Systems of aerial spraying for soybean rust control

Antuniassi, Ulisses Rocha; Velini, Edivaldo Domingues; Oliveira, Rone Batista de; Oliveira, M. A. P.; Figueiredo, Zulema Netto

doi:10.1590/s0100-69162011000400008

Cited by 8 publications

(15 citation statements)

References 7 publications

(3 reference statements)

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“…Therefore, the expected functions for the adjuvants were to improve the spreading of the droplets, reduce spray drift and increase the pesticide retention on the leaves during the spray applications. These functions are compatible with the adjuvants classes used by those participants (OLIVEIRA et al, 2013;MOTA et al, 2013;ANTUNIASSI et al, 2011). In addition, 20.4% of the participants answered the question about the method used for the internal cleaning of spray tanks.…”

Section: Resultsmentioning

confidence: 73%

“…This result may indicate improvement in the applications quality if the adjuvants selection were based on technical criteria. The correct use of adjuvants can enhance the applications quality, reduce spray drift and improve the pesticides effectiveness (ANTUNIASSI et al, 2011;CHECHETTO & ANTUNIASSI, 2012). In addition, 37.3% of participants answered about the adjuvants used in pesticides applications.…”

Section: Resultsmentioning

confidence: 99%

“…Selecting an adjuvant is not simple, since it can exhibit distinct functions. Furthermore, the application effectiveness is dependent on the interactions between the pesticides, adjuvants and the crop to be treated (ANTUNIASSI et al, 2011;MOTA et al, 2013;OLIVEIRA et al, 2013). In conclusion, not knowing the function played by an adjuvant can increase the cost of the phytosanitary trea tments or the risk of environmental contamination by spray drift (CHECHETTO & ANTUNIASSI, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…Among these participants, 24.9% reported good results with the used adjuvants while 1.0% did not obtain good results (Figure 4). It is not simple to measure the positive effects resulting from the use of adjuvants, like those used for reducing drift or improving diseases control, because it requires the use of appropriate methodologies (ANTUNIASSI et al, 2011), which might explain the high percentage of non-respondents to this question. answers obtained by the adjuvants using in the spray applications.…”

Section: Resultsmentioning

confidence: 99%

“…There are many alternatives to reduce drift like the correct choice of spray nozzles, applications under suitable climatic conditions and the use of spray adjuvants (ANTUNIASSI et al, 2011;HILZ & VERMEER, 2013;MOTA et al, 2013;GANDOLFO et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Knowledge on Adjuvant Properties, Disposal of Pesticideresidues and Spray Drift Occurrence in the State of Mato Grosso

et al. 2016

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This paper aimed at investigating the knowledge level of people working on pesticide spraying activities concerning spray adjuvant properties, as well as collecting information on disposal locations for residues from internal spray tank cleaning, and finally the understanding of pesticide spray drift occurrence in the state of Mato Grosso, Brazil. The information was gathered through a questionnaire answered by participants of a rural extension program in application technology located in nineteen grain and fiber producing regions of Mato Grosso state. Among the mentioned adjuvants, 49.0% belonged to the mineral oil class and 17.9% of participants did not know the functions performed by such products. In addition, 58.5% of the participants discarded residues into the field. Among the participants who answered the question about spray drift occurrence causes, 54.1% indicated problems relating to inadequate weather conditions. In conclusion, there is a lack of knowledge on adjuvant functions, besides of inappropriate residue disposal in the state of Mato Grosso. Spray drift was referred as a problem; however, most of participants were not able to discuss the causes of these losses.KEYWORDS: pesticides, spraying, environmental safety, application technology. CONHECIMENTO SOBRE ADJUVANTES, DESCARTE DE RESÍDUOS EOCORRÊNCIA DE DERIVA NO ESTADO DO MATO GROSSO RESUMO: O objetivo deste trabalho foi investigar o nível de conhecimento de trabalhadores ligados à atividade de aplicação de defensivos agrícolas sobre as funções de adjuvantes de calda e coletar informações sobre os locais de descarte dos resíduos provenientes da lavagem interna do reservatório de calda de pulverizadores, ocorrência e motivos da deriva, nas aplicações de defensivos agrícolas, no Estado do Mato Grosso. As informações foram coletadas por meio das respostas de um questionário entregue aos participantes de um programa de extensão rural, em tecnologia de aplicação, em dezenove municípios produtores de grãos e fibras do Estado. Ao todo, 49,0% dos adjuvantes citados pertenciam à classe dos óleos minerais e 17,9% dos participantes declararam não saber as funções desempenhadas pelos adjuvantes. Os resíduos eram descartados nas lavouras por 58,5% dos participantes. Dentre os participantes que responderam sobre as causas da ocorrência de deriva nas aplicações, 54,1% indicaram problemas relativos às condições climáticas inadequadas. Conclui-se que há carência de conhecimento sobre as funções desempenhas pelos adjuvantes, bem como a ocorrência de descarte de resíduos em locais inadequados no Estado do Mato Grosso. A deriva foi reconhecida como um problema, mas a maioria dos participantes não se propôs a discutir as causas deste tipo de perda.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Knowledge on Adjuvant Properties, Disposal of Pesticideresidues and Spray Drift Occurrence in the State of Mato Grosso

et al. 2016

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Viscosity, surface tension and droplet size of sprays of different formulations of insecticides and fungicides

Carvalho¹,

Antuniassi

Chechetto

et al. 2017

Crop Protection

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The influence of three types of commercial formulation of insecticides and fungicides, emulsifiable concentrate (EC) formulation, suspension concentrate (SC) formulation and water dispersible granule (WG) formulation on the surface tension, viscosity and the droplet size spectra of sprays was evaluated using thirty commercial insecticide and fungicide products. The concentration of sprays was based on application water spray volume of 50 L ha À1 using an XR 8003VS flat fan nozzle, operated at 200 kPa pressure. The lowest surface tensions were obtained with EC formulations, while the SCs had the highest viscosities. Emulsions were the most effective at decreasing the percentage of droplets smaller than 100 mm and relative span, while increasing the DV 0.1 and DV 0.5 values than the dispersion-type formulations, represented by WG and SC formulations. These factors should be considered for planning spray applications and reducing drift.

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Blade Angle Effect on Droplet Size Spectrum of Rotary Atomizers Used in Brazil

et al. 2016

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ABSTRACT:The effect of blade angle on droplet size spectrum of five rotary cage atomizers and one rotary disc atomizer used in Brazil was evaluated in a high speed wind tunnel, with an air speed of 180 km h -1 . This study included the characterization of the droplet size spectrum, via laser diffraction instrument, generated by three blades angles, of 45, 60 and 75 degrees. The spray solution was composed of Picoxystrobin + Cyproconazole fungicide (SC), at 20 mL c.p. L -1 , and at a flow rate of 6 L min -1 . As the angle decreased from 75 to 45 degrees, the rotational speed of the atomizers increased and the volume median diameter (VMD) decreased. However, increasing the rotational speed also increased the percentage of droplets smaller than 100 µm (% < 100 µm). At the blade angles of 45 and 60 degrees the atomizers showed that % < 100 µm was higher than 20% and VMD was smaller than 198 µm. The disc type atomizer resulted in the lower values of relative span (RS). The use of 75 degrees blade angle produced the highest values of VMD and the lowest values of % < 100 µm; these parameters were also affected by atomizer model and brand.

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Systems of aerial spraying for soybean rust control

Cited by 8 publications

References 7 publications

Knowledge on Adjuvant Properties, Disposal of Pesticideresidues and Spray Drift Occurrence in the State of Mato Grosso

Knowledge on Adjuvant Properties, Disposal of Pesticideresidues and Spray Drift Occurrence in the State of Mato Grosso

Viscosity, surface tension and droplet size of sprays of different formulations of insecticides and fungicides

Blade Angle Effect on Droplet Size Spectrum of Rotary Atomizers Used in Brazil

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