Controle de Macroptilium lathyroides com herbicidas aplicados em pré e pós-emergência

Concenço, Germani; Andrés, A.; Galon, Leandro; Pontes, Cristiano Silva; Correia, Vinicius Talhari

doi:10.7824/rbh.v11i1.144

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…The increase in the accumulation of shikimate and in the absorption, cell penetration, and translocation of glyphosate as a result of adding herbicides that inhibit PPO may explain the increased efficacy of the mixture glyphosate + carfentrazoneethyl under full sunlight conditions. Concenço et al (2012) observed that the application of glyphosate alone was effective in the control of weeds even when it was performed at a later stage; however, carfentrazone-ethyl was only effective when applied after initial emergence. In the present study, the herbicides were applied whilst the plants were budding, which may be the reason for the poor control of M. atropurpureum observed when carfentrazone-ethyl was applied.…”

Section: Resultsmentioning

confidence: 99%

Levels of shading and application of glyphosate and carfentrazone-ethyl in the control of Macroptilium atropurpureum

Costa

Santos

Ferreira

et al. 2018

Rev. bras. eng. agríc. ambient.

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Variations in environmental conditions, such as the availability of light, can affect the efficacy of herbicides because they alter the biological characteristics of plants including those that are related to the plant’s sensitivity to herbicides. Therefore, the objective of the present study was to assess the influence of environments with different light availabilities, and of the application of glyphosate and carfentrazone-ethyl (separately or in combination) on the morphophysiology and control of Macroptilium atropurpureum. An experimental design of randomized blocks with five replicates was used, with treatments arranged in a split-plot design. The plots were composed of three levels of shading (full sunlight, 50% shading, and 70% shading); within each plot there were sub-plots, one for each of the two herbicides (glyphosate and carfentrazone-ethyl), used either separately or in combination. The doses of glyphosate + carfentrazone-ethyl applied in the treatments were 0+40 g ha-1 of carfentrazone-ethyl, 1.440+0 g ha-1 of glyphosate, 1.080+30 g ha-1 of glyphosate + carfentrazone-ethyl, and there was an additional treatment that did not include the application of an herbicide. Plants of M. atropurpureum cultivated under shading exhibited higher sensitivity to the herbicides, greater leaflet area, and lower photosynthetic rates than plants cultivated under full sunlight conditions. Under shading, both herbicides applied separately or in combination were effective in controlling M. atropurpureum, which indicates a greater susceptibility of this species to these herbicides in environments with light restriction. The species was tolerant to the two tested herbicides, used either alone or in combination, when grown under full sunlight conditions.

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Section: Resultsmentioning

confidence: 99%

Levels of shading and application of glyphosate and carfentrazone-ethyl in the control of Macroptilium atropurpureum

Costa

Santos

Ferreira

et al. 2018

Rev. bras. eng. agríc. ambient.

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“…It is characterized as a legume with great nitrogen fixing capacity, and can be used as green fertilizer (Lorenzi, 2000); In several regions of Brazil it is used as forage for grazing (Vasconcelos et al, 2011). However, M. lathyroides has become a problematic invasive plant for soybean and maize crops and pasture areas (Concenço et al, 2012), due to its characteristics of adaptability to different environments and short reproductive cycle.…”

Section: Introductionmentioning

confidence: 99%

Cytotoxic and Genotoxic Effects of Macroptilium lathyroides

et al. 2018

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The monitoring of phytochemicals with potentially toxic properties can be assessed by observing the physiological and cellular alterations of the test organism exposed. This present study aimed to evaluate the cytotoxic and genotoxic potential of aqueous extracts of leaves and roots of Macroptilium lathyroides weed on the cell cycle of lettuce. Bioassays were conducted in a germinator (25 oC) with aqueous extract at concentrations of 0, 5, 10, 20 and 40% p v-1, obtained from fresh leaves and roots. For biological, lettuce root meristems were used for the preparation of slides using the technique of squashing. All blades were observed with an optical microscope at a magnitude of 400x. A total of 5,000 cells were analyzed for each treatment, and the number of cells in each phase of mitosis was recorded. Possible presence of chromosomal abnormalities was verified, such as chromatid breaks, anafasic bridges, loss of whole chromosomes or micronuclei formation. These analyzes were conducted only on a qualitative level. Results showed that aqueous extracts of M. lathyroides mitotic caused reduced index with increased concentration. Genotoxic activity was also observed for both extracts tested, since composition resulted in cell cycle changes and chromosomal abnormalities.

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Control of Digitaria insularis (L.) Fedde in eucalyptus forests: shading increases sensitivity to glyphosate applied alone and in a mixture with carfentrazone-ethyl

Ferreira,

Donato,

Montes

et al. 2024

Discov Agric

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Shading, the predominant condition in most of the eucalyptus cultivation cycle, causes changes in the morphological and physiological weed's characteristics, which can alter their responses to glyphosate and carfentrazone-ethyl, important herbicides for the crop. The objective was to evaluate the influence of light on the efficiency of glyphosate and carfentrazone-ethyl used alone and in a mixture in Digitaria insularis control, a priority pest in the crop. The experiment was carried out in a 3 × 6 factorial scheme. The first factor corresponded to 3 cultivation environments (full sunlight, 45 and 63% shading) and the second factor to doses of glyphosate and carfentrazone-ethyl applied isolated (1920 and 40 g ai ha−1) and mixed (1536 + 8; 1152 + 16; 768 + 24 and 384 + 32 g ai ha−1), respectively. Shading increased D. insularis sensitivity to glyphosate alone and in a mixture with carfentrazone-ethyl. In shading, the glyphosate application alone at a dose of 1920 g ha−1 and in a mixture with carfentrazone-ethyl at doses of 1536 + 8 and 1152 + 16 g ha−1 were efficient in D. insularis control. In the environment of 63% shading, the dose of 768 + 24 g ha−1 was also efficient in this species control. None of the doses were effective in controlling D. insularis in full sunlight. Isolated carfentrazone-ethyl was inefficient in controlling D. insularis, regardless of the growth environment. Shading increases the quantum yield of photosystem II and reduces the electron transport rate, photosynthetic rate, stomatal conductance, and transpiration rate of D. insularis. In shady environments, it is possible to control D. insularis with lower glyphosate doses, used alone and mixed with carfentrazone-ethyl.

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Controle de Macroptilium lathyroides com herbicidas aplicados em pré e pós-emergência

Cited by 4 publications

References 8 publications

Levels of shading and application of glyphosate and carfentrazone-ethyl in the control of Macroptilium atropurpureum

Levels of shading and application of glyphosate and carfentrazone-ethyl in the control of Macroptilium atropurpureum

Cytotoxic and Genotoxic Effects of Macroptilium lathyroides

Control of Digitaria insularis (L.) Fedde in eucalyptus forests: shading increases sensitivity to glyphosate applied alone and in a mixture with carfentrazone-ethyl

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