Characteristics and Challenges of Pesticide Spray Applications in Mato Grosso, Brazil

Carvalho, Fernando Kassis; Chechetto, Rodolfo Glauber; Mota, Alisson Augusto Barbieri; Antuniassi, Ulisses Rocha

doi:10.1564/v28_feb_02

Cited by 13 publications

(9 citation statements)

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“…The concentration of the pesticide in water was determined according to the label recommendations, prioritizing those for controlling Asian soybean rust (Phakopsora pachyrhizi Sydow & P. Sydow), to fungicides, and velvetbean caterpillar (Anticarsia gemmatalis Hübner), to insecticides, both for the use in soybeans (Glycine max (L.) Merril) with application volumes of 50 L ha À1 . This volume application rate is commonly used in some regions of Brazil for ground applications (Chechetto et al, 2014;Carvalho et al, 2017).…”

Section: Methodsmentioning

confidence: 99%

“…Because of the need for good coverage and penetration in the canopy, most applications are done using smaller droplets (usually from very fine to medium spray quality), most frequently using standard flat fan nozzles. Dual flat fan and hollow cone nozzles are also used to spray these pesticides, but because of the higher risk of spray drift (Chechetto et al, 2014;Carvalho et al, 2017) the adoption of these nozzles is decreasing.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Thus, considering that the change in displacement speed can interfere with the deposition (Peñazola et al, 2017), faster applications with lower volumes of spray mix may also have contributed to the smaller deposits observed in this study. It is important to emphasize that the application volumes used in cotton production regions are increasingly lower (Costa and Sofiatti, 2015;Carvalho et al, 2017). In this context, the scenario is worrisome especially when there is need for the application deposition to reach the middle and lower sectors of the plants.…”

Section: Effect Of Spraying Volume On Deposition On Cotton Leavesmentioning

confidence: 99%

“…Additionally, the tendency of reducing the application volume for gains in operational capacity may contribute to lower droplet deposition and consequently, makes the applications less effective, requiring greater knowledge about the effect of these operational conditions. In the state of Mato Grosso, which is the main cotton producing state in Brazil (CONAB, 2018), the average application volume used by producers has been decreased from 119 to 80 L ha -1 between 2008 and 2016 (Carvalho et al, 2017). In addition to the factors related to the sprayer, phytosanitary applications during the reproductive stages can make the arrival of biological targets even more difficult in certain plant sectors, especially for fungicides and insecticides.…”

Section: Introductionmentioning

confidence: 99%

Spraying deposits using different nozzles and application volumes for pest management of cotton at reproductive stage

et al. 2019

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With the growing need for greater operational capacity, information about the effect of application volume and spray nozzles on the quality of pesticide application are essential to obtain greater efficiency in pest management in cotton crops. This study aimed to assess the effect of the spraying volume and nozzles on the deposition of spray solution on cotton crops at the reproductive stage. The treatments of the first experiment correspond to the 55, 67, 140 and 194 L ha-1 volumes obtained by variation of the displacement speed using the XR11004 flat fan nozzle. In the second assay the treatments corresponded to the applications of MGA9004 (hollow cone), XR11004 (flat fan), AIXR11004 (air induction flat fan) and CVIA04 (air induction hollow cone) nozzles with 120 L ha-1. An artificial brilliant blue food dye (FD&C 1) was used as a tracer (2.5 g L-1) to determine the deposited volumes on the leaves of the upper, middle and lower third of cotton plants. The results showed that increase in the application volume contributed to obtain the larger deposits in the upper third of the cotton crop during its reproductive phase, especially up to 140 L ha-1, but did not exhibit a significant increase of the deposition in the middle and lower thirds of the plants. The MGA9004, XR11004 and AIXR11004 nozzles provided the largest deposits in the three plant sectors. The flat fan nozzles resulted in greater uniformity of deposits in the upper and middle thirds of the plants.

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“…This sector generates jobs and income for a large part of the population. However, tropical conditions, monoculture practice, the extension of agricultural areas, and intensive agriculture generate environments conducive to increased frequency and intensity of phytosanitary problems (Petter et al, 2012;Carvalho et al, 2017). Consequently, the frequency of pesticide use is higher than the average found in high latitude countries (Gazziero, 2015).…”

Section: Introductionmentioning

confidence: 99%

Physical Compatibility and Stability of Pesticide Mixtures at Different Spray Volumes

et al. 2019

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Available information on physical compatibility and stability of pesticide mixtures is scarce and often divergent. This knowledge is of fundamental importance in the success of pest, disease, and weed control programs. Compatibility and stability of two glyphosate formulations (WG and SL) in a mixture with fluazinam + deltamethrin + trifloxystrobin/cyproconazole at four diluted water concentrations and different times were evaluated under laboratory conditions. The evaluations were performed at the following time intervals: immediately after mixing and 1, 5, 10, 30, 120, 900, and 1,440 minutes after the mixing of pesticides. Scores were assigned on a scale ranging from 1 to 5, where 1 meant immediate separation of compounds and 5 the perfect mixture stability up to 30 minutes. The data were submitted to descriptive statistics and presented in tables. Mixture stability differed in glyphosate formulations and their concentrations due to the used spray solution volume. Distinct mixtures between glyphosate (SL) and deltamethrin, as well as between glyphosate (WG) and deltamethrin, were physically compatible when stirred again even after 24 hours at rest. The mixture containing glyphosate (SL), deltamethrin, and fluazinam and trifloxystrobin/ cyproconazole was incompatible at a volume of 30 L ha-1.

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Characteristics and Challenges of Pesticide Spray Applications in Mato Grosso, Brazil

Cited by 13 publications

References 0 publications

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

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

Spraying deposits using different nozzles and application volumes for pest management of cotton at reproductive stage

Physical Compatibility and Stability of Pesticide Mixtures at Different Spray Volumes

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