Navegando por Autor "Gonçalves, Adenilson Henrique"

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Ação do herbicida 2,4 D sobre o crescimento de mudas de cafeeiro
(Embrapa Café, 2015) Voltolini, Giovani Belutti; Castanheira, Dalyse Toledo; Gonçalves, Adenilson Henrique; Silva, Lucas Guedes; Nascimento, Thales Lenzi Costa; Netto, Pedro Menicucci
A obtenção de sucesso na condução das lavouras depende diretamente da produção, da redução de custos e também de aspectos relacionados com a nutrição, com o controle de pragas e doenças, e também com a ocorrência de plantas daninhas. No manejo das plantas daninhas, o controle químico, por meio da utilização de herbicidas, vem sendo muito utilizado pela grande eficiência e pelo amplo espectro de controle. Entretanto, a eficiência deste tipo de controle depende diretamente de uma correta tecnologia de aplicação. Todavia, mesmo com a preocupação com fatores que interferem na aplicação, são frequentes casos de fitotoxidez causada por herbicidas em diversas culturas. Objetivou-se com este trabalho avaliar os efeitos causados pela deriva do herbicida 2,4 D em mudas de cafeeiro. O experimento foi realizado no Setor de Cafeicultura da Agência de Inovação do Café – INOVACAFÉ, na Universidade Federal de Lavras – UFLA, no ano de 2014. Foram utilizadas mudas de cafeeiro (Coffea arabica L.) da cultivar Mundo Novo. Foi utilizado o delineamento de blocos casualizados, com quatro repetições, e seis doses do herbicida 2,4 D: (i) 0%; (ii) 10%; (iii) 40%; (iv) 70%; (v) 100% e (vi) 200% da dose comercial recomendada de 2,4D, que é de 2,5 litros.ha-1. Cada parcela foi composta por cinco mudas. As mudas permaneceram no campo por 45 dias após a aplicação do herbicida. A identificação e observaçãodos sintomas causados pela ação do herbicida foram realizadas a cada dois dias. Ao final do experimento foi determinada a altura, o número de folhas, o diâmetro de caule e massa seca da parte aérea das plantas. Assim como para número de folhas e altura de plantas, verifica-se que a massa seca da parte aérea das plantas segue uma tendência cúbica de acordo com as doses do herbicida, sendo que, maiores doses influenciam negativamente as variáveis estudadas. Já em relação ao diâmetro de caule das mudas, não houve diferença significativa entre os tratamentos. A deriva do herbicida 2,4 D afeta o desenvolvimento de mudas de cafeeiro. Mudas de café intoxicadas pelo herbicida 2,4 D apresentam clorose e encarquilhamento das folhas, curvamento do caule (epinastia) e, posteriormente, rachamento do caule.
Phytotoxicity and leaf anatomy of young coffee plants subjected to herbicides exclusively and in associations
(Editora UFLA, 2020) Rodrigues, Rafael Jorge Almeida; Gonçalves, Adenilson Henrique; Menicucci Netto, Pedro; Carneiro, Arthur Henrique Cruvinel; Castanheira, Dalyse Toledo; Guimarães, Rubens José; Carvalho, Gladyston Rodrigues
The lack of work force and the damage that weeds can cause to coffee plants are the causes of the growing demand for selective herbicides to be used in coffee farming. Thus, the objective of this study was to evaluate the phytotoxicity symptoms and leaf anatomical characteristics of young coffee plants submitted to application isolated herbicides and also in associations. An experiment was carried out in a protected environment in randomized blocks: four replicates with coffee seedlings (Coffea arabica L.) cultivar “Topázio MG-1190”, grown in pots with a capacity of 11 liters of substrate. The herbicides applied, in isolation, were: pyrazosulfuron-ethyl (0.015 kg ha-1), saflufenacil (0.049 kg ha-1), imazetaphyr (0.1 kg ha-1), iodosulfuron-methyl (0.0035 kg ha-1), chlorimuron-ethyl (0.015 kg ha-1) and sethoxydim (0.184 kg ha-1). The latter was used in associations with the others. In addition, a control without herbicides was used. Phytotoxicity symptoms were evaluated up to 49 days after application (DAA) and anatomical characteristics at 65 DAA. Saflufenacil exclusively and inassociation with sethoxydim caused visual phytotoxicity symptoms in the leaves and negatively influence in the characteristics of the epidermis thickness of the adaxial face (EAD), thickness of the palisade parenchyma (PAP), thickness of the spongy parenchyma (SPP) and thickness of the mesophyll (MES). The other herbicides, isolated or in associations, didn’t cause phytotoxicity symptoms, but had negative influence in the anatomical parameters of the leaf blade. However they did not interfere with the paradermic parameters and the vascular bundle.
Quizalofop-P-ethyl controlling sourgrass (Digitaria insularis) and goosegrass (Eleusine indica) in infested coffee areas
(Editora UFLA, 2019-10) Vilela, Ximena Maira de Souza; Medeiros, Fernanda Carvalho Lopes de; Gonçalves, Adenilson Henrique; Silva, Lindomar Canuto da
Chemical control is the main weed management system in coffee crop. Herbicides alternatives controlling grass weeds in infested coffee areas are limited, mainly due to the few options of registered herbicides. Thus, it is important to evaluate selective post-emergence herbicide to control these important weeds in coffee crop. The objective in this work was to evaluate the selectivity, efficiency and agronomic viability of the herbicide quizalofop-P-ethyl compared to GLI OVER SL (glyphosate) on grass control in coffee crop. Two experiments were carried out in randomized blocks with four replicates in the municipality of Lavras and Santana da Vargem (MG - Brazil) in a commercial coffee crop cultivar “Mundo Novo” and “Catuai” to evaluate the herbicide effectiveness in the crop rows. The experimental design was a randomized block design with seven treatments and four replicates. Treatments consisted of the herbicide doses (25, 50, 75 and 100 g a.i. ha-1) compared to the standard glyphosate at the dose of 1,680 g a.i. ha-1 + Iharol at 0.5% v/v. Application occurred when sourgrass and goosegrass were at the beginning of development with up to 4 tillers (early vegetative stage) and in a second trial, at advanced stages of development (highly branched and /or flowering). Control assessments in percentage were performed at 7, 14, 21 and 28 days after application (DAA) of the treatments. A note of phytotoxicity was given following the European Weed Research Council (EWRC) patterns. The control of weeds was evaluated in each experimental plot using the visual notes scale, where: 0% represents no control, and 100% total control of the species in question, compared to the population present in the non-weed control. In general, the dose of 1,500 and 2,000 mL per hectare of quizalofop-p-ethyl (75 and 100 g a.i. ha-1) for the weeds at early vegetative stage presented the highest levels of controls (above 90%). The dose of 2,000 mL per hectare (100 g a.i. ha-1) was efficient at 28 DAA to control more developed plants. No symptoms of phytotoxicity caused by the herbicide quizalofop-P-ethyl were detected at any dose tested. Quizalofop-P-ethyl can be recommended for integrated weed management in coffee for sourgrass and goosegrass.
Selectivity of fluazifop-p-butyl in young coffee plants
(Editora UFLA, 2019-07) Voltolini, Giovani Belutti; Castanheira, Dalyse Toledo; Menicucci Netto, Pedro; Alecrim, Ademilson de Oliveira; Rezende, Tiago Teruel; Guimarães, Rubens José; Gonçalves, Adenilson Henrique
Weed control is fundamental in coffee cultivation due to their big interference, competing with the crop for water, light and nutrients. Among the control methods used, chemical control is highlighted, as a function of its high efficiency and low cost. However, due to application failures, herbicide drift phytotoxicity is common. Aiming at the search for selective active ingredients in coffee plants, the objective in this study was to evaluate the selectivity of the active ingredient Fluazifop- p-butyl on the young coffee plants, and its effects on plant morphology, anatomy and physiology. The experiment was carried out in a greenhouse, with ‘Topázio MG 1190’ coffee plants (Coffea arabica L.), cultivated in pots with a capacity of 11 L substrate. The statistical design was randomized block design (RBD), with four replications and four doses of the herbicide, making up 16 experimental plots. Each plot consisted of three plants. The treatments were: 0%; 50%; 100% and 200% of the recommended commercial dose of the herbicide Fluazifop-p-butyl. The evaluations were performed at 120 days after application of the treatments. Morphological, physiological and anatomical characteristics were evaluated. Regardless of the evaluated characteristic, there was no difference between the doses of the herbicide. There were no visual phytotoxicity symptoms in the young coffee plants that received the herbicide Fluazifop-p-butyl. The growth of the coffee plants and the physiological and anatomical characteristics were not altered due to the application of the herbicide Fluazifop-p-butyl.
Sintomas de fitotoxicidade e crescimento de mudas de silva, café submetidas aos herbicidas inibidores da protox
(Editora UFLA, 2017-07) Silva, Lucas Guedes; Castanheira, Dalyse Toledo; Voltolini, Giovani Belutti; Souza, Itamar Ferreira de; Gonçalves, Adenilson Henrique; Guimarães, Rubens José
Objetivou-se avaliar a influência dos herbicidas flumioxazin,oxyfluorfen e carfentrazone-ethyl no crescimento inicial de mudas de cafeeiro, sob condições de campo, identificando os sintomas de fitotoxicidade causados nas plantas. Os experimentos foram realizados em delineamento de blocos casualizados, com quatro repetições, e seis doses de herbicida (0%, 10%, 40%, 70%, 100% e 200% da dose recomendada). As aplicações foram feitas diretamente sobre as plantas por meio de um pulverizador costal pressurizado por CO 2 , regulado a 45 kgf/cm2. As mudas permaneceram no campo por 45 dias após as pulverizações, sendo realizada a identificação e observação dos sintomas de fitotoxicidade. A observação dos sintomas de fitotoxicidade foi feita a cada dois dias, por meio da captura de imagens e comparação das plantas que receberam os herbicidas com a testemunha. Ao final do experimento foram avaliados o número de folhas, o diâmetro de caule e a massa seca da parte aérea das plantas. Nos herbicidas oxyfluorfen, carfentrazone – ethyl e flumioxazim, a partir da dose de 10%, o principal sintoma de fitotoxicidade observado foi a formação de manchas necróticas irregulares no limbo foliar, principalmente nas regiões apicais. Os herbicidas oxyfluorfen e carfentrazone-ethyl, em todas as doses estudadas, apesar de causarem fitotoxicidade e injúrias leves nas mudas de cafeeiro, não afetaram o seu crescimento. O herbicida flumioxazin apresentou maior fitotoxicidade nas mudas, reduzindo significativamente seu crescimento em relação à testemunha, a partir da dose de 10%.
Sintomas de fitotoxidez em mudas de café causados pela ocorrência de deriva do herbicida Paraquat
(Embrapa Café, 2014) Castanheira, Dalyse Toledo; Souza, Itamar Ferreira de; Gonçalves, Adenilson Henrique; Carvalho, Raphael Comanducci da Silva; Santos, Milena Christy dos; Nascimento, Thales Lenzi Costa
Objetivou-se a identificação de sintomas de fitotoxidez em mudas de café causados pela ocorrência de deriva do Paraquat.