Comparison of empirical models for predicting yield loss of irrigated rice (Oryza sativa) mixed with Echinochloa spp.

Galon, Leandro; Agostinetto, Dirceu

doi:10.1016/j.cropro.2009.06.005

Cited by 28 publications

(33 citation statements)

References 24 publications

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“…O controle das espécies desse gênero, em lavouras de arroz irrigado, tornou-se prática obrigatória, e geralmente é realizado com herbicidas aplicados em pré ou pós-emergência dessas plantas daninhas ou da cultura (Lopez-Martinez et al, 1997;Concenço et al, 2009;Galon & Agostinetto, 2009). O elevado uso de herbicidas para o controle de plantas daninhas, em arroz irrigado, deve-se à praticidade, à alta eficiência e, principalmente, à dificuldade de uso de outros métodos de controle após a inundação da lavoura, em que se Pesq.…”

Section: Introductionunclassified

“…Os efeitos negativos da infestação do capim-arroz na cultura podem ser atribuídos à alta capacidade de competição com as plantas de arroz por recursos limitantes do meio, à dificuldade de controle, ao aumento do custo de produção, ao acamamento das plantas da cultura, à dificuldade de colheita, à depreciação da qualidade do produto, à hospedagem de pragas, à redução do valor comercial das áreas cultivadas e ao surgimento da resistência a herbicidas (Lopez-Martinez et al, 1997;Andres et al, 2007;Concenço et al, 2009;Galon & Agostinetto, 2009).…”

Section: Introductionunclassified

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Características micromorfológicas de biótipos de capim‑arroz resistente e suscetível ao quinclorac

Ferreira

Concenço

Galon

et al. 2012

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o efeito do quinclorac nas características anatômicas de folhas e raízes de biótipos de capim-arroz (Echinochloa spp.), resistente e suscetível a este herbicida, por meio de avaliações micromorfométricas. As plantas foram cultivadas em vasos de plástico com capacidade de 250 cm 3 . As imagens dos cortes foram obtidas com microscópio de luz equipado com sistema U-Photo, acoplado à câmera digital conectada a microcomputador. Na seção transversal da lâmina foliar e das raízes, utilizouse objetiva de 10X, tendo-se avaliado 20 cortes/campos por planta, com dez medições por corte e quatro repetições por tratamento. Observaram-se diferenças entre os biótipos resistente e suscetível, tanto na ausência quanto na presença do quinclorac. O biótipo resistente apresenta lâmina foliar pouco afetada pelo herbicida; no entanto, há modificação na constituição dos tecidos radiculares com a formação mais acentuada de aerênquima. O biótipo suscetível também apresenta formação de aerênquima quando tratado com o quinclorac, mas em quantidade inferior à observada no biótipo resistente.Termos para indexação: Echinochloa, Oryza sativa, análises micromorfométricas. Micromorphological characteristics of barnyardgrass biotypes resistant and susceptible to quincloracAbstract -The objective of this work was to evaluate the effect of quinclorac on anatomical traits of leaves and roots of barnyardgrass (Echinochloa spp.) biotypes, susceptible and resistant to this herbicide, by micromorphometric assessments. Plants were grown in plastic pots with 250 cm 3 capacity. The images of plant sections were obtained with a light microscope equipped with a U-Photo system, coupled to a digital photo camera connected to a microcomputer. For cross-sections of leaf blades and roots, 10X objectives were used, and 20 sections/fields per plant were evaluated, with ten measurements per section and four replicates per treatment. Differences were observed between resistant and susceptible biotypes, both in the absence and in the presence of quinclorac. The resistant biotype shows leaf blades that are less affected by the herbicide; however, there are changes in root tissue constitution with increased aerenchyma formation. The susceptible biotype also shows formation of aerenchyma when treated with quinclorac, but in lower levels than those observed for the resistant biotype.

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Section: Introductionunclassified

Características micromorfológicas de biótipos de capim‑arroz resistente e suscetível ao quinclorac

Ferreira

Concenço

Galon

et al. 2012

Pesq. agropec. bras.

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“…However, the competitive ability of cultivars can be altered by agronomic practices [32]. Weed population and its emergence delay in relation to the crop, often define the relationships of competition between species [33].…”

Section: Soybean Plants Arrangement and Its Relationship With Weedsmentioning

confidence: 99%

Weed Management in the Soybean Crop

Silva¹,

Galon²,

Aspiazú³

et al. 2013

Soybean - Pest Resistance

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“…In paddy rice these species are directly associated with yield losses (Galon and Agostinetto, 2009) and are the source of indirect economical losses due to increase in production costs and depreciation of cultivated areas and the product harvested (Menezes and Silva, 1998). Weed management is accomplished through physical, chemical, biological and mechanical methods (Zimdahl, 1980).…”

Section: Introductionmentioning

confidence: 99%

Biochemical Alterations of Weeds in Response to Stress Caused by Herbicides and Total Plant Submersion

et al. 2018

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-The maximum biological efficiency of a herbicide is performed when the plants are in favorable condition to absorb and metabolize it. Stress situations, such as total submersion, cause stress in plants, reducing weed control efficiency and crop yield. The objective of this study was to verify whether different soil water content and herbicide treatments alter the components of the secondary metabolism and cause cellular damage in weed species Two experiments were conducted (I and II) in a completely randomized experimental design with a factorial scheme (2 x 2 x 4 and 2 x 5, respectively) and three replicates. The first experiment was conducted with two species (Leersia hexandra and Luziola peruviana), which were submitted to four herbicide treatments and soil moisture levels (field capacity and total submersion). Experiment II was performed with cockspur grass plants submitted to five herbicide treatments and the same soil moisture levels from experiment I. Leaf samples were collected for laboratory analyses seven days after establishing the soil moisture levels. Assessmentes were made for the levels of chlorophyll and carotenoids, activity of antioxidant enzymes, as well as levels of hydrogen peroxide and cellular damage. The results showed that all plant species studied showed higher oxidative stress under field capacity than under submersion. L. hexandra shows greater oxidative stress than L. peruviana regardless of the treatment applied: water regime or herbicide. Furthermore, the associations of glyphosate + clomazone and glyphosate + mixture of imazapyr + imazapic caused greater oxidative stress in L. hexandra and L. peruviana than glyphosate alone. All herbicides caused lipid peroxidation, reduced enzyme activity decreased concentrations of total chlorophyll, chlorophyll a and carotenoids on cockspur grass. Keywords: Luziola peruviana, Leersia hexandra, Echinochloa crus-galli,oxidative stress, chemical control. RESUMO -

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Comparison of empirical models for predicting yield loss of irrigated rice (Oryza sativa) mixed with Echinochloa spp.

Cited by 28 publications

References 24 publications

Características micromorfológicas de biótipos de capim‑arroz resistente e suscetível ao quinclorac

Características micromorfológicas de biótipos de capim‑arroz resistente e suscetível ao quinclorac

Weed Management in the Soybean Crop

Biochemical Alterations of Weeds in Response to Stress Caused by Herbicides and Total Plant Submersion

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