Monitoring Glyphosate- and Chlorimuron- resistant Conyza spp. Populations in Brazil

Mendes, Rafael Romero; Takano, Hudson Kagueyama; Netto, Acácio Gonçalves; Picoli, Gilmar José; Cavenaghi, A.L.; Silva, Vanessa F.V.; Nicolai, Marcelo; Christoffoleti, Pedro Jacob; Oliveira, Rubem Silvério de; Melo, Maria Luísa Pereira de; Ovejero, R. F. Lopez

doi:10.1590/0001-3765202120190425

Cited by 10 publications

(11 citation statements)

References 30 publications

(29 reference statements)

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“…Although several Erigeron populations have been selected for resistance to ALS inhibitors, mainly in Paraná [1], the resistance mechanism has not yet been investigated. It is worth mentioning that different patterns of cross-resistance may occur, depending on the selection pressure imposed at each location, and this may result in the evolution of different resistance mechanisms [1]. In addition, the absence of patterns among populations of Erigeron spp.…”

Section: Discussionmentioning

confidence: 99%

“…The experiments were conducted in a 2 × 8 factorial design, in which the first factor was constituted by the two populations of E. sumatrensis (R and S) and the second factor consisted of 8 herbicides doses. The doses were proportionally arranged: 0, 1/8, 1/4, 1 2 , 1, 2, 4, and 8 times the recommended dose of each herbicide. For chlorimuron-ethyl, the recommended dose adopted was 20 g a.i.…”

Section: Whole-plant Dose-response Relationshipmentioning

confidence: 99%

“…Weeds known as horseweed or fleabane belong to the genus Erigeron (synonym Conyza). Three Erigeron species are commonly found across South America territories: Erigeron bonariensis (L.) Cronquist, Erigeron sumatrensis (L.) Cronquist, and Erigeron canadensis (L.) Cronquist [1]. To date, many studies in the literature report Sumatran fleabane (Erigeron sumatrensis) as the most frequent species infesting soybean fields in Southern Brazil [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the evolution of multiple resistances (glyphosate and ALS) was rapidly reported in at least five populations from Paraná in 2012 [9]. Currently, at least 41% of all Erigeron populations are considered multiple resistant to both modes of action [1].…”

Section: Introductionmentioning

confidence: 99%

“…The combination of chlorimuron-ethyl and glyphosate has been largely used for burndown applications prior to summer crops by Brazilian farmers. Cloransulam-methyl (methyl 3-chloro-2[[(5-ethoxy-7-fluoro [1,2,4]triazolo [1,5-c]pyrimidin-2-yl) sulfonyl]amino] benzoate is part of the chemical family TRI. As with chlorimuron-ethyl, cloransulam-methyl can also be sprayed in PRE, PPI, and POST.…”

Section: Introductionmentioning

confidence: 99%

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A Target-Site Mutation Confers Cross-Resistance to ALS-Inhibiting Herbicides in Erigeron sumatrensis from Brazil

Silva

Mendes

Suzukawa

et al. 2022

Plants

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Cases of weed resistant to herbicides have changed the dynamics of agricultural areas in Brazil, and in recent years, Erigeron species have caused major problems to farmers in the country, mainly in relation to the ineffectiveness of herbicide treatments used. The objective of this study was to confirm the cross-resistance to ALS inhibitors in populations of Erigeron sumatrensis as well as to investigate the existence of mutations in the site of action of ALS-inhibiting herbicides. To do this, 30 populations collected in the 2016/2017 crop season were grown in a greenhouse. Dose–response (chlorimuron-ethyl and cloransulam-methyl), inhibition of cytochrome P-450 with malathion, and ALS gene sequencing experiments were carried out in the F1 generations of two fleabane populations. The results proved the cross-resistance to chlorimuron-ethyl and cloransulam-methyl herbicides applied in the post-emergence of the resistant population of E. sumatrensis. The higher activity of P450 enzymes is unlikely responsible for the resistance of the population studied. The resistance mechanism found in R was the target site mutation Pro197Ser at the ALS gene. This is the first study in Brazil to identify a target-site change as a survival mechanism in E. sumatrensis for the resistance to ALS-inhibiting herbicides.

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Section: Discussionmentioning

confidence: 99%

Section: Whole-plant Dose-response Relationshipmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Target-Site Mutation Confers Cross-Resistance to ALS-Inhibiting Herbicides in Erigeron sumatrensis from Brazil

Silva

Mendes

Suzukawa

et al. 2022

Plants

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Survival and development of Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) on Conyza bonariensis L. and Amaranthus viridis L.

Fortuna,

Godoy,

Reis

et al. 2024

J Plant Dis Prot

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Identification, mapping, and chemical control of fleabane resistant to glyphosate, chlorimuron, paraquat, and 2,4-D

Lorenzetti,

Danilussi,

Albrecht

et al. 2024

Weed Technol

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Monitoring herbicide-resistant weeds makes it possible to study the evolution and spread of resistance, providing important information for management. The objective of this study was to map fleabane accessions in the states of Paraná (PR) and Mato Grosso do Sul (MS), Brazil, to identify herbicide-resistant accessions and their response to soybean pre-plant chemical burndown management strategies. Fleabane seeds were collected in agricultural areas in PR and MS, in 2018, 2019, and 2020. Initial screening was performed for glyphosate, chlorimuron, paraquat, 2,4-D, saflufenacil, and glufosinate efficacy. Subsequently, dose-response experiments were conducted. Field experiments were carried out in three locations, where accessions of multiple-resistant Sumatran fleabane were identified. Herbicides were used in single or sequential (seq.) applications at three plant heights (<5 cm, 5 to 10 cm, and >10 cm). After preliminary screening, accessions were classified as putative resistant (<80% control for all 4 replicates), segregated (<80% control for 1 to 3 replicates), or susceptible (>80% control for all 4 replicates). There was no evidence of resistance to glufosinate or saflufenacil in any of the 461 accessions, while 65 showed possible resistance or segregation only for glyphosate, 235 for glyphosate + chlorimuron, 79 to glyphosate + chlorimuron + paraquat, 59 to glyphosate + chlorimuron + 2,4-D, and 23 with 4-way resistance (glyphosate, chlorimuron, paraquat and 2,4-D). Of these 23 accessions, 7 were analyzed using dose-response curves (F2 generation), all from PR, confirming 4-way resistance to glyphosate, chlorimuron, paraquat, and 2,4-D. To control resistant Sumatran fleabane, an application should prioritize smaller plants. Despite resistance to 2,4-D, double mixtures containing this herbicide were among the most effective treatments in plants <5 cm in height. Sequential application is needed for plants >5 cm in height, it was recommended glyphosate + synthetic auxin followed by glufosinate or glyphosate + saflufenacil.

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Monitoring Glyphosate- and Chlorimuron- resistant Conyza spp. Populations in Brazil

Cited by 10 publications

References 30 publications

A Target-Site Mutation Confers Cross-Resistance to ALS-Inhibiting Herbicides in Erigeron sumatrensis from Brazil

A Target-Site Mutation Confers Cross-Resistance to ALS-Inhibiting Herbicides in Erigeron sumatrensis from Brazil

Survival and development of Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) on Conyza bonariensis L. and Amaranthus viridis L.

Identification, mapping, and chemical control of fleabane resistant to glyphosate, chlorimuron, paraquat, and 2,4-D

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