas para garantir a eficiência a longo prazo das estratégias de manejo atualmente disponíveis, algumas boas práticas agrícolas devem ser implementadas. Para isso, é necessário entender um pouco mais sobre quais são...

Weed resistance to synthetic auxin herbicides

Herbicides classified as synthetic auxins have been most commonly used to control broadleaf weeds in a variety of crops and in non-cropland areas since the first synthetic auxin herbicide (SAH), 2,4-D, was introduced to the market in the mid-1940s. The incidence of weed species resistant to SAHs is relatively low considering their long-term global application with 30 broadleaf, 5 grass, and...

Resistência de plantas, doenças e pragas a produtos é preocupante

Para debater as particularidades que devem ser consideradas na escolha de práticas preventivas ou mitigadoras da resistência e a implantação de um programa de manejo regional será realizado o II Seminário Mato-grossense sobre Manejo de Resistência, que ocorre dias 23 e 24 de julho, no auditório da FAMATO, em Cuiabá.

Population Interference of Glyphosate Resistant and Susceptible Ryegrass on Eucalyptus Initial Development

The repetitive use of herbicides with the same mechanism of action causes the selection of resistant weeds, such as ryegrass. Considering the occurrence of ryegrass (Lolium multiflorum) in eucalyptus, a crop on which glyphosate is used, it is necessary to study its interference. The objective of this study was to evaluate the effect of densities (0, 10, 20, 30 and 50 plants m-2) of two ryegrass...

HRAC-BR define prioridades de 2018 e próximos anos

Com foco nas atividades de 2018 e próximos anos, a Associação Brasileira de Ação à Resistência de Plantas Daninhas aos Herbicidas (HRAC-BR), realizou a sua primeira assembleia-geral ordinária do ano de 2018, no início do mês de março, na Estação Experimental BASF, em Santo Antônio de Posse, São Paulo. O principal destaque da assembleia foi a revisão do Estatuto da Associação e...

Forage plants and weed that are sensitive to atmospheric clomazone residuals

The use of indicator plants can be an effective alternative in monitoring the presence of toxic molecules in the air, such as herbicides. Thus, in the goal of this study is to assess the sensitivity of forage plants and weeds to atmospheric residual concentrations of clomazone. The treatments were arranged in a 6x5 factorial scheme, with the first factor corresponding to the plant species...

Multiple resistance to ACCase and ALS-inhibiting herbicides in Beckmannia syzigachne (Steud.) Fernald without mutations in the target enzymes

American slough grass (Beckmannia syzigachne (Steud.( Fernald) is a worldwide weed and is widely distributed in rice-wheat rotations in China. Fenoxaprop-P-ethyl and mesosulfuron-methyl are two major herbicides used to control B. syzigachne. Resistance has evolved in B. syzigachne under continuous selective pressure from herbicides. This study aimed to establish the cross-resistance pattern of...

Resistance level and target-site mechanism to fenoxaprop- p -ethyl in Beckmannia syzigachne (Steud.) Fernald populations from China

Beckmannia syzigachne (Steud.) Fernald is one of the main grass weeds severely harming wheat (Triticum aestivum L.) production in rice-wheat areas in China. Fenoxaprop-p-ethyl is the main herbicide used to selectively control grass weed in China. Beckmannia syzigachne has evolved resistance to fenoxaprop-p-ethyl due to continuous application. To investigate fenoxaprop-p-ethyl resistant level and...

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Comitê de Ação a Resistência aos Herbicidas

HRAC-BR - 2020

Desenvolvido por Allge Pesquisa e Desenvolvimento