Chemical control of multiple herbicide-resistant Amaranthus: A review

Braz, Guilherme Braga Pereira; Takano, Hudson Kagueyama

doi:10.51694/advweedsci/2022;40:amaranthus009

Cited by 8 publications

(5 citation statements)

References 53 publications

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“…In this context, the use of combinations between glyphosate and auxin-mimicking herbicides (e.g., 2,4-D amine) may constitute an interesting alternative to be implemented at the time of pre-sowing burndown, since this combination between herbicides has already had its efficacy proven for another species of the same genus (Amaranthus palmeri) with resistance to glyphosate (GONÇALVES NETTO et al, 2019;BRAZ;TAKANO, 2022). In addition, the results found in the present study prove the existence of this possible synergistic effect for the combinations between glyphosate potassium salt and the herbicide 2,4-D amine in the control of A. hybridus, since there were increments in the levels of weed control when these combinations were used, compared with the values found when the glyphosate-based products were applied alone.…”

Section: Resultsmentioning

confidence: 99%

Performance of glyphosate-based products applied alone and in combination with herbicides in burndown

Pereira,

Braz,

Souza

et al. 2023

Rev. Caatinga

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The no-tillage system is a conservation system that helps sustainability and agricultural production. The effectiveness of glyphosate control, applied alone or in combination with other herbicides, can be altered depending on the product’s formulation. The objective of the present study was to evaluate the effectiveness of glyphosate in formulations containing different salts and concentrations, applied alone and in combination with other herbicides, in controlling weeds in advanced stages in the pre-sowing burndown operation. The experiment was carried out in the field in an area with a history of high weed infestation. The experiment was conducted in a randomized block design, evaluating eleven treatments and four replicates. The treatments consisted of the application of three glyphosate-based formulations alone and in combination with clethodim and 2,4-D amine herbicides, in addition to a control without herbicide application. The evaluated variables were percentage of weed control and percentage of desiccation. A comparison of means by contrasts was performed to analyze the percentage of weed control. In general, treatments containing products based on glyphosate potassium salt in the composition have slightly better control performance compared to those consisting of glyphosate isopropylamine salt.

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Section: Resultsmentioning

confidence: 99%

Performance of glyphosate-based products applied alone and in combination with herbicides in burndown

Pereira,

Braz,

Souza

et al. 2023

Rev. Caatinga

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“…herbicide resistant (Yanniccari et al, 2023). Therefore, rotation and combination of herbicides, as well as integration with non-chemical measures, are essential for controlling and preventing the selection of resistant biotypes (Braz and Takano, 2022;Soltani et al, 2023). The combination of preand post-emergence herbicide application with a population of 247,000 soybean plants ha -1 was advantageous in the management of Amaranthus spp.…”

Section: Resultsmentioning

confidence: 99%

Amaranthus hybridus L. RESISTANT TO GLYPHOSATE AND CHLORIMURON IN PARAGUAY

Furlan Kashivaqui,

Krzyzaniak,

Pires

et al. 2023

Chil. j. agric. anim. sci.

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Amaranthus species are extremely problematic weeds due to their aggressiveness and resistance, being Amaranthus palmeri S. Watson, Amaranthus retroflexus L., Amaranthus tuberculatus (Moq.) J. D. Sauer, and Amaranthus hybridus L. prominent worldwide. The present research aimed to study A. hybridus populations in Paraguay where the use of glyphosate and chlorimuron herbicides presented management challenges. This research was conducted in the municipalities of Corpus Christi and Hernandarias, Paraguay, in 2016, 2017, 2018, 2019, and 2020. Weed seeds with resistance indicators were collected, cultivated, and following a screening process, cultivated for seed production (heritability up to F2), and the seeds were collected to obtain the herbicide dose-response curve. The herbicides glyphosate and chlorimuron were tested in portions of 1-8, 1-4, 1-2, 1, 2, 4, and 8 times the recommended dose on the package inserts (720 g acid equivalent (ae) ha 1 and 20 g active ingredient (ai) ha1, respectively). Among the A. hybridus populations evaluated in Paraguay, biotype from Hernandarias with multiple resistance to ALS-inhibiting (HRAC 2) and EPSPs-inhibiting (HRAC 9) herbicides, and biotype from Corpus Christi with resistance to ALS-inhibiting herbicides (HRAC 2) were found. Therefore, rotation and combination of herbicides, as well as integration with non-chemical measures, are essential to control and prevent selection of resistant biotypes. Studies aimed to develop integrated weed management plans are essential for effective control. In countries like Paraguay, this becomes imperative because of the lack of research on this topic.

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“…The herbicide-resistant weed challenge increases when the populations evolve resistance to herbicides with different MoAs [12]. Auxin-mimicking herbicides remain one of the groups of herbicides least prone to the evolution of resistance [4,32].…”

Section: Discussionmentioning

confidence: 99%

“…Despite the low to medium risk of glyphosate resistance evolution [9,10], the widespread and repeated use of this herbicide has led to a selection of weeds that have become resistant to glyphosate [11]. The challenge of controlling herbicide-resistant weeds increases when the evolution of multiple resistance emerges in response to the repetitive use of herbicides with the same site of action to manage the weeds' resistance to other sites of action [12].…”

Section: Introductionmentioning

confidence: 99%

Convergent Adaptation of Multiple Herbicide Resistance to Auxin Mimics and ALS- and EPSPS-Inhibitors in Brassica rapa from North and South America

Domínguez-Valenzuela

Palma-Bautista

Vázquez-García

et al. 2023

Plants

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Herbicide-resistant weeds have been identified and recorded on every continent where croplands are available. Despite the diversity of weed communities, it is of interest how selection has led to the same consequences in distant regions. Brassica rapa is a widespread naturalized weed that is found throughout temperate North and South America, and it is a frequent weed among winter cereal crops in Argentina and in Mexico. Broadleaf weed control is based on glyphosate that is used prior to sowing and sulfonylureas or mimic auxin herbicides that are used once the weeds have already emerged. This study was aimed at determining whether a convergent phenotypic adaptation to multiple herbicides had occurred in B. rapa populations from Mexico and Argentina by comparing the herbicide sensitivity to inhibitors of the acetolactate synthase (ALS), 5-enolpyruvylshikimate-3-phosphate (EPSPS), and auxin mimics. Five B. rapa populations were analyzed from seeds collected in wheat fields in Argentina (Ar1 and Ar2) and barley fields in Mexico (Mx1, Mx2 and MxS). Mx1, Mx2, and Ar1 populations presented multiple resistance to ALS- and EPSPS-inhibitors and to auxin mimics (2,4-D, MCPA, and fluroxypyr), while the Ar2 population showed resistance only to ALS-inhibitors and glyphosate. Resistance factors ranged from 947 to 4069 for tribenuron-methyl, from 1.5 to 9.4 for 2,4-D, and from 2.7 to 42 for glyphosate. These were consistent with ALS activity, ethylene production, and shikimate accumulation analyses in response to tribenuron-methyl, 2,4-D, and glyphosate, respectively. These results fully support the evolution of the multiple- and cross-herbicide resistance to glyphosate, ALS-inhibitors, and auxinic herbicides in B. rapa populations from Mexico and Argentina.

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Chemical control of multiple herbicide-resistant Amaranthus: A review

Cited by 8 publications

References 53 publications

Performance of glyphosate-based products applied alone and in combination with herbicides in burndown

Performance of glyphosate-based products applied alone and in combination with herbicides in burndown

Amaranthus hybridus L. RESISTANT TO GLYPHOSATE AND CHLORIMURON IN PARAGUAY

Convergent Adaptation of Multiple Herbicide Resistance to Auxin Mimics and ALS- and EPSPS-Inhibitors in Brassica rapa from North and South America

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