Interaction of glyphosate with auxin herbicides for control of Benghal dayflower (Commelina benghalensis) at advanced growth stages
Auxinic herbicides are the second most-used herbicides in Brazil, and are often combined with glyphosate in pre-plant burndowns management. However, efficacy of these herbicides against Benghal dayflower at advanced growth stages remains poorly understood. Two field experiments were conducted in 202...
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Cambridge University Press
2025-01-01
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| Series: | Weed Technology |
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| Online Access: | https://www.cambridge.org/core/product/identifier/S0890037X25000235/type/journal_article |
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| author | Willian F. Larini Alfredo Junior P. Albrecht Debora C. Neuberger Arthur A.M. Barroso Leandro P. Albrecht |
| author_facet | Willian F. Larini Alfredo Junior P. Albrecht Debora C. Neuberger Arthur A.M. Barroso Leandro P. Albrecht |
| author_sort | Willian F. Larini |
| collection | DOAJ |
| description | Auxinic herbicides are the second most-used herbicides in Brazil, and are often combined with glyphosate in pre-plant burndowns management. However, efficacy of these herbicides against Benghal dayflower at advanced growth stages remains poorly understood. Two field experiments were conducted in 2021 and 2022 on no-till fields naturally infested with Benghal dayflower at an advanced growth stage (approximately 50 cm height, 100% soil coverage) to evaluated the control efficacy of 2,4-D at 966 g ae ha−1, triclopyr at 720 g ae ha−1, fluroxypyr at 400 g ae ha−1, and dicamba at 720 g ae ha−1, alone or in combination with glyphosate (1,550 g ae ha−1). Dicamba was also tested at rates from 288 to 1,008 g ae ha−1. Results indicate that Benghal dayflower exhibits variable responses to auxin herbicides, and is influenced by both chemical family and the herbicide molecule. None of the treatments provided complete control at 8 wk after application (WAA). The highest visible control (∼77%) and dry mass reduction (∼57%) were provided by triclopyr (applied alone or combined with glyphosate) and 2,4-D (combined with glyphosate), followed by fluroxypyr (alone or combined with glyphosate) and 2,4-D (alone), providing approximately 69% visible control and 54% dry mass reduction. Even when statistical differences were detected by adding glyphosate to auxin herbicides, these differences were not sufficient to characterize a synergistic effect or improve control consistency. Dicamba (isolated or combined with glyphosate) provided the lowest control (∼54%) and dry mass reduction (∼30%). Additionally, dicamba doses up to 1,008 g ae ha−1 did not provide complete control (∼60% visible control and 51% dry mass reduction), suggesting that dicamba limitations cannot be mitigated through a dose increase. By highlighting the challenges in controlling Benghal dayflower at advanced growth stages, these results emphasize the importance of early-stage weed control and the need to carefully assess which auxin herbicides to use and when glyphosate mixtures are necessary. |
| format | Article |
| id | doaj-art-fd97c02e89e243968cebe5d44d51a2b3 |
| institution | Kabale University |
| issn | 0890-037X 1550-2740 |
| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-fd97c02e89e243968cebe5d44d51a2b32025-08-20T03:31:49ZengCambridge University PressWeed Technology0890-037X1550-27402025-01-013910.1017/wet.2025.23Interaction of glyphosate with auxin herbicides for control of Benghal dayflower (Commelina benghalensis) at advanced growth stagesWillian F. Larini0https://orcid.org/0000-0003-1663-7965Alfredo Junior P. Albrecht1https://orcid.org/0000-0002-8390-3381Debora C. Neuberger2https://orcid.org/0000-0002-0923-6699Arthur A.M. Barroso3https://orcid.org/0000-0001-7687-1396Leandro P. Albrecht4https://orcid.org/0000-0003-3512-6597Ph.D. Student, Federal University of Paraná, Curitiba, Paraná, BrazilProfessor, Federal University of Paranins, Palotina, Paraná, BrazilUndergraduate student, Federal University of Paraná, Palotina, Paraná, BrazilProfessor, Federal University of Paraná, Curitiba, Paraná, BrazilProfessor, Federal University of Paranins, Palotina, Paraná, BrazilAuxinic herbicides are the second most-used herbicides in Brazil, and are often combined with glyphosate in pre-plant burndowns management. However, efficacy of these herbicides against Benghal dayflower at advanced growth stages remains poorly understood. Two field experiments were conducted in 2021 and 2022 on no-till fields naturally infested with Benghal dayflower at an advanced growth stage (approximately 50 cm height, 100% soil coverage) to evaluated the control efficacy of 2,4-D at 966 g ae ha−1, triclopyr at 720 g ae ha−1, fluroxypyr at 400 g ae ha−1, and dicamba at 720 g ae ha−1, alone or in combination with glyphosate (1,550 g ae ha−1). Dicamba was also tested at rates from 288 to 1,008 g ae ha−1. Results indicate that Benghal dayflower exhibits variable responses to auxin herbicides, and is influenced by both chemical family and the herbicide molecule. None of the treatments provided complete control at 8 wk after application (WAA). The highest visible control (∼77%) and dry mass reduction (∼57%) were provided by triclopyr (applied alone or combined with glyphosate) and 2,4-D (combined with glyphosate), followed by fluroxypyr (alone or combined with glyphosate) and 2,4-D (alone), providing approximately 69% visible control and 54% dry mass reduction. Even when statistical differences were detected by adding glyphosate to auxin herbicides, these differences were not sufficient to characterize a synergistic effect or improve control consistency. Dicamba (isolated or combined with glyphosate) provided the lowest control (∼54%) and dry mass reduction (∼30%). Additionally, dicamba doses up to 1,008 g ae ha−1 did not provide complete control (∼60% visible control and 51% dry mass reduction), suggesting that dicamba limitations cannot be mitigated through a dose increase. By highlighting the challenges in controlling Benghal dayflower at advanced growth stages, these results emphasize the importance of early-stage weed control and the need to carefully assess which auxin herbicides to use and when glyphosate mixtures are necessary.https://www.cambridge.org/core/product/identifier/S0890037X25000235/type/journal_articleDicambafluroxypyrglyphosatetriclopyr2,4-DBenghal dayflower Commelina Benghalensis LBurndownpostemergencemixturetriclopyr2,4-D |
| spellingShingle | Willian F. Larini Alfredo Junior P. Albrecht Debora C. Neuberger Arthur A.M. Barroso Leandro P. Albrecht Interaction of glyphosate with auxin herbicides for control of Benghal dayflower (Commelina benghalensis) at advanced growth stages Weed Technology Dicamba fluroxypyr glyphosate triclopyr 2,4-D Benghal dayflower Commelina Benghalensis L Burndown postemergence mixture triclopyr 2,4-D |
| title | Interaction of glyphosate with auxin herbicides for control of Benghal dayflower (Commelina benghalensis) at advanced growth stages |
| title_full | Interaction of glyphosate with auxin herbicides for control of Benghal dayflower (Commelina benghalensis) at advanced growth stages |
| title_fullStr | Interaction of glyphosate with auxin herbicides for control of Benghal dayflower (Commelina benghalensis) at advanced growth stages |
| title_full_unstemmed | Interaction of glyphosate with auxin herbicides for control of Benghal dayflower (Commelina benghalensis) at advanced growth stages |
| title_short | Interaction of glyphosate with auxin herbicides for control of Benghal dayflower (Commelina benghalensis) at advanced growth stages |
| title_sort | interaction of glyphosate with auxin herbicides for control of benghal dayflower commelina benghalensis at advanced growth stages |
| topic | Dicamba fluroxypyr glyphosate triclopyr 2,4-D Benghal dayflower Commelina Benghalensis L Burndown postemergence mixture triclopyr 2,4-D |
| url | https://www.cambridge.org/core/product/identifier/S0890037X25000235/type/journal_article |
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