Glyphosate doses should be lower for shaded environments: light and the sensitivity of
            <i>Euphorbia heterophylla</i>

Ferreira, Guilherme Augusto de Paiva; Montes, William Gomes; Donato, Luan Mateus Silva; Faria, R.M.; Santos, Leonardo David Tuffi

doi:10.1080/09670874.2022.2056254

Cited by 6 publications

(4 citation statements)

References 59 publications

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“…Increased sensitivity in shading to glyphosate applied alone was also observed in Euphorbia heterophylla [20] and Merremia cissoides [21], and the mixture of glyphosate and carfentrazone-ethyl in Macroptilium atropurpureum [66]. Unlike what was observed in the present study, where no increase in the e ciency of carfentrazone-ethyl isolated under shading was found, Santos Júnior [22] found an increase in sa ufenacil e ciency, another protox-inhibiting herbicide, in controlling Commelina benghalensis.…”

Section: Discussionsupporting

confidence: 54%

“…The mixture of glyphosate with protox-inhibiting herbicides has an additive and synergistic effect on the control of several species of broadleaf and grass weeds [37][38][39]. However, shading can interfere with the herbicide mixture's e ciency since the morphological and physiological plants characteristics [40][41][42][43][44] and herbicides e ciency when applied alone are altered under low light intensity [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Both products have been used in eucalyptus plantations to control weeds between the rows, even mixed in the tank as an alternative to increasing the control spectrum. In shaded environments, a condition commonly found under the canopies of eucalyptus planted forests [19], some weeds are more sensitive to glyphosate action, such as Euphorbia heterophylla [20] and Merremia cissoides [21] and protox-inhibiting herbicides, such as Commelina benghalensis [22], and can be controlled with lower doses of these products. The herbicides application in lower doses with high control e ciency, as occurs in shading, helps to reduce the negative impacts of these pesticides on the environment, which is currently so questioned by society [23][24][25][26][27][28][29], in addition to reducing production costs.…”

Section: Introductionmentioning

confidence: 99%

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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. 2023

Preprint

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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 3x6 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. 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 management. In the environment of 63% shading, the dose of 768 + 24 g ha− 1 was also efficient in this species management. 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, reducing costs and environmental impacts.

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Section: Discussionsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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. 2023

Preprint

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“…The higher sensitivity of U. brizantha and Meghatirsus maximus to glyphosate in an environment with 50% light restriction, compared to plants kept in full sun, was reported Brant et al (2018). The higher sensitivity to glyphosate by weeds grown in shaded environments, compared to plants kept in full sun, was also observed for Commelina benghalensis , Macroptilium atropurpureum (Costa et al, 2020), Cyperus rotundus , Merremia cissoides (Ferreira et al, 2022a), and for Euphorbia heterophylla (Ferreira et al, 2022b) corroborating what was found in the present study. Research, Society and Development, v. 11, n. 17, e177111738758, 2022 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.…”

Section: Discussionmentioning

confidence: 74%

Luminous restriction and chemical control with glyphosate in integrated management of Urochloa brizantha L.

Silva

Santos²,

Donato³

et al. 2022

RSD

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The objective was to evaluate the effect of different light conditions in the cultivation environment on the control of U. brizantha by glyphosate. The experimental design was in a plot scheme divided into randomized blocks with five replications. In the plots, environments with light conditions were allocated: full sun, intermittent shading with 3 hours of sun/day, and continuous shading. In the subplots, the herbicide doses: 0, 480, 960, and 1440 g. a. e. glyphosate ha-1 applied to U. brizantha plants. The control of U. brizantha by the herbicide glyphosate was more efficient in shaded environments, either with continuous or intermittent shading, in relation to full sun, indicating that the conditions of light influenced the action of the herbicide. At 35 DAA, control values of U. brizantha above 80% were observed from the 765 g. a. e ha-1 dose of glyphosate for treatments with shading. Already in conditions of full sun, 65% of control values were reached in the highest dose, which is considered unsatisfactory for the management of this species. U. brizantha submitted to light restriction had the content of epicuticular wax, starch, soluble and total sugar reduced; however, the leaf area was larger in these environments compared to full sun. The reserve content, epicuticular wax, and leaf area variables are affected by shading with a direct relationship with the greater control of U. brizantha by glyphosate in this cultivation condition.

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S‐metolachlor in pre‐emergence reduces the leaf cuticular wax and increases the efficiency of glyphosate

Files,

Viana,

Camargo

et al. 2024

Pest Management Science

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BACKGROUNDThe low glyphosate uptake capacity, possibly due to the lipophilic character of epicuticular wax on leaves, may contribute to the natural tolerance of some weed species. The use of pre‐emergence herbicides like S‐metolachlor, which inhibits very‐long‐chain fatty acid synthesis, might enhance glyphosate's post‐emergent efficacy against hard‐to‐control weeds, such as Euphorbia heterophylla L. (milkweed) and Ipomoea triloba L. (littlebell). This study aimed to determine whether S‐metolachlor affects glyphosate's efficacy and its impact on epicuticular wax production in these species. In Experiment 1, milkweed was 2.27 times more tolerant to S‐metolachlor than littlebell, with GR50 values of 1024.6 g ai ha−1 and 451.2 g ai ha−1, respectively. In Experiment 2, S‐metolachlor enhanced glyphosate efficacy in both species. For littlebell, S‐metolachlor increased glyphosate efficacy by 28% at 21 days after treatment (DAT), while milkweed boosted control to 61%, compared to 45% in untreated plants. The herbicide accelerated glyphosate's action, particularly at lower doses. In Experiment 3, S‐metolachlor reduced epicuticular wax by up to 47% in littlebell and 45% in milkweed during early growth. Wax levels remained lower in treated plants, contributing to improved glyphosate efficacy.CONCLUSIONS‐metolachlor in pre‐emergence reduces the amount of wax deposited in the leaf surface, increasing glyphosate efficiency in both species, especially at the beginning of the phenological stage. © 2024 Society of Chemical Industry.

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Glyphosate doses should be lower for shaded environments: light and the sensitivity of Euphorbia heterophylla

Cited by 6 publications

References 59 publications

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

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

Luminous restriction and chemical control with glyphosate in integrated management of Urochloa brizantha L.

S‐metolachlor in pre‐emergence reduces the leaf cuticular wax and increases the efficiency of glyphosate

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