Droplet evaporation and spread on waxy and hairy leaves associated with type and concentration of adjuvants

Li, Xu; Zhu, Heping; Ozkan, H. E.; Bagley, W. E.; Krause, C. R.

doi:10.1002/ps.2122

Cited by 119 publications

(114 citation statements)

References 25 publications

(37 reference statements)

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“…After the evaporation of the droplets fixed on the foliar surface, there might be no more absorption of the product applied (Ramsey et al 2005). After evaporation, crystals containing the active ingredient can be formed, preventing its absorption (Yu et al 2009b, Xu et al 2011. By increasing the evaporation time, the pesticide efficacy can be improved (Ramsey et al 2006).…”

Section: Resultsmentioning

confidence: 99%

Evaporation time of droplets containing thiamethoxam and adjuvants sprayed on sugarcane leaves

Cunha

Lasmar

Ramos

et al. 2016

Pesqui. Agropecu. Trop.

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The spread and evaporation time of droplets deposited on the target affect the application efficiency of pesticides. This study aimed at evaluating the evaporation time of droplets with different sizes, under different levels of relative air humidity, containing thiamethoxam and adjuvants sprayed on sugarcane leaves. Data were collected in a climate chamber with controlled conditions, where a digital microscope was set up to record the droplet images. The evaporation time was evaluated considering three relative air humidity rates (45 %, 60 % and 75 %). For each condition, a completely randomized experiment was installed with five replications, in a 5 x 6 factorial design consisting of five sprays (water, thiamethoxam, thiamethoxam + mineral oil, thiamethoxam + vegetable oil and thiamethoxam + spreader) and six droplet diameters (337 µm, 424 µm, 486 µm, 576 µm, 831 µm and 985 µm). The evaporation time is directly and linearly related to the droplet diameter, with larger diameters requiring a longer time to evaporate. The evaporation time of droplets is also influenced by relative air humidity and spray composition. Among the adjuvants tested, the mineral oil provides the lower evaporation time for all droplet sizes.

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Section: Resultsmentioning

confidence: 99%

Evaporation time of droplets containing thiamethoxam and adjuvants sprayed on sugarcane leaves

Cunha

Lasmar

Ramos

et al. 2016

Pesqui. Agropecu. Trop.

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“…Yu et al (2009a) relatam que o tamanho de gotas, umidade relativa do ar, estrutura da folha e a formulação do agrotóxico são os fatores que mais influenciam a evaporação de gotas na superfície das folhas. O período entre o depósito e a total evaporação da gota no alvotempo de evaporação -influência a absorção e consequentemente a translocação e ação do ingrediente ativo na planta (XU et al, 2011).…”

Section: Introductionunclassified

Evaporação De Gotas De Caldas Contendo Fungicida E Adjuvantes Depositadas Em Superfície

Vilela

Antuniassi

2013

EnergAgric

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RESUMO:Este trabalho teve como objetivo avaliar a evaporação de gotas depositadas em superfície, em diferentes condições de umidade relativa, além de características referentes à deposição da gota e a tensão superficial das caldas. Os tratamentos foram compostos por um fungicida isolado e misturado com óleo mineral (Nimbus), óleo vegetal (Óleo Vegetal Nortox) e um organosilicone (Silwet L-77 AG). As avaliações foram realizadas com auxilio de um sistema de captura de imagens, em uma sala fechada, para facilitar o controle das condições de temperatura, mantida entre 23 e 24°C. Foram realizadas 12 observações entre as UR de 40 a 80% e três repetições para UR de 45 ± 1%, comparadas por Intervalo de Confiança para Diferenças entre as Médias, a 5% de probabilidade (IC95%) e as correlações entre as variáveis pelo Coeficiente de Pearson, a 5% de probabilidade. A evaporação de gotas foi afetada pela umidade relativa do ar e pelo uso de adjuvantes, sendo o óleo mineral o adjuvante que proporcionou a calda menos sensível às variações de umidade. A área média molhada correlacionou-se de forma negativa com o tempo de evaporação de gotas e com a tensão superficial. O organosilicone foi o adjuvante que promoveu maior mudança na evaporação e deposição das gotas em superfície, em relação às caldas avaliadas. KEYWORDS: tecnologia de aplicação, deriva, diâmetro mediano volumétrico (DMV). DROPLET EVAPORATION OF SPRAY SOLUTIONS WITH FUNGICIDES AND ADJUVANTS ON A SURFACEABSTRACT: This research evaluated the droplet evaporation on a surface under different relative humidity conditions, and analyzed the characteristics related to droplet deposition and the surface tension of spray solutions. The treatments were composed by a fungicide isolated and mixed with adjuvants. The droplet evaporation evaluation was done with a system to capture images in a ambient controlled room to facility control of temperature, which was kept between 23 and 24°C. There were performed 12 observations between 40 and 80% of relative humidity. Three repetitions at 45% relative humidity were compared using Confidence Interval at 95% probability and the correlations between variable were analyzed using Pearson at 5% probability. The droplet evaporation was affected by relative humidity and by adjuvants use, and the mineral oil was the adjuvant less sensible to humidity variations. The wetted medium area was negatively correlated to evaporation. The deposition characteristics were not affected by changes in relative humidity, only by adjuvants. The organsilicone was the adjuvant that promoted the biggest change in evaporation and deposition of the dropletson a surface, compared to the other treatments.

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“…However, Xu et al (2010) reports that in addition to the wetted area, other factors that interfere with evaporation should also be considered such as surface characteristics, the presence of wax and wax composition. These factors shed light on the differences in evaporation observed for the three surfaces evaluated in the present study.…”

Section: Resultsmentioning

confidence: 99%

“…Similarly, according to Yu et al (2009b) and Xu et al (2011), active ingredients may crystalize after evaporation, which impedes absorption but which might be ameliorated by longer evaporation times. This lengthening would increase the efficiency of the application (RAMSEY et al, 2006); however, as evaporation times increase, the potential for runoff also increases, which would lower the efficiency of the application (YU et al, 2009a), especially when application rate is considered.…”

Section: Introductionmentioning

confidence: 99%

Evaporation time of droplets containing thiamethoxam and adjuvants on hydrophilic, hydrophobic and lipophilic surfaces under different air relative humidities

Lasmar¹,

Cunha²

2016

Biosci. J.

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ABSTRACT:The efficacy of pesticide applications is related to the spread and evaporation time of the droplets deposited on the target. This study evaluates the evaporation of spray droplets containing thiamethoxam and adjuvants on different surfaces and at different levels of relative air humidity. A climate controlled chamber was set up with a digital microscope to produce images of droplet evaporation. Three surfaces (hydrophilic, lipophilic and hydrophobic), five solutions (water, thiamethoxam, thiamethoxam + mineral oil, thiamethoxam + vegetable oil, thiamethoxam + surfactant) and three air humidity levels (45%, 60% and 75%) were evaluated. The surface tension of these solutions was also measured. It was found that all of the insecticide solutions reduced surface tension, that air humidity, target surface and spray formulation influenced spray evaporation and that surfactants reduced the evaporation time of droplets on natural lipophilic surfaces.

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Droplet evaporation and spread on waxy and hairy leaves associated with type and concentration of adjuvants

Abstract: These results demonstrated that the proper concentration of MSO, NIS or OSB in spray mixtures improved the homogeneity of spray coverage on both waxy and hairy leaf surfaces and could reduce pesticide use. This article is a US Government work and is in the public domain in the USA.

Cited by 119 publications

References 25 publications

Evaporation time of droplets containing thiamethoxam and adjuvants sprayed on sugarcane leaves

Evaporation time of droplets containing thiamethoxam and adjuvants sprayed on sugarcane leaves

Evaporação De Gotas De Caldas Contendo Fungicida E Adjuvantes Depositadas Em Superfície

Evaporation time of droplets containing thiamethoxam and adjuvants on hydrophilic, hydrophobic and lipophilic surfaces under different air relative humidities

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