Herbicide tank mixtures to control co-existing glyphosate-resistant Canada fleabane and giant ragweed in soybean

Mahoney, Kris J.; McNaughton, Kristen E.; Sikkema, Peter H.

doi:10.1139/cjps-2015-0344

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…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. (4,7,15,16,17,34). Other studies also demonstrated, as in the present study, the efficacy of flumioxazin in different combinations for the control of Conyza spp.…”

Section: Discussionsupporting

confidence: 88%

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: Discussionsupporting

confidence: 88%

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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“…Both 2,4-D and dicamba weed management programs have been found to be effective against Palmer amaranth, common waterhemp [ Amaranthus tuberculatus (Moq.) J. D. Sauer] (Cahoon et al 2015; Inman et al 2016; Meyer et al 2015), horseweed ( Erigeron canadensis L.) (Byker et al 2013; Flessner et al 2015; Ford et al 2014), and giant ragweed ( Ambrosia trifida L.) (Jhala et al 2014; Mahoney et al 2016), which are some of the most troublesome weedy pests in the United States (Van Wychen 2016).…”

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confidence: 99%

Effects of Low-Dose Applications of 2,4-D and Dicamba on Watermelon

et al. 2018

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The commercial release of crops with engineered resistance to 2,4-D and dicamba will alter the spatial and temporal use of these herbicides. This, in turn, has elicited concerns about off-target injury to sensitive crops. In 2014 and 2015, studies were conducted in Tifton, GA, to describe how herbicide (2,4-D and dicamba), herbicide rate (1/75 and 1/250 field use), and application timing (20, 40, and 60 DAP) influence watermelon injury, vine development, yield, and the accumulation of herbicide residues in marketable fruit. In general, greater visual injury and reductions in vine growth, relative to the non-treated check, were observed when herbicide applications were made before watermelon plants had begun to flower. Although the main effects of herbicide and rate were less influential than the timing of applications with respect to plant development, the 1/75 rates were more injurious than the 1/250 rates; dicamba was more injurious than 2,4-D. In 2014, the 1/75 and 1/250 rates of each herbicide reduced marketable fruit numbers 13 to 20%, but only for the 20 DAP application. The 1/75 rate of each herbicide when applied at either 20 or 40 DAP reduced the number of fruit harvested per plot in 2015. Dicamba residues were detected in marketable fruit when the 1/75 rate in 2014 and 2015 and the 1/250 rate in 2015 was applied to plants at 40 or 60 DAP. Residues of 2,4-D were detected in 2015 when the 1/75 and 1/250 rates were applied at 60 DAP. Across both years, the maximum level of residue detected was 0.030 ppm. While early season injury may reduce watermelon yields, herbicide residue detection is more likely in marketable fruit when an off-target contact incident occurs closer to harvest.

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“…The application of glyphosate+saflufenacil has been reported effective especially to control eudicotyledon weeds, for example, Conyza spp. (Mahoney et al, 2016). However, saflufenacil does not present high control on Digitaria spp.…”

Section: Resultsmentioning

confidence: 96%

Digitaria insularis control by using herbicide mixtures application in soybean pre-emergence

Bauer

Albrecht

et al. 2021

Rev. Fac. Nac. Agron. Medellín

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Sourgrass (Digitaria insularis) is one of the main weeds in the soybean crop. In order to control its growth, an increase of herbicide rates is required to simplify its management as it a plant with high vegetative capacity and seed production. It implies to select the herbicide-resistent Digitaria insularis biotypes. Nevertheless, some information is still contrasting the antagonist of synthetic auxinic herbicides, associated with glyphosate and ACCase inhibitors mixtures, for the control of weeds resistant or tolerant to herbicides. This study aimed to evaluate the D. insularis control, with a mixture of herbicides applied in soybean pre-emergence, with sequential application in soybean post-emergence, and to check possible antagonism between ACCase inhibitors herbicides with synthetic auxins and other latifolicides. The experiment was conducted in Palotina, Paraná (Brazil) and Corpus Christi, Canindeyú, (Paraguay.) The treatments consisted of associations of glyphosate, ACCase inhibitors (clethodim, haloxyfop), and latifolicides (2,4-D, triclopyr, dicamba, carfentrazone, saflufenacil, chlorimuron). A randomized block design was used. Only in Palotina, the weed control was satisfactory after sequential application in post-emergence. An antagonism for all synthetic auxins was observed with glyphosate+clethodim or haloxyfop mixtures, in both locations. As a result, in Palotina an efficacious control of perennial D. insularis was found in pre-emergence burndown for some mixtures such as glyphosate+ACCase inhibitor added to carfentrazone, saflufenacil, or chlorimuron. Antagonism was observed for all synthetic auxins, in both locations. In Corpus Christi, the herbicide associations were not effective, even with the postemergence application in soybean of glyphosate+clethodim. With ineffective control for treatments composed with synthetic auxins, the post-emergence application in soybean increased the weed control with satisfactory final controls for all treatments.

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Herbicide tank mixtures to control co-existing glyphosate-resistant Canada fleabane and giant ragweed in soybean

Cited by 3 publications

References 16 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

Effects of Low-Dose Applications of 2,4-D and Dicamba on Watermelon

Digitaria insularis control by using herbicide mixtures application in soybean pre-emergence

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