Application Volumes and Sizes of Droplets for the Application of Diquat Herbicide in the Control of Eichhornia crassipes

Almeida, Dieimisson Paulo; Agostini, Angela; Yamauchi, Alfredo Kohiti Feres; Decaro, Sérgio Tadeu; Ferreira, M. C.

doi:10.1590/s0100-83582016340100018

Cited by 7 publications

(6 citation statements)

References 15 publications

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“…Obtaining a jet of spray mixture with droplets of uniform size spectrum means lower losses (Ferreira et al 2013). It is worth mentioning that the use of the class of fine droplets is recommended when greater coverage and penetration is required in the canopy of plants, as well as those produced in this research, and that classes of medium or coarse droplet sizes are better for application under conditions of greater risk of drift (Cunha et al 2007;De Oliveira and Antuniassi 2011;Almeida et al 2014Almeida et al , 2016Triloff et al 2014). However, little is known about the drop diameter ratio that provides coverage of a leaf 's surface that results in effective pest control.…”

Section: Characterization Of Spray Droplet Sizementioning

confidence: 94%

Journal of Plant Protection Research

Vechia¹,

Santos²,

Griesang³

et al. 2019

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In agriculture, the mixing of pesticides in tanks is a common practice. However, it is necessary to previse possible physical-chemical implications of this practice, which may affect the efficiency of the treatments performed. Therefore, the objective of this study was to evaluate the effects of the addition of acaricide to insecticidal spray mixtures on the formation of spray droplets and the interaction with citrus leaves. The experimental design was totally randomized, in a (2 × 3 + 1) factorial scheme for seven treatments. Factor A corresponded to the spray mixture used (isolate or in the mixture). Factor B corresponded to the insecticides tested (lambda-cyhalothrin + thiamethoxam, phosmet, and imidacloprid) and the control consisted of a spray mixture with spirodiclofen only. Nine replications were performed for characterization of the spray droplet size spectrum and four replications for the analysis of the surface tension and the contact angle. The mixture of pesticides showed positive results in terms of application safety. The addition of acaricide to insecticide spray mixtures reduced the surface tension and contact angle of droplets on the adaxial surface of orange leaves. There was an increment in volume median diameter (VMD), a significant reduction in the volume of droplets with drift-sensitive size and improvement in the uniformity of droplet size. Therefore, the addition of acaricide to an insecticide spray mixture positively influenced spray droplet formation and the interaction with citrus leaves providing better coverage and droplet size fractions with an appropriate size for safe and efficient application.

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Section: Characterization Of Spray Droplet Sizementioning

confidence: 94%

Journal of Plant Protection Research

Vechia¹,

Santos²,

Griesang³

et al. 2019

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“…Unif. = Coefficient of Uniformity (dimensionless), Dv0.1; Dv0.5 and Dv0.9 refer to the droplet diameter (μm), such that 10, 50 and 90%, respectively, of the sprinkled volume is composed of diameter droplets smaller than it (ALMEIDA et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2017

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Biological insecticides can be another pest control method used in integrated pest management; hence there is a demand for scientific information about these products to understand the appropriate application technique. The aim of this study was to evaluate the spray spectra data by different nozzle types using biological insecticide isolated and with adjuvants, as well the surface tension of these spray solutions. For droplet spectra data, a particle size analyzer was used and for surface tension of the spray solution, the method of pendant drop was used. Among the nozzles tested, ADI 11002 provided greater droplets median diameter volume, a lower percentage of droplets with diameters less than 100 μm and also the highest coefficient of uniformity. In general, the addition of adjuvants reduced the median droplet diameter and increased the proportion of drops susceptible to spray drift. By adding adjuvants to the spray solution there was a lower surface tension, which were dependent of the adjuvant chemical group. The Silwet L-77® adjuvant showed the lowest surface tension among the spray solutions evaluated.

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“…Herbicide concentration in the spray solution acts with different intensities on MVD for different spray tip models. Almeida et al (2016) observed that the increased concentration of the herbicide diquat from 2 to 4 g a.i. L −1 of spray solution resulted in a reduction in the size of droplets generated by air-induction tips from 599 to 590 µm, respectively, while tips that generate droplets without air induction increased MVD from 166 to 190 µm.…”

Section: Variablementioning

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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Application Volumes and Sizes of Droplets for the Application of Diquat Herbicide in the Control of Eichhornia crassipes

Cited by 7 publications

References 15 publications

Journal of Plant Protection Research

Journal of Plant Protection Research

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

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

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