Navegando por Autor "Alvarenga, Cleyton Batista de"

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Application rate and hydraulic tips used in remotely piloted aircraft affect the phytosanitary products in coffee plant canopies
(Editora da Universidade Estadual de Maringá - EDUEM, 2024) Alvarenga, Cleyton Batista de; Zampiróli, Renan; Cunha, João Paulo Arantes Rodrigues da; Rinaldi, Paula Cristina Natalino; Cunha, Bruno Amâncio da; Faria, Layanara Oliveira
Most coffee (Coffea arabica) phytosanitary management techniques are performed using ground-based equipment, and remotely piloted aircraft are a recent alternative. Therefore, this study evaluates the effect of different application rates and hydraulic tips used for spreading phytosanitary products on coffee crops using a remotely piloted aircraft, assisted by artificial targets and dye tracing. The experiment was a 4 × 3 factorial randomized block design with four tips (XR 110-01, TT 110-01, AIXR 110- 015, and TTJ60 110-02) and three application rates (8, 12, and 16 L ha-1 ). Hydrosensitive paper was used to analyze the droplet spectrum, and the Brilliant Blue tracer was used to detect spray deposition. The DJI Agras T20 remotely piloted aircraft was used to apply the phytosanitary product. Speed, flight height, and application range were maintained at 5.56 m s-1 , 2 m, and 5 m, respectively. The flight direction was perpendicular to the crop planting lines. The application rate and hydraulic tip jointly controlled the accumulation of droplets on the target according to its position in the plant canopy. Therefore, remotely piloted aircraft can be used in coffee phytosanitary management, particularly to control targets that predominately occur in the upper third of the plant canopy.
Application technology for chemically controlling coffee leaf miner in the cerrado of Minas Gerais State
(Universidade Federal Rural da Amazônia (UFRA), 2017) Zampiroli, Renan; Alvarenga, Cleyton Batista de; Andaló, Vanessa; Rinaldi, Paula Cristina; Assis, Gleice Aparecida de
Leaf miner is a major coffee tree pest that causes severe losses. Most farmers perform chemical control in an attempt to reduce damage to the crop. Thus, the current study aims to analyze spraying efficiency and control effectiveness according to the management plan adopted in a coffee farm in the Cerrado of Minas Gerais. The application used Arbus sprayer, model 2,000, at the pressure of 600 kPa. The droplet spectrum was analyzed using water-sensitive paper. The plant architecture influence on the application quality was evaluated through the droplet spectrum and control efficacy. We conclude that the plant crown height and depth affected application efficiency. Spraying was an effective phytosanitary control of coffee leaf miner, reaching 87.5% control efficiency ratio, considering that infestation was three times higher than that recommended for the applied pesticide at the time of application.
Desenvolvimento de mudas de cafeeiro em diferentes substratos e doses de fertilizante de liberação gradual
(2003) Guirelli, João Evangelista; Marcuzzo, Karina Velini; Melo, Benjamim de; Teodoro, Reges Eduardo Franco; Alvarenga, Cleyton Batista de; Gonçalves, Marcelo Vitor; Consórcio Brasileiro de Pesquisa e Desenvolvimento do Café
A produção de mudas de cafeeiro constitui-se num fator importante e até mesmo limitante da produtividade da cultura. Dentre os fatores que interferem na produção de mudas de cafeeiro com qualidade superior, o substrato e sua fertilização são fatores muito importantes, pois além de afetarem o crescimento e o desenvolvimento das mudas no viveiro, afetam também na implantação da lavoura. Com o objetivo de avaliar a eficácia de substratos e doses de fertilizante de liberação gradual dos nutrientes, desenvolveu-se um experimento em viveiro de cobertura alta da área do Setor de Cafeicultura do Instituto de Ciências Agrárias da Universidade Federal de Uberlândia - ICIAG - UFU, localizado na Fazenda Experimental do Glória, Br 050, Km 78, no período de setembro de 2002 a fevereiro de 2003. O delineamento experimental utilizado foi o de blocos casualizados, com os tratamentos distribuídos em esquema fatorial 2 x 5, com três repetições; sendo os fatores: 2 substratos (Plantmax e Bioplant) e 5 doses do fertilizante de liberação gradual (Osmocote), correspondentes a 0; 150; 300; 450 e 600 g do fertilizante por 55 L de substrato. Utilizou-se a formulação 15-10-10 + micronutrientes. A parcela foi constituída por dezesseis tubetes, adotando-se como área útil os quatro tubetes centrais. Foram utilizadas plântulas da cultivar Acaiá Cerrado, linhagem 1474, provenientes de sementeira de areia lavada, sendo a repicagem realizada quando as plântulas estavam no estádio de palito de fósforo. O controle de pragas e doenças foi realizado conforme a necessidade. Para a avaliação do desenvolvimento das mudas foram avaliadas as seguintes características: altura de planta, diâmetro de caule, número de pares de folhas, área foliar, matérias secas de parte aérea, do sistema radicular e total. Concluiu-se que o substrato Plantmax proporcionou um melhor desempenho das mudas de cafeeiro nas características diâmetro de caule, altura de planta, matérias secas da parte aérea, sistema radicular e total. Obteve-se maiores valores das características número de pares de folhas e diâmetro de caule quando as doses do fertilizante foram de 506,08 g e 435,04 g de Osmocote/55 L de substrato, respectivamente; para as demais características (altura de planta, matérias secas de parte aérea, de raiz, total e área foliar) houve resposta linear crescente com o aumento das doses do fertilizante.
Effect of air blast sprayer application speed on the dye retention of coffee leaves
(Universidade Federal de Viçosa, 2022-01-09) Alvarenga, Cleyton Batista de; Zampiroli, Renan; Rinaldi, Paula Cristina Natalino; Silva, Tulio Urban Lourenço Miranda
Improving the effectiveness of pesticide application for controlling insects, mites, and pathogens in coffee cultivation has been a major challenge for coffee farmers, researchers, and consultants. The present study aimed to assess the deposition and distribution of a brilliant blue tracer in the coffee canopy using Jacto’s Arbus 2000 Super Export EL and Kuhn’s Twister 2000 air blast sprayers at different application speeds (5 and 7 km h-1). The experiment was conducted using a randomized block design, with a 2 × 2 factorial arrangement (two sprayer models and two application speeds), with six replicates. After spraying, leaves were collected, and the deposition of the tracer was assessed using spectrophotometry. The canopy was divided into lower, middle, and upper heights, and subdivided into external and internal crown positions. The percentage difference in spray deposition between positions was termed relative spray deposition. Spray deposition in the internal crown differed only in the upper third section between sprayers. In the external crown, the application speed affected the deposition of tracer dye for both sprayers, whereas, in the internal crown, the application speed only affected the deposition of tracer dye in the upper crown section only when using the Arbus sprayer.
Effectiveness of coffee leaf miner control associated with spray deposition in coffee leaves
(Universidade Federal de Viçosa, 2020) Zampiroli, Renan; Alvarenga, Cleyton Batista de; Rinaldi, Paula Cristina Natalino; Andaló, Vanessa; Prado, Jair Rocha do; Gonçalves, Pablo Arthur Silva
Coffee production faces challenges due to the susceptibility of the crop to insects. Owing to the coffee leaf miner Leucoptera coffeella, which is one of the main insect pests, the technology for the application of phytosanitary measures becomes the main challenge for coffee growers. This study aimed to evaluate the effectiveness of coffee leaf miner control using different methods of application. The study was conducted in an experimental site in the municipality of Monte Carmelo – Minas Gerais. Spray depositions in different positions of the plant canopy and the effective control of coffee leaf miner were evaluated using the following application treatments: a hydropneumatic sprayer with varying spray volumes (200 and 400 L ha-1), two hollow-cone spray nozzles with the presence and absence of agricultural adjuvant, and electrostatic application using a spray volume of 200 L ha-1 with and without spray adjuvant. The addition of an adjuvant to the spray did not influence coffee leaf miner control; in contrast, a spray volume of 200 L ha-1 combined with the application of coarse droplets was efficient in the management of insect pest. The reduction in the rate of the application using coarse droplets increased the operational capacity and reduced spray drift potential.
Spray technology for deposition of droplets on coffee leaves and fruits
(Escola de Agronomia - UFG, 2021) Zampiróli, Renan; Alvarenga, Cleyton Batista de; Parenti, Matheus Vilhena; Cunha, João Paulo Arantes Rodrigues da; Celoto, Fernando Juari; Rinaldi, Paula Cristina Natalino; Sasaki, Robson Shigueaki
Para o sucesso do controle fitossanitário no cafeeiro, é importante uma correta deposição de calda ao longo do dossel. Contudo, a estrutura da planta dificulta essa distribuição. Objetivouse avaliar a deposição de um traçador em folhas e frutos, na cultura do café, em função da taxa de aplicação e do tipo de ponta de pulverização, bem como do emprego de um sistema de pulverização eletrostática. Utilizou-se pulverizador hidropneumático com pontas hidráulicas de jato cônico vazio, da série TVI (gotas grossas com indução de ar) e JA (gotas finas), em taxas de 200 e 400 L ha-1. Também foi avaliado um sistema eletrostático, com ponta SPE-2 e taxa de 200 L ha-1, instalado no mesmo pulverizador. Foram determinadas a deposição do traçador em folhas e frutos dos terços superior, médio e inferior das plantas, bem como as perdas para o solo na projeção da copa, mediante quantificação por espectrofotometria. Os resultados indicaram que a aplicação eletrostática proporciona maior deposição nas folhas do terço superior, em relação à aplicação hidropneumática, independentemente da taxa de aplicação. A ponta TVI produz maior deposição nos frutos do terço médio e maior perda para o solo, em relação à ponta JA. A taxa de aplicação de 400 L ha-1 promove maior deposição nos frutos do terço médio, em relação à de 200 L ha-1, mas também causa maior perda para o solo.
Use of different spray volumes and hydraulic nozzles in air-assisted electrostatic insecticide application technologies to control coffee berry borer (Hypothenemus hampei) populations
(Editora da Universidade Estadual de Maringá - EDUEM, 2022-03-09) Zampiroli, Renan; Parenti, Matheus Vilhena; Alvarenga, Cleyton Batista de; Celoto, Fernando Juari; Cunha, João Paulo Arantes Rodrigues da; Rinaldi, Paula Cristina Natalino
Chemical control is essential for efficient pest management in coffee crops. Application technologies should safely deliver insecticides to the target whilst protecting the environment, insecticide applicators, and consumers. To achieve these goals, application volumes, hydraulic nozzles, and application techniques should be evaluated. This study assessed the biological efficiency of different spray volumes and spray nozzles used to apply insecticides to control coffee berry borer (Hypothenemus hampei) populations. We applied insecticides using a hydropneumatic sprayer with and without an electrostatic spraying system. The experiment followed a randomized block factorial design (2 × 2 + 1) and included two types of spray nozzles [a hollow cone spray nozzle (JA1) and a hollow cone spray nozzle with air induction (TVI)], two spray volumes (200 and 400 L ha-1), one additional treatment (SPE2 nozzle with a 200 system 200 L ha-1), and six replicates. We assessed the control efficiency of the different application methods by evaluating the percentage of fruits damaged 20 and 40 days after the date of application. The spray volume did not affect the biological efficiency of pest control, and the lower spray volume (200 L ha-1) was effective in the control of coffee berry borers. Application of insecticides using coarse droplets was more efficient than the application using very fine and fine droplets. The TVI hydraulic spray nozzle effectively controlled coffee berry borers at 200 and 400 L ha-1. The electrostatic application system performed similarly to the conventional system in terms of the control of the coffee berry borers, and was less efficient than the conventional system under some operational conditions.