Droplet Spectra and Surface Tension of Spray Solutions by Biological Insecticide and Adjuvants

Costa, Lílian Lúcia; Silva, Henrique J. P. Soares da; Almeida, Dieimisson Paulo; Ferreira, Marcelo da Costa; Pontes, Nadson de Carvalho

doi:10.1590/1809-4430-eng.agric.v37n2p292-301/2017

Cited by 18 publications

(11 citation statements)

References 18 publications

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“…Because coverage is related to the reduction of surface tension and contact angle, products that have this capacity can increase the coverage area and improve agricultural applications. The interference of surface tension with droplet coverage was also mentioned by Costa et al (2017), who stated that reducing surface tension may result in increased droplet coverage.…”

Section: Resultsmentioning

confidence: 85%

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Study of the Effects of Adjuvants Associated With Insecticides on the Physicochemical Properties of the Spray Solution and Characterization of Deposits on Wheat and Maize Leaves Under Simulated Rain

Melo

Hunsche²,

Guedes

et al. 2019

Eng. Agríc.

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The association of adjuvants with phytosanitary products has been tested for several years but is commonly recommended without considering technical and scientific criteria. This study aimed to evaluate the influence of the association of insecticides with different adjuvants on surface tension, contact angle, coverage, hydrogen ionic potential (pH), and the formation of deposits exposed to rain. The insecticides thiamethoxam, imidacloprid, and lambda-cyhalothrin were tested at doses of 75 g ha-1 , 150 g ha-1 , and 150 g ha-1 , respectively, with a spray volume of 200 L ha-1. Break-Thru 240 ® , Break-Thru 233 ® , Break-Thru Union ® , Oleo FC Agraröl ® , and Naturo'il ® were added to each of these spray solutions. The results showed that the addition of adjuvants reduced the surface tension and contact angle, and consequently, increased droplet coverage. No deposit pattern was found in the thiamethoxam, imidacloprid, and lambda-cyhalothrin insecticides associated with the adjuvants and a higher amount of residue was observed on wheat leaves than on maize leaves. The use of adjuvants can be an alternative to improve the efficiency of insecticides, allowing the product to achieve its full control potential.

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Section: Resultsmentioning

confidence: 85%

“…The use of adjuvants can reduce the surface tension of insecticide spray solutions (Costa et al, 2017). This effect improves droplet coverage.…”

Section: Introductionmentioning

confidence: 99%

Study of the Effects of Adjuvants Associated With Insecticides on the Physicochemical Properties of the Spray Solution and Characterization of Deposits on Wheat and Maize Leaves Under Simulated Rain

Melo

Hunsche²,

Guedes

et al. 2019

Eng. Agríc.

View full text Add to dashboard Cite

show abstract

“…This result was not expected for the JAI 120015 model because at the pressure of 45 lbf in -2 , which was used in this experiment, this model should produce thick drops according to the manufacturer's indication. This difference may be related to the composition of the spray solution (Almeida et al, 2016;Costa et al, 2017a;Costa et al, 2017b). It is worth noting that the evaluations for the classification of the droplet spectrum produced by the different nozzle models available on the market are measured with standard spray solutions in accordance with ANSI/ASAE S572.1 standard from ASABE (2009).…”

Section: Droplets Spectrummentioning

confidence: 99%

Insecticide Spraying in Soybean Plants: Different Nozzles Models and Agrometeorological Conditions

et al. 2018

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The aim of the experiment was to evaluate the quality of the spraying by the spray volume deposit provided by different nozzles models in two agrometeorological conditions of application. Four parameters related to spray quality were evaluated: spray volume deposit, droplet size, surface tension and contact angle. The treatments consisted of three nozzle models (AXI Twin 12002, TTJ 110015 and JAI 120015) and two application times (between 02:00 p.m. and 04:00 p.m. and between 08:00 a.m. and 09:30 a.m.). The spray volume deposit in the upper portion of the soybean plants was similar, but the JAI 120015 nozzle model produces more uniform droplet spectra and is safer than the AXI Twin 12002 and TTJ 110015 due to the highest drift risk. It is necessary to study alternatives that increase spray deposits in the lower portion of the crop, since in this study the distribution uniformity of the mixture in the portions of the soybean plant was low and the agrometeorological conditions interferes in the deposits of the sprayed mixture but is dependent on the selected nozzle model.

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“…Spray solution physicochemical characteristics need to be considered to evaluate application efficiency, as they can interfere with the generated droplet spectrum and deposition, as well as the absorption and penetration of droplets by leaves. Among the main properties evaluated for herbicides are droplet size, surface tension, and contact angle, as they may influence the interaction of the spray solution with the target surface (Marques et al, 2012;Costa et al, 2017;Cunha et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Influence of Glyphosate Concentrations on Spray Solution Physicochemical Characteristics and Drift Potential

et al. 2020

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The herbicide glyphosate is sprayed with varying application volumes that result in different concentrations used in the spray solutions. Thus, this study aimed to evaluate the effect of glyphosate concentrations on the potential risk of droplet drift, surface tension of spray solution, and contact angle of droplets on surfaces. Three experiments were conducted in a completely randomized design. Drift potential was evaluated by median volumetric diameter (MVD), percentage volume of droplets with diameter smaller than 100 µm (%V<100 µm), and coefficient of uniformity (Span), with 12 replications. The surface tension of spray solutions and contact angle of droplets were evaluated on Urochloa ruziziensis leaves, paraffin film, and glass, with four replications. Changing glyphosate concentrations in the spray solution changes the droplet spectrum and contact angle on different surfaces due to changes in spray solution physicochemical characteristics, such as surface tension. The increased glyphosate concentrations in the spray solution lead to increased drift potential of droplets, reducing the surface tension and contact angle of droplets on surfaces.

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Droplet Spectra and Surface Tension of Spray Solutions by Biological Insecticide and Adjuvants

Cited by 18 publications

References 18 publications

Study of the Effects of Adjuvants Associated With Insecticides on the Physicochemical Properties of the Spray Solution and Characterization of Deposits on Wheat and Maize Leaves Under Simulated Rain

Study of the Effects of Adjuvants Associated With Insecticides on the Physicochemical Properties of the Spray Solution and Characterization of Deposits on Wheat and Maize Leaves Under Simulated Rain

Insecticide Spraying in Soybean Plants: Different Nozzles Models and Agrometeorological Conditions

Influence of Glyphosate Concentrations on Spray Solution Physicochemical Characteristics and Drift Potential

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