Herbicide alternative for Conyza sumatrensis control in pre-planting in no-till soybeans

Cantu, Renan M.; Albrecht, Leandro Paiola; Albrecht, Alfredo Júnior Paiola; Silva, André Felipe Moreira; Danilussi, Maikon Tiago Yamada; Lorenzetti, Juliano Bortoluzzi

doi:10.51694/advweedsci/2021;39:000012

Cited by 23 publications

(14 citation statements)

References 20 publications

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“…According to Hedges et al (2019), the pre-sowing application of dicamba/ glyphosate (1,800 g ae ha -1 ) + saflufenacil (25 g ai ha -1 ) or saflufenacil/imazethapyr (100 g ae ha -1 ) was effective in controlling C. canadensis, with results of ≥91% (12 weeks after application). Similarly, Cantu et al (2021) reported the effectiveness of dicamba, in combination with other herbicides, in the control of C. sumatrensis. Moreover, Hedges et al (2019) observed up to 10% soybean injury with the application of saflufenacil in different chemical management programs; however, the symptoms did not result in reduced soybean yield, thus demonstrating that the application of saflufenacil is effective in different management programs to control Conyza spp.…”

Section: Discussionmentioning

confidence: 99%

Sequential application of herbicide options for controlling Conyza sumatrensis in soybean pre-sowing

Albrecht

Silva³

et al. 2022

Rev. FCA UNCUYO

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The aim of this study was to evaluate the efficacy of sequentially applied herbicides to control Conyza sumatrensis, one of the most widely distributed weeds worldwide, in soybean pre-sowing burndown. The study was conducted under field conditions in the state of Paraná, Brazil, at 2018-2019 growing season. The experiment consisted of a randomized block design with four replicates, with 12 treatments consisting of different herbicide mixtures applied before sowing. Control of C. sumatrensis, injury to soybean plants, and variables related to agronomic performance were evaluated. The control levels were high for all treatments, except for the one that was free of saflufenacil in either of the two applications. These results highlight the importance of saflufenacil in the control of C. sumatrensis and show promise for the use of saflufenacil/imazethapyr when considering the system and other weeds. All studied treatments were selective to soybean, which showed higher injury values in the presence of diclosulam; however, this did not compromise the agronomic performance of soybean. Highlights • Application of systemic herbicides with sequential application of burndown herbicides, is essential for the control of Conyza sumatrensis (>15 cm height).• Saflufenacil, flumioxazin, and imazethapyr stand out in the control of Conyza sumatrensis.• Protox and ALS inhibitors can replace paraquat in sequential application with equal efficacy in the control of Conyza sumatrensis.

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Section: Discussionmentioning

confidence: 99%

Sequential application of herbicide options for controlling Conyza sumatrensis in soybean pre-sowing

Albrecht

Silva³

et al. 2022

Rev. FCA UNCUYO

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“…The ban on paraquat reinforces the need for the characterization and configuration of new management. Therefore, glufosinate has been highlighted (Eubank et al, 2008;Frene et al, 2018;Tahmasebi et al, 2018;Albrecht et al, 2020c;Cantu et al, 2021). Saflufenacil can also be used as an alternative for the control of Conyza spp.…”

Section: Pre-harvest Desiccationmentioning

confidence: 99%

Agronomic implications of paraquat ban in Brazil

Albrecht¹,

Albrecht²,

Silva³

2022

Advances in Weed Science

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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided that the original author and source are credited. Paraquat: mode of action and historical aspectsParaquat and diquat are bipyridylium herbicides with photosystem I electron diversion mode of action. They have contact action, limited translocation and rapid Abstract: Background: Paraquat is a broad spectrum herbicide used particularly in burndown, in pre-plant of row crops and in the pre-harvest desiccation of some crops. In Brazil, paraquat was re-evaluated by Anvisa, leading to a prohibition of production and sales on September 22, 2020, and used until July 31, 2021. Objective: The objective of this review is to characterize the use of paraquat in Brazil and describe the status in other countries, particularly the agronomic implications of its ban, possible replacements, and scenarios. Review: The use of paraquat is important for weed management in different production systems. Owing to its toxicity, its use has been reevaluated in several countries. For pre-harvest desiccation of soybeans, diquat, glufosinate, and some combinations with Protox inhibitors are highlighted as alternatives to paraquat. For pre-harvest desiccation of common beans, diquat, saflufenacil, and glufosinate could be used; however, only glufosinate could be used for wheat. For managing broadleaves weeds, glufosinate, saflufenacil, carfentrazone, and diquat are effective alternatives. Diquat may be less effective in controlling Conyza spp. resistant to paraquat. For grasses control, glufosinate, in addition to ACCase inhibitors and possible mixtures, may be helpful. Although pre-emergent herbicides are not classified as desiccant herbicides, they contribute to weed management. The adoption of herbicide-tolerant crops, mechanical control, and cover crops can be added as agricultural practices for integrated weed management. Conclusions: Due to the ban on paraquat, challenges arise, and the most often suggested replacements are glufosinate, diquat, and Protox inhibitors; however, grass control will be of greater concern.

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“…Post-emergent herbicides are valuable options for controlling herbicide-resistant Conyza spp. (Cantu et al 2021;Pedroso et al 2021). Even though post-emergent herbicide absorption can occur upon contact of molecules with leaves, stems, flowers, and even fruits, the former represents the primary route for herbicide uptake in weeds (Silva 2000).…”

Section: Introductionmentioning

confidence: 99%

Glyphosate-resistant hairy fleabane (Conyza bonariensis) exhibits a larger number of trichomes and altered stomatal density relative to the susceptible counterpart

et al. 2023

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Following the adoption of Roundup Ready crops, glyphosate spraying frequency increased, while the use of other herbicide modes of action was neglected. Herbicide-resistant biotypes were reported in three major Conyza species in Brazil, including Conyza bonariensis, increasing growers’ bottom line. Considering that leaf surface structures affect proper herbicide deposition, uptake, and performance, this study aimed to characterize epicuticular surface components in glyphosate-resistant (R) and -susceptible (S) C. bonariensis. Conyza spp. seeds were collected in 36 locations in Brazil, and plants were subjected to resistance screening tests by spraying glyphosate at 720 and 1440 g ae ha-1 (0.5X and 1X the label recommended rate, respectively). For resistance level characterization, C. bonariensis biotypes with contrasting responses were selected for glyphosate dose-response assays. Leaf tissues for epicuticular surface analysis were harvested from newly-obtained R and S biotypes at two growth stages. Histological cuts were made on a leaf area of 25 mm² with a blade. Samples were fixed in Karnowsky solution, gradually changed to 100% ethanol, critical-point dried with CO2, and coated with gold, followed by stomatal and trichome density quantification using scanning electron microscopy. Results indicated a poor control with glyphosate in 33 of 36 Conyza spp. biotypes, and a high (31.5) resistance factor was calculated after dose-response trials. Leaf surface analysis indicated that C. bonariensis leaves are amphistomatic and exhibit tectorial trichomes. A higher number of trichomes and altered stomatal density (number.mm²) were quantified in R compared to the S counterpart, potentially reducing glyphosate uptake and effectiveness.

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Herbicide alternative for Conyza sumatrensis control in pre-planting in no-till soybeans

Cited by 23 publications

References 20 publications

Sequential application of herbicide options for controlling Conyza sumatrensis in soybean pre-sowing

Sequential application of herbicide options for controlling Conyza sumatrensis in soybean pre-sowing

Agronomic implications of paraquat ban in Brazil

Glyphosate-resistant hairy fleabane (Conyza bonariensis) exhibits a larger number of trichomes and altered stomatal density relative to the susceptible counterpart

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