Spray drift and droplet spectrum from dicamba sprayed alone or mixed with adjuvants using air-induction nozzles

Alves, Guilherme Sousa; Kruger, Greg R.; Cunha, João Paulo Arantes Rodrigues da

doi:10.1590/s0100-204x2018000600005

Cited by 15 publications

(18 citation statements)

References 15 publications

(18 reference statements)

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“…Adjuvants can be classified as evaporation reduction substances, penetrating agents, adhesives, spreaders, anti-foaming agents, drift reducers, and conditioners 13 , besides other function categories. It has been observed, for example, that combinations of dicamba with different adjuvants have the potential to reduce pH and increase droplet size and uniformity in addition to other physicochemical effects 9 , 14 .…”

Section: Introductionmentioning

confidence: 99%

Physicochemical properties, droplet size and volatility of dicamba with herbicides and adjuvants on tank-mixture

Ferreira

Thiesen

Pelegrini

et al. 2020

Sci Rep

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The adoption of dicamba-tolerant soybean varieties has increased the concern and demand for new drift and volatility reduction technologies. Potential spray nozzles and adjuvants should be studied to determine its effects on drift and volatility of dicamba tank-mixtures. The objective of this study was to evaluate physicochemical characteristics of spray solutions containing dicamba; to analyze droplet size effect with air induction nozzles; and to assess dicamba volatilization on soybean plants with a proposed methodology. Treatments included dicamba only and mixtures with herbicides and adjuvants. Dicamba mixed with lecithin + methyl soybean oil + ethoxylated alcohol adjuvant had the greatest efficacy potential among treatments considering tank-mixture pH, surface tension, contact angle and droplet size. The MUG11003 nozzle produced the coarsest droplet size and was better suited for drift management among nozzle types. The proposed volatilization methodology successfully indicated dicamba volatilization in exposed soybean plants and among the evaluated treatments, it showed greater volatilization for dicamba with glyphosate + lecithin + propionic acid adjuvant.

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Section: Introductionmentioning

confidence: 99%

Physicochemical properties, droplet size and volatility of dicamba with herbicides and adjuvants on tank-mixture

Ferreira

Thiesen

Pelegrini

et al. 2020

Sci Rep

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show abstract

“…Another adjuvant that has a broad spectrum of use is phosphatidylcholine (lecithin) with propionic acid. Studies show that this adjuvant has as main characteristic the drift reduction due to an increase in the size of droplets generated during the applications (ALVES et al, 2018;ROSS Jr. et al, 2018). However, adverse effects from the use of this compound were observed by Sanches et al (2018), such as a reduction in the effectiveness of the acaricide when used with this adjuvant.…”

Section: Introductionmentioning

confidence: 99%

Adjuvants plus phytosanitary products and the effects on the physical-chemical properties of the spray liquids

Assunção¹,

Campos

Sousa

et al. 2019

Biosci. J.

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The frequent tank mixing of phytosanitary products, adjuvants, and foliar fertilizers highlights the lack of information which sustains decisions about what products can be mixed for spray application. Thus, the aim of this study was to evaluate the physical and chemical characteristics of fungicides, herbicides, and insecticides in combination with some adjuvants on the Brazilian market. The experimental design was completely randomized and spray mixes of the phytosanitary products: fungicide (azoxystrobin+benzovindiflupir), herbicide (diamônio salt of N-(phosponomethyl)) or insecticide (fenpropathrin) were evaluated in combination with adjuvants (mineral oil base, foliar fertilizer or lecithin + propionic acid), and in two application rates (95 and 52 L ha-1); all with four replications. Surface tension, electrical conductivity, pH, dynamic viscosity and density of spray mixes were evaluated. The adjuvants presented characteristics capable of significantly altering the physicochemical properties of the phytosanitary spray mixes, and thus, alter the biological effectiveness and efficiency of the spray applications. However, its effects are also dependent on the phytosanitary product added to the spray mix, which makes general recommendations a difficult task. The greatest pH reduction, as well as the greatest increase in electrical conductivity, were caused by the adjuvant lecithin + propionic acid. All phytosanitary products and adjuvants studied, associated or not, resulted in a reduction in the surface tension of the spray mix in relation to water. The magnitude of change of density and dynamic viscosity promoted by adjuvants was lower than the other characteristics evaluated.

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“…The concerning about losses due to spray drift of 2,4-D has increased due to the release of cultivars tolerant to this herbicide and the consequent increase of its use. Therefore, researches are needed to develop adequate technologies to reduce the harmful effect of spray drift of 2,4-D, such as anti-drift hydraulic nozzles with air induction (Alves et al, 2018), use of adjuvants (Oliveira et al, 2015), and new formulations of 2,4-D as the choline salt of the Enlist TM technology (Enlist, 2019).…”

Section: (B)mentioning

confidence: 99%

Effects of 2,4-D Herbicide on Species of the Digitaria Genus

et al. 2019

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The objective of this work was to evaluate the effects of the 2,4-D herbicide on the growth and development of Digitaria insularis and Digitaria horizontalis plants under different climatic conditions. Two greenhouse experiments were conducted in a completely randomized design, with 11 treatments (rates of the herbicide) and four replications. Rate-response curves were determined for the 2,4-D rates of 0, 50.37, 100.75, 201.5, 403, 806, 1,612, 3,224, 6,448, 12,896, and 25,792 g a.i. ha-1. The plants presented growth stimulus with low rates of 2,4-D in the autumn-winter period, but this stimulus was not found in the spring-summer period. The plants subjected to application of high rates of 2,4-D had significantly lower growth and development than the control, regardless of the climatic conditions. Therefore, auxin herbicides must be used with caution, mainly in periods of low temperatures, because any problems related to the application technology - which may cause the contact of plants with low rates of this herbicide - will promote the growth of plants of these species, hindering the control and favoring the dispersion of these plants.

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Spray drift and droplet spectrum from dicamba sprayed alone or mixed with adjuvants using air-induction nozzles

Cited by 15 publications

References 15 publications

Physicochemical properties, droplet size and volatility of dicamba with herbicides and adjuvants on tank-mixture

Physicochemical properties, droplet size and volatility of dicamba with herbicides and adjuvants on tank-mixture

Adjuvants plus phytosanitary products and the effects on the physical-chemical properties of the spray liquids

Effects of 2,4-D Herbicide on Species of the Digitaria Genus

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