Interactions of agrochemicals applied to peanut; part 1: Effects on herbicides

Chahal, Gurinderbir S.; Jordan, David L.; Shew, B. B.; Brandenburg, Rick; York, Alan C.; Burton, J. D.; Danehower, David A.

doi:10.1016/j.cropro.2012.05.014

Cited by 8 publications

(8 citation statements)

References 41 publications

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“…These fertilizers are often coapplied with glyphosate in glyphosate-resistant soybean. Coapplying these products in a tank mixture is often preferred by growers due to convenience, time savings, and reduced application and labor costs (Chahal et al 2012c). No research has been reported to determine if manganese or zinc fertilizers applied with dicamba or 2,4-D would reduce herbicide activity.…”

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confidence: 99%

The Effect of Cations and Ammonium Sulfate on the Efficacy of Dicamba and 2,4-D

2013

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Dicamba or 2,4-D will be used POST for the control of weeds in soybean when dicamba- or 2,4-D-resistant soybean are commercialized. The active ingredients of both herbicides are weak acids in solution and may bind to cations present from hard water used as herbicide carrier or from foliar fertilizers added to spray solutions. The objectives of this research were (1) to determine if the efficacy of dicamba or 2,4-D are influenced by divalent cations, namely calcium (Ca), magnesium (Mg), manganese (Mn), and zinc (Zn), in the spray solution, and (2) to determine if adding ammonium sulfate (AMS) to the spray solution can overcome antagonism. The factorial study included five cation solutions (deionized water [dH2O], Ca at 590 mg L−1, Mg at 630 mg L−1, Mn at 4.97 L ha−1, and Zn at 2.33 L ha−1), two herbicide treatments (dicamba or 2,4-D), and two water conditioner treatments (without or with AMS at 20.37 g L−1). Treatments were applied to common lambsquarters, horseweed, and redroot pigweed. Control of horseweed and redroot pigweed increased when AMS was added to the 2,4-D treatments, irrespective of cation solution. Control of common lambsquarters was increased when AMS was added to 2,4-D for only the Ca and Mn cation solution. In contrast to the results obtained with 2,4-D, control of horseweed with dicamba was not influenced by cation solution. Tank-mixing AMS with dicamba increased control of both redroot pigweed and common lambsquarters in the dH2O, Mg, and Mn solutions.

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The Effect of Cations and Ammonium Sulfate on the Efficacy of Dicamba and 2,4-D

2013

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“…The compatibility of certain herbicidefungicide (Bradley and Sweets 2008;Grichar and Prostko 2009), herbicide-insecticide (Campbell and Penner 1982;Waldrop and Banks 1983), and herbicide-micronutrient (Bailey et al 2002;Scroggs et al 2009) combinations has been evaluated in soybean. Although interactions mentioned in the literature have been defined for three-way, four-way and five-way mixtures (herbicide, fungicide, insecticide, micronutrient, and adjuvant) on other cropping systems such as peanut (Chahal et al 2012b;Jordan et al 2006), such reports in soybean systems are limited. The hypothesis of this research was that combinations of glyphosate or glufosinate with growth regulator herbicides and other agrochemicals can effectively control herbicide-resistant weeds without increasing soybean injury.…”

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confidence: 99%

Influence of Glyphosate or Glufosinate Combinations with Growth Regulator Herbicides and Other Agrochemicals in Controlling Glyphosate-Resistant Weeds

Chahal

Johnson

2012

Weed technol.

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With the forthcoming release of the 2,4-D- and dicamba-resistance traits stacked with either glyphosate or glufosinate resistance, the use of 2,4-D or dicamba alone or in tank mix with glyphosate or glufosinate likely will increase the control of glyphosate-resistant weeds in soybean. There also is an increasing trend among soybean growers to apply POST herbicides in combination with fungicides, insecticides, and fertilizers to reduce trips over the field. Greenhouse experiments were conducted during 2011 and 2012 to evaluate glyphosate or glufosinate applications with growth regulator herbicides and other agrochemicals for the control of glyphosate-resistant horseweed and glyphosate-resistant common lambsquarters. In most cases, glyphosate or glufosinate application with 2,4-D or dicamba provided 80% or more control of glyphosate-resistant horseweed and glyphosate-resistant common lambsquarters. These studies demonstrate that performance of glufosinate alone and with agrochemicals was poor on glyphosate-resistant common lambsquarters. However, no differences in glyphosate-resistant common lambsquarters biomass were noted among treatments including glufosinate alone, glufosinate plus growth regulator herbicides, and glufosinate plus growth regulator herbicides plus agrochemicals. The agrochemicals lambda-cyhalothrin, manganese, and pyraclostrobin did not affect weed control by glyphosate or glufosinate combinations with growth regulator herbicides. Visible soybean injury was noted at 1 wk after treatment (WAT) only when glufosinate was applied with lambda-cyhalothrin or pyraclostrobin but no differences in visible injury were seen with these combinations at 3 WAT.

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“…The mixture formed is then applied onto the crop by spray techniques. Most studies on the interaction between adjuvant and pesticide have concentrated on the overall effects on the plants . A reduction in effectiveness due to the adjuvant–pesticide interaction is often used as a measure of interaction, and mechanisms such as metal ion antagonism or pH are proposed as the cause.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies on the interaction between adjuvant and pesticide have concentrated on the overall effects on the plants. 26 A reduction in effectiveness due to the adjuvant−pesticide interaction is often used as a measure of interaction, and mechanisms such as metal ion antagonism 27 or pH 28 are proposed as the cause. The envisaged modes of interaction between the pesticide product, as either a suspension or an emulsion, and the adjuvant are depicted schematically in Figure 1.…”

Section: ■ Introductionmentioning

confidence: 99%

Kinetic Resolution of the Interactions between Agrochemical Products and Adjuvant Systems upon Mixing

Webster

Bisset

Cahill

et al. 2016

J. Agric. Food Chem.

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The addition of an adjuvant to a pesticide usually occurs in a mix-tank, before spray application to the crop. Their interaction is potentially crucial to overall efficacy but has received little attention from a physical−chemical perspective. Study was undertaken by laser diffraction, Raman spectroscopy, and small-angle X-ray scattering to resolve these physical processes. It was shown that migration of the pesticide into the adjuvant droplet occurred in all cases studied. The level of transfer was dependent upon adjuvant level, adjuvant solubility, and surfactant level. For suspension pesticides, dissolution of crystallites within the droplet occurred to a degree limited by solubility. The results directly demonstrate the transfer of the pesticide into the adjuvant carrier. This indicates that for emulsion-based pesticides, application to the target is likely as a homogeneously mixed droplet, whereas for suspension pesticides, solubility may limit transfer and dissolution, leading to heterogeneity in the applied particles.

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Interactions of agrochemicals applied to peanut; part 1: Effects on herbicides

Cited by 8 publications

References 41 publications

The Effect of Cations and Ammonium Sulfate on the Efficacy of Dicamba and 2,4-D

The Effect of Cations and Ammonium Sulfate on the Efficacy of Dicamba and 2,4-D

Influence of Glyphosate or Glufosinate Combinations with Growth Regulator Herbicides and Other Agrochemicals in Controlling Glyphosate-Resistant Weeds

Kinetic Resolution of the Interactions between Agrochemical Products and Adjuvant Systems upon Mixing

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