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Dr. João Paulo Cunha
Federal University of Uberlândia

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0 Precision Agriculture
0 Agricultural Mechanization
0 sprayer
0 application technology
0 UAV (Unmanned Aerial Vehicles)

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application technology
Precision Agriculture

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Journal article
Published: 01 August 2021 in Revista Brasileira de Engenharia Agrícola e Ambiental
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This study aimed to evaluate the dicamba residue after cleanout procedures in sprayers with different tank materials (fiberglass and polyethylene) and its effects on the symptomology of non-dicamba tolerant (DT) soybean. The experiment consisted of spraying rinsates collected during a cleanout of boom sprayers on non-DT soybean at the V3 stage. Once the dicamba solution was mixed in the sprayer tank and sprayed, four rinses were made, and for each rinse, a sample was collected. The dicamba residue analyses in each rinse solution were conducted in a completely randomized design with three replicates in a 2 × 4 factorial scheme, corresponding to two sprayer tank materials (fiberglass and polyethylene) and four rinses, using High-Performance Liquid Chromatograph (HPLC). The evaluation of the potential risk of injury on non-DT soybean caused by dicamba residue was conducted in a randomized block design with four replicates and a 2 × 4 + 1 factorial scheme, corresponding to two types of sprayer tank material (fiberglass and polyethylene), four rinses, and control (without application). The dicamba was effectively removed using at least three rinses regardless of spray tank material. Fiberglass tank sprayer retained more residue in the first rinsate, but similar to polyethylene tank sprayer in the following rinses. Plant height was reduced by spraying rinsates collected from the first rinse regardless of tank material. In contrast, visual estimation of injury and reduced yield were observed due to the rinsate application collected from the first and second rinses.

ACS Style

Matheus G. Marques; João Paulo A. R. da Cunha; Guilherme S. Alves. Dicamba residues in sprayers: Phytotoxicity on non-dicamba tolerant soybean. Revista Brasileira de Engenharia Agrícola e Ambiental 2021, 25, 1 .

AMA Style

Matheus G. Marques, João Paulo A. R. da Cunha, Guilherme S. Alves. Dicamba residues in sprayers: Phytotoxicity on non-dicamba tolerant soybean. Revista Brasileira de Engenharia Agrícola e Ambiental. 2021; 25 (8):1.

Chicago/Turabian Style

Matheus G. Marques; João Paulo A. R. da Cunha; Guilherme S. Alves. 2021. "Dicamba residues in sprayers: Phytotoxicity on non-dicamba tolerant soybean." Revista Brasileira de Engenharia Agrícola e Ambiental 25, no. 8: 1.

Journal article
Published: 03 May 2021 in AgriEngineering
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The recent availability of soybean cultivars with resistance to dicamba herbicide has increased the risk of injury in susceptible cultivars, mainly as a result of particle drift. To predict and identify the damage caused by this herbicide requires great accuracy. The objective of this work was to evaluate the injury caused by the simulated drift of dicamba on soybean (nonresistant to dicamba) plants assessed visually and using the Triangular Greenness Index (TGI) from images obtained from Remotely Piloted Aircraft (RPA). The study was conducted in a randomized complete block design with four replications during the 2019/2020 growing season, and the treatments consisted of the application of six doses of dicamba (0, 0.28, 0.56, 5.6, 28, and 112 g acid equivalent dicamba ha−1) on soybean plants at the third node growth stage. For the evaluation of treatments using the TGI technique, spectral data acquired through a Red Green Blue (RGB) sensor attached to an RPA was used. The variables studied were the visual estimation of injury, TGI response at 7 and 21 days after application, plant height, and crop yield. The exposure to the herbicide caused a reduction in plant height and crop yield. Vegetation indices, such as TGI, have the potential to be used in the evaluation of injury caused by dicamba, and may be used to cover large areas in a less subjective way than visual assessments.

ACS Style

Matheus Marques; João da Cunha; Ernane Lemes. Dicamba Injury on Soybean Assessed Visually and with Spectral Vegetation Index. AgriEngineering 2021, 3, 240 -250.

AMA Style

Matheus Marques, João da Cunha, Ernane Lemes. Dicamba Injury on Soybean Assessed Visually and with Spectral Vegetation Index. AgriEngineering. 2021; 3 (2):240-250.

Chicago/Turabian Style

Matheus Marques; João da Cunha; Ernane Lemes. 2021. "Dicamba Injury on Soybean Assessed Visually and with Spectral Vegetation Index." AgriEngineering 3, no. 2: 240-250.

Review paper
Published: 01 April 2021 in Engenharia Agrícola
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The use of remotely piloted aircrafts (RPAs) to apply plant protection products has grown a lot in agriculture worldwide. However, little research data are available regarding the efficiency and safety of this method, especially in Brazil. Thus, this review aimed to present the current scenario of scientific research involving RPAs in the application of pesticides. Several factors interfere with the quality of this type of application. Among them are height and flight speed, droplet generator elements, application rate, and spray solution properties. In general, applications have been performed between 1.0 m and 3.0 m of height and 1.0 m s-1 and 7.0 m s-1 of speed. As for the droplet generator element, there is still no clarity as to the ideal system. Efficacy studies involving RPA applications demonstrate the potential of this method in replacing applications performed mainly by using knapsack equipment in an effort to reduce occupational risks. However, it is essential to observe the advantages of RPA use, while also taking into account the risk of drift. The aerodynamic effect in the droplets, qualified personnel, appropriate formulations, regulations, and details in labels are challenges that still need to be addressed for this new technology to be successful.

ACS Style

João P. A. R. da Cunha; Cleyton B. de Alvarenga; Paula C. N. Rinaldi; Matheus G. Marques; Renan Zampiroli. USE OF REMOTELY PILOTED AIRCRAFTS FOR THE APPLICATION OF PLANT PROTECTION PRODUCTS. Engenharia Agrícola 2021, 41, 245 -254.

AMA Style

João P. A. R. da Cunha, Cleyton B. de Alvarenga, Paula C. N. Rinaldi, Matheus G. Marques, Renan Zampiroli. USE OF REMOTELY PILOTED AIRCRAFTS FOR THE APPLICATION OF PLANT PROTECTION PRODUCTS. Engenharia Agrícola. 2021; 41 (2):245-254.

Chicago/Turabian Style

João P. A. R. da Cunha; Cleyton B. de Alvarenga; Paula C. N. Rinaldi; Matheus G. Marques; Renan Zampiroli. 2021. "USE OF REMOTELY PILOTED AIRCRAFTS FOR THE APPLICATION OF PLANT PROTECTION PRODUCTS." Engenharia Agrícola 41, no. 2: 245-254.

Crop science
Published: 01 January 2021 in Pesquisa Agropecuária Brasileira
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The objective of this work was to evaluate injury symptoms on soybean not tolerant to dicamba (3,6-dichloro-2-methoxybenzoic acid), as well as crop yield, after the application of sub-rates of the herbicide to simulate physical drift in tropical conditions. Dicamba rates of 0, 5.8, 14.4, 28.8, 57.6, and 576 g acid equivalent per hectare were applied at the vegetative (V3) and reproductive (R1) stages of soybean, using a backpack sprayer pressurized with CO2, equipped with air-induction flat fan spray nozzles; the pressure and rate of application were 250 kPa and 200 L ha-1, respectively. Visible injury, the soil-plant analysis development (SPAD) index (leaf chlorophyll content) at 14 days after herbicide application, and soybean crop yield were evaluated. These variables were influenced by the crop stage in which the dicamba rates were applied. Rates below 28.8 g ha-1 caused less injury to soybean when applied at the R1 stage; however, there were no differences in yield between stages. A 1% dicamba drift in tropical conditions reduces soybean yield by 12%.

ACS Style

Guilherme Sousa Alves; João Paulo Arantes Rodrigues da Cunha; Sérgio Macedo Silva; Gustavo De Souza Vieira; Mariana Pistore Santos; Thiago Nunes Landim; Thales Cassemiro Alves. Phytotoxicity in soybean crop caused by simulated dicamba drift. Pesquisa Agropecuária Brasileira 2021, 56, 1 .

AMA Style

Guilherme Sousa Alves, João Paulo Arantes Rodrigues da Cunha, Sérgio Macedo Silva, Gustavo De Souza Vieira, Mariana Pistore Santos, Thiago Nunes Landim, Thales Cassemiro Alves. Phytotoxicity in soybean crop caused by simulated dicamba drift. Pesquisa Agropecuária Brasileira. 2021; 56 ():1.

Chicago/Turabian Style

Guilherme Sousa Alves; João Paulo Arantes Rodrigues da Cunha; Sérgio Macedo Silva; Gustavo De Souza Vieira; Mariana Pistore Santos; Thiago Nunes Landim; Thales Cassemiro Alves. 2021. "Phytotoxicity in soybean crop caused by simulated dicamba drift." Pesquisa Agropecuária Brasileira 56, no. : 1.

Scientific paper
Published: 01 December 2020 in Engenharia Agrícola
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For the successful application of phytosanitary products, it is essential to understand the spraying process well. The present work aims to evaluate the spectrum and speed of the droplets produced by different spray nozzle models with air induction, working under different operating conditions. The experiment was conducted using an entirely randomized design with five repetitions in a 3 × 3 × 3 factor scheme that incorporates three nozzle models (ADIA, AIXR, and GA), three nominal flows (0.76, 1.14, and 1.51 L min−1), and three operating pressures (200, 300, and 400 kPa). The spectrum and speed of the droplets were determined directly using a real-time droplet analyzer based on high-resolution image analysis. The spray nozzle model interfered with the results. The ADIA promoted Dv0.5 (VMD) higher than AIXR and GA, reaching differences of up to 90%. The increase in pressure promoted a reduction in the droplet size; however, there was no well-defined behavior for the relationship between the flow rate and droplet size. The ADIA and AIXR gave rise to greater uniformity of the droplets in most of the evaluated conditions. The increase in pressure promoted an increase in the speed of the droplets. However, the effect of the nozzle model on this parameter was dependent on the flow.

ACS Style

João P. A. R. Da Cunha; Jorge A. L. França; Cleyton B. De Alvarenga; Guilherme S. Alves; Ulisses R. Antuniassi. PERFORMANCE OF AIR INDUCTION SPRAY NOZZLE MODELS UNDER DIFFERENT OPERATING CONDITIONS. Engenharia Agrícola 2020, 40, 711 -718.

AMA Style

João P. A. R. Da Cunha, Jorge A. L. França, Cleyton B. De Alvarenga, Guilherme S. Alves, Ulisses R. Antuniassi. PERFORMANCE OF AIR INDUCTION SPRAY NOZZLE MODELS UNDER DIFFERENT OPERATING CONDITIONS. Engenharia Agrícola. 2020; 40 (6):711-718.

Chicago/Turabian Style

João P. A. R. Da Cunha; Jorge A. L. França; Cleyton B. De Alvarenga; Guilherme S. Alves; Ulisses R. Antuniassi. 2020. "PERFORMANCE OF AIR INDUCTION SPRAY NOZZLE MODELS UNDER DIFFERENT OPERATING CONDITIONS." Engenharia Agrícola 40, no. 6: 711-718.

Technical paper
Published: 01 August 2020 in Engenharia Agrícola
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The hardness and pH of the spray water can interfere with the weed control effectiveness with herbicides, but it is not clear the magnitude of this interference, mainly associating different levels of pH and hardness to different glyphosate formulations. This study aimed to evaluate the influence of hardness and pH, in association, of the water used in the application of two glyphosate formulations on the weed control effectiveness. The experiment was conducted in duplicate, in areas with a predominance of Digitaria horizontalis, under a randomized block design with a 4×4×2+1 factorial scheme, composed of four water hardness levels (70, 110, 230, and 430 ppm CaCO3), four pH levels (3.5, 4.5, 5.5, and 6.5), two glyphosate formulations (ammonium salt and potassium salt), and control without application, with four repetitions. The physicochemical characteristics of the spray solutions and the weed control effectiveness were evaluated at 7, 14, and 21 days after application (DAA). The water pH at the studied range did not interfere with the control effectiveness. The increase in hardness reduced the control at 7 DAA, but this difference was not noticed after 21 DAA. Glyphosate ammonium salt promoted higher control of D. horizontalis than that with potassium salt, regardless of water hardness and pH.

ACS Style

João P. A. R. Da Cunha; Roxanna P. Palma; Arthur C. De Oliveira; Matheus G. Marques; Cleyton B. De Alvarenga. WATER HARDNESS AND pH IN THE EFFECTIVENESS OF GLYPHOSATE FORMULATIONS. Engenharia Agrícola 2020, 40, 555 -560.

AMA Style

João P. A. R. Da Cunha, Roxanna P. Palma, Arthur C. De Oliveira, Matheus G. Marques, Cleyton B. De Alvarenga. WATER HARDNESS AND pH IN THE EFFECTIVENESS OF GLYPHOSATE FORMULATIONS. Engenharia Agrícola. 2020; 40 (4):555-560.

Chicago/Turabian Style

João P. A. R. Da Cunha; Roxanna P. Palma; Arthur C. De Oliveira; Matheus G. Marques; Cleyton B. De Alvarenga. 2020. "WATER HARDNESS AND pH IN THE EFFECTIVENESS OF GLYPHOSATE FORMULATIONS." Engenharia Agrícola 40, no. 4: 555-560.

Research article
Published: 01 January 2020 in Planta Daninha
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Background: The use of electrostatic spray has the potential to optimize pesticide applications; however, further studies are required to verify its effectiveness. Objective: The objective of this work was to evaluate the electrostatic application system for the chemical control of weeds with glyphosate and adjuvant in different carrier volumes. Methods: The physicochemical properties of the spray solution, charge/mass relations, spray deposition on weeds, losses to the soil, effectiveness of weed control, and spray drift were evaluated. The field experiment was designed to have randomized blocks with four replications in a 2x2x2+2 factorial: the presence or not of electrostatic spray; with and without adjuvant (soybean lecithin + propionic acid); two carrier volumes (50 and 90 L ha-1); a control without applications and a conventional spray rate (150 L ha-1) for additional treatments. The study was performed in duplicate. Results: The electrostatic system energized the droplets during the application of glyphosate and adjuvant; however, this did not influence the deposition on the weeds, the losses to the soil, and the drift. The adjuvant improved the effectiveness of weed control in various situations, changed the spray solution properties, and reduced the losses due to drift. Conclusions: The adjuvant used proved to be an important tool in application technology. The effectiveness of weed control, in general, was not influenced by the electrostatic system.

ACS Style

Saulo F. B. Campos; João P. A.R. Cunha; Heli H.T. Assunção; Thales C. Alves; César H.S. Zandonadi; Ernane M.Lemes. Efficacy of glyphosate applied using an electrostatic sprayer as affected by adjuvant and carrier volumes. Planta Daninha 2020, 38, 1 .

AMA Style

Saulo F. B. Campos, João P. A.R. Cunha, Heli H.T. Assunção, Thales C. Alves, César H.S. Zandonadi, Ernane M.Lemes. Efficacy of glyphosate applied using an electrostatic sprayer as affected by adjuvant and carrier volumes. Planta Daninha. 2020; 38 ():1.

Chicago/Turabian Style

Saulo F. B. Campos; João P. A.R. Cunha; Heli H.T. Assunção; Thales C. Alves; César H.S. Zandonadi; Ernane M.Lemes. 2020. "Efficacy of glyphosate applied using an electrostatic sprayer as affected by adjuvant and carrier volumes." Planta Daninha 38, no. : 1.

Agrarian sciences
Published: 01 January 2020 in Anais da Academia Brasileira de Ciências
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Several countries included the assessment of environmental drift contamination risk for the registration of pesticides. This practice is not yet totality effective in Brazil; however, due to the large number of pesticides in use, it is important to identify the real contamination risk during pesticide spraying. Therefore, this study determined the indices of environmental risks for exposure to drift from terrestrial applications of fungicides, herbicides, and insecticides that are used in soybean crops under Brazilian climate conditions and established buffer zones for the application of these products. Based on the three prediction drift models for soybeans in Brazil, risk indices were computed for aquatic organisms and terrestrial organisms according to the modelling procedures proposed by the POCER (Pesticide Occupation and Environmental Risk) and HAIR (Harmonized Environmental Indicators for Pesticide Risk) methodologies. In general, aquatic organisms are the most sensitive to drift contamination, being chlorothalonil, trifluralin and chlorpyrifos the ones that presented the higher risk indexes. No risk was found for earthworms; in contrast, the insecticides chlorpyrifos, spinosad and thiamethoxam presented risks to bees regardless of the nozzle (droplet size) used for the determination of the drift curve, resulting in the demand for different buffer zones.

ACS Style

Mariana R. Bueno; João Paulo A.R. Da Cunha. Environmental risk for aquatic and terrestrial organisms associated with drift from pesticides used in soybean crops. Anais da Academia Brasileira de Ciências 2020, 92, e20181245 .

AMA Style

Mariana R. Bueno, João Paulo A.R. Da Cunha. Environmental risk for aquatic and terrestrial organisms associated with drift from pesticides used in soybean crops. Anais da Academia Brasileira de Ciências. 2020; 92 (suppl 1):e20181245.

Chicago/Turabian Style

Mariana R. Bueno; João Paulo A.R. Da Cunha. 2020. "Environmental risk for aquatic and terrestrial organisms associated with drift from pesticides used in soybean crops." Anais da Academia Brasileira de Ciências 92, no. suppl 1: e20181245.

Journal article
Published: 01 January 2020 in Coffee Science
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Coffee plants (Coffea arabica L.) present dense foliage that obstruct the entering of pesticides inside the plant canopy uniformly. Adjust the application rate concerning the plant canopy volume can be a way to make the pesticide applications more efficient. The objective of this study was to evaluate the deposition of spray solution on coffee leaves with different volumes of plant canopy and different application rates; additionally, to determine the specific volume indexes for different coffee phenological stages. The studies of coffee leaf deposition were performed on commercial fields of C. arabica - Topázio MG 1190 and Catuaí Vermelho IAC 99 cultivars, in different months. Three volumes of vegetation ranging from 8.572 to 16.200 m3 ha-1 - obtained from the calculation of tree-row volume (TRV) performed in 20 plants - and five application rates (200, 300, 400, 600 and 800 L ha-1) and in each phenological stage (maturation, post-harvest, grain filling) were evaluated in a randomized block design with five replications. A bright blue marker was added to the spray solution to be detected by spectrophotometry in order to study the spray deposition and losses to the soil. After the treatment applications, ten coffee leaves corresponding to the 1st pair of leaf from an orthotropic branch of each third of the coffee plant (upper, middle, lower) were randomly collected. Petri dishes were used to evaluate the losses to the soil. The TRV and leaf density should be considered together in the definition of the application rate for coffee protection. It is also possible to reduce the application rate to values close to 200 L ha-1. The volume indexes for each coffee phenological stage were defined for proper canopy wetting and low losses to the soil.

ACS Style

Thales Cassemiro Alves; João Paulo Arantes Rodrigues Cunha; Guilherme Sousa Alves; Sérgio Macedo Silva; Ernane Miranda Lemes. Canopy volume and application rate interaction on spray deposition for different phenological stages of coffee crop. Coffee Science 2020, 15, 1 -14.

AMA Style

Thales Cassemiro Alves, João Paulo Arantes Rodrigues Cunha, Guilherme Sousa Alves, Sérgio Macedo Silva, Ernane Miranda Lemes. Canopy volume and application rate interaction on spray deposition for different phenological stages of coffee crop. Coffee Science. 2020; 15 ():1-14.

Chicago/Turabian Style

Thales Cassemiro Alves; João Paulo Arantes Rodrigues Cunha; Guilherme Sousa Alves; Sérgio Macedo Silva; Ernane Miranda Lemes. 2020. "Canopy volume and application rate interaction on spray deposition for different phenological stages of coffee crop." Coffee Science 15, no. : 1-14.

Book chapter
Published: 01 November 2019 in Pesticide Formulation and Delivery Systems: 39th Volume, Innovative Formulation, Application and Adjuvant Technologies for Agriculture
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ACS Style

Guilherme Sousa Alves; Bruno C. Vieira; Fernando K. Carvalho; João Paulo A. R. Da Cunha; Ulisses R. Antuniassi; Greg R. Kruger. Droplet Spectrum from CP Nozzles Affected by Pressure, Flat-Fan, and Deflection Angles in Aerial Applications of Glyphosate. Pesticide Formulation and Delivery Systems: 39th Volume, Innovative Formulation, Application and Adjuvant Technologies for Agriculture 2019, 50 -63.

AMA Style

Guilherme Sousa Alves, Bruno C. Vieira, Fernando K. Carvalho, João Paulo A. R. Da Cunha, Ulisses R. Antuniassi, Greg R. Kruger. Droplet Spectrum from CP Nozzles Affected by Pressure, Flat-Fan, and Deflection Angles in Aerial Applications of Glyphosate. Pesticide Formulation and Delivery Systems: 39th Volume, Innovative Formulation, Application and Adjuvant Technologies for Agriculture. 2019; ():50-63.

Chicago/Turabian Style

Guilherme Sousa Alves; Bruno C. Vieira; Fernando K. Carvalho; João Paulo A. R. Da Cunha; Ulisses R. Antuniassi; Greg R. Kruger. 2019. "Droplet Spectrum from CP Nozzles Affected by Pressure, Flat-Fan, and Deflection Angles in Aerial Applications of Glyphosate." Pesticide Formulation and Delivery Systems: 39th Volume, Innovative Formulation, Application and Adjuvant Technologies for Agriculture , no. : 50-63.

Scientific paper
Published: 01 October 2019 in Engenharia Agrícola
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Adjuvants are tools to maximize pesticide spray quality. This study aimed to evaluate the interaction effects between adjuvants and the fungicide azoxystrobin + benzovindiflupyr on the physicochemical characteristics, droplet evaporation time, and spray droplet size. The experiment was carried out using a 2×6 factorial scheme, in which the first factor was the absence or presence of the fungicide mixture (water or water + fungicide) and the second factor was the presence of different adjuvants (water and five adjuvants). The parameters evaluated were surface tension, pH, viscosity, electrical conductivity, droplet evaporation time, volume median diameter, percentage of droplets smaller than 100 μm, and relative amplitude of the droplet spectrum. The silicone and propionic acid + soy lecithin adjuvants reduced the pH of the spray solution, and the sodium lauryl ether sulfate, propionic acid + soy lecithin, and orange essential oil adjuvants reduced droplet evaporation when mixed with the fungicide. All tested adjuvants improved spray quality related to the characteristics of the droplet spectrum, reducing the percentage of droplets smaller than 100 μm, and allowing more uniform droplet size. The fungicide azoxystrobin + benzovindiflupyr affected droplet evaporation time.

ACS Style

Thiago N. Landim; João P. A. R. Da Cunha; Guilherme S. Alves; Matheus G. Marques; Sérgio M. Silva. INTERACTIONS BETWEEN ADJUVANTS AND THE FUNGICIDE AZOXYSTROBIN+BENZOVINDIFLUPYR IN HYDRAULIC SPRAYING. Engenharia Agrícola 2019, 39, 600 -606.

AMA Style

Thiago N. Landim, João P. A. R. Da Cunha, Guilherme S. Alves, Matheus G. Marques, Sérgio M. Silva. INTERACTIONS BETWEEN ADJUVANTS AND THE FUNGICIDE AZOXYSTROBIN+BENZOVINDIFLUPYR IN HYDRAULIC SPRAYING. Engenharia Agrícola. 2019; 39 (5):600-606.

Chicago/Turabian Style

Thiago N. Landim; João P. A. R. Da Cunha; Guilherme S. Alves; Matheus G. Marques; Sérgio M. Silva. 2019. "INTERACTIONS BETWEEN ADJUVANTS AND THE FUNGICIDE AZOXYSTROBIN+BENZOVINDIFLUPYR IN HYDRAULIC SPRAYING." Engenharia Agrícola 39, no. 5: 600-606.

Scientific paper
Published: 01 September 2019 in Engenharia Agrícola
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Tree crops, such as Arabica coffee (Coffea arabica L.), present enormous technical challenges in terms of pesticide application. The correct deposition and distribution of the active ingredient throughout the aerial part of these plants depends on knowledge of the canopy volume, but manually determining this volume is time consuming and imprecise. The objectives of this study were to develop a method to determine the vegetation volume of coffee crops from digital images captured by camera onboard unmanned aerial vehicles and to compare this approach with traditional vegetation volume estimation (tree row volume (TRV) method). Manual measurements of the canopy volume of four coffee cultivation areas were compared with data obtained using the method presented in this paper. It was concluded that the vegetation volume of coffee trees, a highly important variable in defining pesticide application techniques (in addition to other uses), could be determined in a practical and precise way by digitally processing the images captured by unmanned aerial vehicles. The method is fast and permits the assessment of large areas. Furthermore, estimates based on this method and the traditional TRV method were not significantly different.

ACS Style

João P. A. R. Da Cunha; Matheus A. Sirqueira Neto; Sandro M. C. Hurtado. ESTIMATING VEGETATION VOLUME OF COFFEE CROPS USING IMAGES FROM UNMANNED AERIAL VEHICLES. Engenharia Agrícola 2019, 39, 41 -47.

AMA Style

João P. A. R. Da Cunha, Matheus A. Sirqueira Neto, Sandro M. C. Hurtado. ESTIMATING VEGETATION VOLUME OF COFFEE CROPS USING IMAGES FROM UNMANNED AERIAL VEHICLES. Engenharia Agrícola. 2019; 39 (spe):41-47.

Chicago/Turabian Style

João P. A. R. Da Cunha; Matheus A. Sirqueira Neto; Sandro M. C. Hurtado. 2019. "ESTIMATING VEGETATION VOLUME OF COFFEE CROPS USING IMAGES FROM UNMANNED AERIAL VEHICLES." Engenharia Agrícola 39, no. spe: 41-47.

Journal article
Published: 01 August 2019 in Engenharia Agrícola
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ACS Style

João P. A. R. da Cunha; Elton F. dos Reis; Heli H. T. de Assunção; Thiago N. Landim. EVALUATION OF DROPLET SPECTRA OF THE SPRAY TIP AD 11002 USING DIFFERENT TECHNIQUES. Engenharia Agrícola 2019, 39, 1 .

AMA Style

João P. A. R. da Cunha, Elton F. dos Reis, Heli H. T. de Assunção, Thiago N. Landim. EVALUATION OF DROPLET SPECTRA OF THE SPRAY TIP AD 11002 USING DIFFERENT TECHNIQUES. Engenharia Agrícola. 2019; 39 (4):1.

Chicago/Turabian Style

João P. A. R. da Cunha; Elton F. dos Reis; Heli H. T. de Assunção; Thiago N. Landim. 2019. "EVALUATION OF DROPLET SPECTRA OF THE SPRAY TIP AD 11002 USING DIFFERENT TECHNIQUES." Engenharia Agrícola 39, no. 4: 1.

Plant health
Published: 01 August 2019 in Revista Ceres
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Although tank mixture of pesticides and foliar fertilizers is common practice in agriculture, further clarification and scientific evidence is needed to support regulation. Thus, the objective of this work was to evaluate the effect of tank mixing an organosilicon adjuvant and manganese foliar fertilizer on the insecticide imidacloprid effectiveness against Triozoida limbata in guava trees. The experimental plot consisted of four consecutive trees in the same row subdivided into 4 quadrants. The experiment was arranged in a randomized block design with split plots, with four replications. Treatments were as follows: T1 - Imidacloprid (Imid.); T2 - Imid. + Polyether-polymethyl siloxane copolymer (Sil.); T3 - Imid. + MnSO4; T4 - Imid. + Sil. + MnSO4; and T5 - Control (no application). Physical-chemical characteristics, spray deposition on the leaves and losses to the soil, guava psyllid percentage of infestation and nymph’s number were evaluated. The addition of foliar fertilizer into the mixture decreased the pH and the surface tension and increased the electric conductivity and the viscosity of the insecticide solutions. The silicon adjuvant decreased the surface tension and increased the viscosity and the pH. The tank mixture of organosilicon adjuvant and manganese foliar fertilizer has no influence on the efficacy of the insecticide.

ACS Style

César Henrique Souza Zandonadi; Thales Cassemiro Alves; Heli Heros Teodoro De Assunção; Guilherme Sousa Alves; Sergio Macedo Silva; João Paulo Arantes Rodrigues Da Cunha. Tank mixture of pesticides and foliar fertilizers for Triozoida limbata control in guava trees (Psidium guajava L.). Revista Ceres 2019, 66, 297 -306.

AMA Style

César Henrique Souza Zandonadi, Thales Cassemiro Alves, Heli Heros Teodoro De Assunção, Guilherme Sousa Alves, Sergio Macedo Silva, João Paulo Arantes Rodrigues Da Cunha. Tank mixture of pesticides and foliar fertilizers for Triozoida limbata control in guava trees (Psidium guajava L.). Revista Ceres. 2019; 66 (4):297-306.

Chicago/Turabian Style

César Henrique Souza Zandonadi; Thales Cassemiro Alves; Heli Heros Teodoro De Assunção; Guilherme Sousa Alves; Sergio Macedo Silva; João Paulo Arantes Rodrigues Da Cunha. 2019. "Tank mixture of pesticides and foliar fertilizers for Triozoida limbata control in guava trees (Psidium guajava L.)." Revista Ceres 66, no. 4: 297-306.

Scientific paper
Published: 01 February 2019 in Engenharia Agrícola
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The use of insecticides is common in pest management in wheat crops but may lead to higher production costs and environmental contamination. Therefore, a more comprehensive and uniform distribution of plant protection products in the desired target is recommended. The objective of this study is to evaluate the effect of different spray nozzles, application rates, and adjuvants on droplet spectrum and spray deposition in wheat crops. The physicochemical characteristics of the spray mixture, droplet spectrum, and spray deposition in wheat plants were evaluated. The lower application rate (75 L ha−1) combined with the use of the twin flat fan tip AS7030 and the adjuvant sodium lauryl ether sulfate (SLES) yielded droplets with a larger diameter. However, insecticide spraying using hollow cone tip MGA 015 without adjuvants provided the highest percentage of droplets susceptible to drift. SLES significantly decreased the percentage of drift by increasing droplet size, and the adjuvant silicone, d-limonene, and polyester copolymer increased spray deposition. The evaluated adjuvants increased the electrical conductivity and reduced the surface tension of the spray mixtures. These results indicate that it is possible to reduce the application rate from 150 to 75 L ha−1 without affecting spray deposition on wheat leaves.

ACS Style

Willian A. Machado; Sérgio M. Silva; Stephan M. Carvalho; João P. A. R. Da Cunha. EFFECT OF NOZZLES, APPLICATION RATES, AND ADJUVANTS ON SPRAY DEPOSITION IN WHEAT CROPS. Engenharia Agrícola 2019, 39, 83 -88.

AMA Style

Willian A. Machado, Sérgio M. Silva, Stephan M. Carvalho, João P. A. R. Da Cunha. EFFECT OF NOZZLES, APPLICATION RATES, AND ADJUVANTS ON SPRAY DEPOSITION IN WHEAT CROPS. Engenharia Agrícola. 2019; 39 (1):83-88.

Chicago/Turabian Style

Willian A. Machado; Sérgio M. Silva; Stephan M. Carvalho; João P. A. R. Da Cunha. 2019. "EFFECT OF NOZZLES, APPLICATION RATES, AND ADJUVANTS ON SPRAY DEPOSITION IN WHEAT CROPS." Engenharia Agrícola 39, no. 1: 83-88.

Research article
Published: 01 January 2019 in Pesquisa Agropecuária Tropical
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With the epidemic onset of the sugarcane orange rust, fungicide applications of the Strobilurins and Triazoles groups have become necessary in susceptible varieties. This study aimed at evaluating the operational conditions of fungicide application in sugarcane (SP81-3250 variety), in relation to the spray deposition on the upper canopy and the effectiveness of the orange rust control. Treatments consisted of two application volumes (30 L ha-1 or 40 L ha-1) and three nozzle deflection angles (0 º, 90 º or 135 º), plus a ground application at the rate of 200 L ha-1, sprayed with a uniform flat spray nozzle of air induction. The ground application resulted in the smallest and the greatest spray deposition on sugarcane leaves and on the soil, respectively. The aerial application at the rate of 30 L ha-1, sprayed by hollow cone nozzles, at a deflection angle of 135 º, provided the best sugarcane orange rust control.

ACS Style

Thales Cassemiro Alves; João Paulo Arantes Rodrigues Da Cunha; Rafael Marcão Tavares; Guilherme Sousa Alves; Sérgio Macedo Silva. Fungicide application technology for controlling the sugarcane orange rust. Pesquisa Agropecuária Tropical 2019, 49, 1 .

AMA Style

Thales Cassemiro Alves, João Paulo Arantes Rodrigues Da Cunha, Rafael Marcão Tavares, Guilherme Sousa Alves, Sérgio Macedo Silva. Fungicide application technology for controlling the sugarcane orange rust. Pesquisa Agropecuária Tropical. 2019; 49 ():1.

Chicago/Turabian Style

Thales Cassemiro Alves; João Paulo Arantes Rodrigues Da Cunha; Rafael Marcão Tavares; Guilherme Sousa Alves; Sérgio Macedo Silva. 2019. "Fungicide application technology for controlling the sugarcane orange rust." Pesquisa Agropecuária Tropical 49, no. : 1.

Diseases control
Published: 01 June 2018 in Pesquisa Agropecuária Brasileira
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The objective of this work was to evaluate the spray drift and droplet spectrum of dicamba applied alone or with potential drift-reducing adjuvants, using air-induction flat fan nozzles. Standard (XR and TT) and air-induction (AIXR and TTI) nozzles were evaluated in a wind tunnel. The adjuvants used were polymer, ammonium sulfate, vegetable oil, and phosphatidylcholine. The applications were conducted at 276 kPa pressure and 3.5 m s-1 wind speed. The droplet spectrum was measured using a laser diffraction system. Round strings were used as drift collectors, positioned perpendicularly to the wind direction, at 2, 3, 4, 5, 6, 7, and 12 m from the nozzle. Drift was calculated by quantifying, through fluorimetry, a fluorescent tracer added to each solution at 1 g L-1. Droplet spectrum and dicamba drift depend on the interaction between spray composition and nozzle type. Air-induction nozzles are more recommended for dicamba applications, especially the TTI nozzle. Polymer and ammonium sulfate increase droplet size in all nozzle types, which may reduce drift to nearby crops.

ACS Style

Guilherme Sousa Alves; Greg Robert Kruger; João Paulo Arantes Rodrigues Da Cunha. Spray drift and droplet spectrum from dicamba sprayed alone or mixed with adjuvants using air-induction nozzles. Pesquisa Agropecuária Brasileira 2018, 53, 693 -702.

AMA Style

Guilherme Sousa Alves, Greg Robert Kruger, João Paulo Arantes Rodrigues Da Cunha. Spray drift and droplet spectrum from dicamba sprayed alone or mixed with adjuvants using air-induction nozzles. Pesquisa Agropecuária Brasileira. 2018; 53 (6):693-702.

Chicago/Turabian Style

Guilherme Sousa Alves; Greg Robert Kruger; João Paulo Arantes Rodrigues Da Cunha. 2018. "Spray drift and droplet spectrum from dicamba sprayed alone or mixed with adjuvants using air-induction nozzles." Pesquisa Agropecuária Brasileira 53, no. 6: 693-702.

Scientific paper
Published: 01 January 2018 in Engenharia Agrícola
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Farmers are seeking pesticide treatments with lower application rates and higher travel speeds. However, this can lead to a poor quality of the application. The aim of this study was to evaluate the spray deposition on soybean crop and the droplet spectra using different application rates and speeds. The experiment was conducted in soybean (R5 stage), M 6410 IPRO variety. Six treatments involving two application rates (80 and 150 L ha-1) and three speeds (10, 15 and 20 km h-1) were evaluated through a self-propelled sprayer. A characterization study of the spray droplets was conducted through the evaluation of water sensitive papers. The spray deposition study was carried out. For this, a marker was added to the application to be detected by absorbance in spectrophotometry. The use of spray nozzles with higher nominal flow, as well as lower pressures, produced droplets of larger sizes. The application rate of 80 L ha-1 provided equal and higher spray retention in the lower and upper leaves of the plants, respectively. The three speeds did not influence the deposition on soybean plants.

ACS Style

João P. A. R. Da Cunha; Arthur P. Victor; Caroline G. R. Sales. SPRAY DEPOSITION ON SOYBEAN CROP USING DIFFERENT TRAVEL SPEEDS AND APPLICATION RATES. Engenharia Agrícola 2018, 38, 82 -87.

AMA Style

João P. A. R. Da Cunha, Arthur P. Victor, Caroline G. R. Sales. SPRAY DEPOSITION ON SOYBEAN CROP USING DIFFERENT TRAVEL SPEEDS AND APPLICATION RATES. Engenharia Agrícola. 2018; 38 (1):82-87.

Chicago/Turabian Style

João P. A. R. Da Cunha; Arthur P. Victor; Caroline G. R. Sales. 2018. "SPRAY DEPOSITION ON SOYBEAN CROP USING DIFFERENT TRAVEL SPEEDS AND APPLICATION RATES." Engenharia Agrícola 38, no. 1: 82-87.

Journal article
Published: 01 January 2018 in Bioscience Journal
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ACS Style

Thales Cassemiro Alves; João Paulo Arantes Rodrigues Da Cunha; Ernane Miranda Lemes; Renata Leandra De Almeida Castro; João Eduardo Ribeiro Da Silva; Cesar Henrique Souza Zandonadi. Physiological changes in sugarcane in function of air and ground application of fungicide for orange rust control. Bioscience Journal 2018, 34, 603 -614.

AMA Style

Thales Cassemiro Alves, João Paulo Arantes Rodrigues Da Cunha, Ernane Miranda Lemes, Renata Leandra De Almeida Castro, João Eduardo Ribeiro Da Silva, Cesar Henrique Souza Zandonadi. Physiological changes in sugarcane in function of air and ground application of fungicide for orange rust control. Bioscience Journal. 2018; 34 (3):603-614.

Chicago/Turabian Style

Thales Cassemiro Alves; João Paulo Arantes Rodrigues Da Cunha; Ernane Miranda Lemes; Renata Leandra De Almeida Castro; João Eduardo Ribeiro Da Silva; Cesar Henrique Souza Zandonadi. 2018. "Physiological changes in sugarcane in function of air and ground application of fungicide for orange rust control." Bioscience Journal 34, no. 3: 603-614.

Agricultural sciences
Published: 01 December 2017 in Ciência e Agrotecnologia
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For an important and expensive crop such as corn, the resistance of Spodoptera frugiperda J.E. Smith to various pesticides has led to research throughout the world for a potential insecticide from a natural source. For the management of pest resistance, natural compounds associated with synthetic insecticides can be a promising tool because they can reduce the application of the synthetics molecules while maintaining their effectiveness and promoting the control of the pests. Linalool is a potential insecticide that is easily obtained because it is found in high concentrations in the essential oil of Ocimum basilicum L. Therefore, the present study aimed to evaluate the toxicity of this essential oil and its combination with deltamethrin to control S. frugiperda. Through dose response assays, the acute toxicities (LD50) of the essential oil and deltamethrin were estimated. Additionally, the combination of these materials was also assessed, attaining a reduction of 80% of the LD50 of deltamethrin while obtaining the same result as when the pyrethroid was administered alone. From these results, it is expected that the combination of natural compounds and synthetic insecticides will be a promising practice, helping to manage resistance while reducing the environmental impact of toxic compounds.

ACS Style

Sérgio Macedo Silva; João Paulo Arantes Rodrigues Da Cunha; Stephan Malfitano De Carvalho; César Henrique Souza Zandonadi; Rafael Castro Martins; Roberto Chang. Ocimum basilicum essential oil combined with deltamethrin to improve the management of Spodoptera frugiperda. Ciência e Agrotecnologia 2017, 41, 665 -675.

AMA Style

Sérgio Macedo Silva, João Paulo Arantes Rodrigues Da Cunha, Stephan Malfitano De Carvalho, César Henrique Souza Zandonadi, Rafael Castro Martins, Roberto Chang. Ocimum basilicum essential oil combined with deltamethrin to improve the management of Spodoptera frugiperda. Ciência e Agrotecnologia. 2017; 41 (6):665-675.

Chicago/Turabian Style

Sérgio Macedo Silva; João Paulo Arantes Rodrigues Da Cunha; Stephan Malfitano De Carvalho; César Henrique Souza Zandonadi; Rafael Castro Martins; Roberto Chang. 2017. "Ocimum basilicum essential oil combined with deltamethrin to improve the management of Spodoptera frugiperda." Ciência e Agrotecnologia 41, no. 6: 665-675.