Spectrum of Weed Control With 2,4-D and Dicamba Herbicides Associated to Glyphosate or Not

Osipe, Jethro Barros; Oliveira, Rubem Silvério de; Constantin, Jamil; Takano, Hudson Kagueyama; Biffe, Denis Fernando

doi:10.1590/s0100-83582017350100053

Cited by 25 publications

(18 citation statements)

References 28 publications

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“…In soybean crop, the average management costs with glyphosate‐resistant sourgrass are 150% higher and situations worsen with co‐existing sourgrass and fleabane populations (Adegas et al., 2017). Glyphosate‐resistant sourgrass is primarily controlled with acetyl‐CoA carboxylase (ACCase)‐inhibiting herbicide (Correia, Acra, & Balieiro, 2015; Gilo, Mendonça, Santo, & Teodoro, 2016), whereas fleabane is controlled by 2,4‐Dichlorophenoxyacetic acid‐N‐methylmethanamine (2,4‐D) (Kumar, Jha, & Jhala, 2017; Osipe, Oliveira, Constantin, Takano, & Biffe, 2017; Santos et al., 2015). However, a little is known about the efficacy of sequential or tank‐mix application of these herbicides to control coexisting fleabane and sourgrass populations.…”

Section: Introductionmentioning

confidence: 99%

2,4‐Dichlorophenoxyacetic‐N‐methylmethanamine and haloxyfop‐P‐methyl interaction: Sequential and interval applications to effectively control sourgrass and fleabane

et al. 2020

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Sourgrass (Digitaria insularis L.) and fleabane (Conyza spp. L.) constitute a major challenge to weed management in soybean [Glycine max (L.) Merr.] production systems in Brazil, especially when both are resistant to glyphosate and present concurrently. The aim of this study was to evaluate the interaction of haloxyfop-P-methyl [methyl(R)-2{4-{3-chloro-5(trifluoromethyl)-2-pyridyloxy] phenoxy} propanoate] and 2,4-D [2,4-Dichlorophenoxyacetic acid-N-methylmethanamine] to control sourgrass at three to four tillers and flowering stages and 12-to 15-cm fleabane at vegetative stage. The experiments were arranged in a randomized complete block design with four replicates and were conducted twice. Treatments were composed of haloxyfop-P-methyl and 2,4-D applied sequentially at 3-, 6-, and 12-d intervals.Treatments also included an untreated check, haloxyfop-P-methyl, and 2,4-D sequentially (without interval) and stand-alone applications of both herbicides. All treatments across experiments completely controlled fleabane plants, except haloxyfop-P-methyl alone. Haloxyfop-P-methyl applied ≥6 d before 2,4-D controlled flowering and three-to four-tiller sourgrass plants at rates of 50 and 100%, respectively. Based on results of this study, haloxyfop-P-methyl should be applied ≥6 d before 2,4-D in a sequential application structure to control fleabane and sourgrass (three or four tillers) when present concurrently.

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Section: Introductionmentioning

confidence: 99%

2,4‐Dichlorophenoxyacetic‐N‐methylmethanamine and haloxyfop‐P‐methyl interaction: Sequential and interval applications to effectively control sourgrass and fleabane

et al. 2020

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“…Herbicide treatments containing 2,4-D mixed with glyphosate provided superior control when compared to treatment without 2,4-D. This may be related to the fact that glyphosate in combination with 2,4-D has a synergistic effect, which has already been observed in the control of several weeds (Takano et al, 2013;Osipe et al, 2017). Ferreira et al (2018) found that two sequential applications of 2,4-D, each with 1,000 g e.a.…”

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confidence: 89%

Association of Mechanical and Chemical Methods for Cotton Stalk Destruction

et al. 2019

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The destruction of cotton stalks after harvesting is a prophylactic measure aimed at reducing the population of insects and disease inoculants that may remain in the crop residues and remaining cotton plants. The objective of this work was to evaluate integrated methods of management of the cotton stalks, combining mechanical and chemical control, to promote the eradication of cotton stalks. A 7x5 factorial experiment was installed where seven different methods of mechanical control of cotton stalk and five herbicide treatments were tested. The percentage of control (visual scale of 0 to 100%) and the number of plants regrowth per meter were evaluated at 14, 28 and 50 days after herbicide application treatment. At the end of the experiment, the size of the regrowth was evaluated at 50 days. The methods of management with mowing associated with an application on the stalk followed by another application to plant regrowth’s and mowing with two sequential applications in the sprouts, for the herbicidal treatments 2,4-D + glyphosate in association with [imazapic + imazapyr]) or saflufenacil, promoted the highest control rates of cotton stalks. Aiming at the effectiveness and speed of control, the management with the application of the treatment with 2,4-D + glyphosate + saflufenacil on the stalk, after mowing, associated to another application in the regrowth, provided 100% control at 14 days after the last application and totally inhibited the regrowth of the stalks, and was considered the most effective in the destruction of cotton stalks.

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“…The efficient use of auxin herbicides for Ipomoea spp. control is knowingly dependent on applications taking place at the recommended growth stage (OSIPE et al, 2017). 2,4-D spraying onto adult developed I. triloba plants have been shown to lead to poor control levels, whereas the use of adjuvants could help increase control efficacy in those situations (CAMPOS et al, 2009).…”

Section: Coverage and Droplet Density Number And Sizementioning

confidence: 99%

Adjuvant interference on spray solution properties of 2,4-D and dicamba herbicides and their efficacy for Ipomoea SPP. control

Dourado¹,

Melo²,

Ulguim³

et al. 2020

Biosci. J.

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Synthetic auxin herbicides constitute major alternatives for managing tough-to-kill weeds such as Ipomoea spp. Adjuvant use is known to positively affect the biological efficacy of pesticides by modifying key spraying solution and droplet properties. Determining to what extent the use of adjuvants could change spray solution parameters and affect synthetic auxin herbicides’ efficiency for Ipomoea spp. control were the research goals. The study was conducted in two phases: laboratory and field, respectively. In the laboratory, the pH, the surface tension, and the resources of the herbicide drops were measured. In the field, weed control was evaluated. All adjuvants modified spray solution properties, lowering surface tension values. Most adjuvants decreased pH values as well as number and density of droplets due to an increase in droplet size. Regardless of adjuvant usage, Ipomoea spp. control levels rose more rapidly following 2,4-D spraying rather than dicamba, resulting in lower biomass accumulation when the former was used. Dicamba-containing treatments displayed slightly but significantly lower Ipomoea spp. control levels at the end of the evaluation period. Herbicide efficacy for Ipomoea spp. control was not improved upon the addition to the spray solution of any of the tested adjuvants. Adjuvant use altered spraying solution and droplet properties. 2,4-D spraying allowed for lower Ipomoea spp. biomass and greater control levels relative to dicamba, suggesting it might constitute a better option for Ipomoea spp. control. Even though herbicide efficacy was not improved with adjuvants, their use should still be considered given favorable spraying solution alterations, mainly with some alteration in droplet sizes despite the use of similar spray nozzles tips - maintaining weed control efficacy.

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Spectrum of Weed Control With 2,4-D and Dicamba Herbicides Associated to Glyphosate or Not

Cited by 25 publications

References 28 publications

2,4‐Dichlorophenoxyacetic‐N‐methylmethanamine and haloxyfop‐P‐methyl interaction: Sequential and interval applications to effectively control sourgrass and fleabane

2,4‐Dichlorophenoxyacetic‐N‐methylmethanamine and haloxyfop‐P‐methyl interaction: Sequential and interval applications to effectively control sourgrass and fleabane

Association of Mechanical and Chemical Methods for Cotton Stalk Destruction

Adjuvant interference on spray solution properties of 2,4-D and dicamba herbicides and their efficacy for Ipomoea SPP. control

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