Fungicide spray coverage and deposition in soybean asian rust management

Detalhes bibliográficos
Autor(a) principal: Barbosa, Giselle Feliciani
Data de Publicação: 2019
Outros Autores: Centurion, Maria Aparecida Pessôa da Cruz, Ferreira, Marcelo da Costa, Alves, Pedro Luís da Costa Aguiar
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Bioscience journal (Online)
Texto Completo: https://seer.ufu.br/index.php/biosciencejournal/article/view/42323
Resumo: At maximum vegetative growth, sprays with fungicide to control Asian rust (Phakopsora pachyrhizi Sydow and P. Sydow) should reach high canopy penetration and plant coverage. Therefore, the central objective of this study was to determine leaf area, spray deposition, and plant coverage by fungicides sprayed on soybeans as a function of sowing seasons and plant population densities with reduced doses of tebuconazole and azoxystrobin + cyproconazole. Field experiments were conducted in the 2009/2010 and 2010/2011 crop years, using a medium-cycle soybean cultivar MG/BR–46 (Conquista) under a natural infestation of Asian soybean rust. Leaf area (LA) and leaf area index (LAI) were measured at three developmental stages (V8, R2, and R4). Spray deposition and coverage were evaluated during the first fungicide spraying. As results, LAI decreased as plant population decreased. Despite the lower LAIs, smaller plant populations had no effect on spray deposition and plant coverage. Both fungicides presented similar depositions on all thirds when plants had lower development.
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spelling Fungicide spray coverage and deposition in soybean asian rust managementCobertura e depósito de calda fungicida no manejo da ferrugem asiática em sojaChemical controlSowing seasonLeaf area indexPhakopsora pachyrhizi Sydow and P. SydowPlant populationAgricultural SciencesAt maximum vegetative growth, sprays with fungicide to control Asian rust (Phakopsora pachyrhizi Sydow and P. Sydow) should reach high canopy penetration and plant coverage. Therefore, the central objective of this study was to determine leaf area, spray deposition, and plant coverage by fungicides sprayed on soybeans as a function of sowing seasons and plant population densities with reduced doses of tebuconazole and azoxystrobin + cyproconazole. Field experiments were conducted in the 2009/2010 and 2010/2011 crop years, using a medium-cycle soybean cultivar MG/BR–46 (Conquista) under a natural infestation of Asian soybean rust. Leaf area (LA) and leaf area index (LAI) were measured at three developmental stages (V8, R2, and R4). Spray deposition and coverage were evaluated during the first fungicide spraying. As results, LAI decreased as plant population decreased. Despite the lower LAIs, smaller plant populations had no effect on spray deposition and plant coverage. Both fungicides presented similar depositions on all thirds when plants had lower development.Para o controle da ferrugem asiática (Phakopsora pachyrhizi Sydow & P. Sydow), quando as plantas atingem o máximo de desenvolvimento vegetativo, as pulverizações com fungicidas necessitam de alta capacidade de penetração e cobertura. O objetivo deste trabalho foi determinar a área foliar, o depósito e a cobertura de calda fungicida em soja em função de épocas de semeadura, populações de plantas e doses reduzidas de fungicidas. Experimentos de campo foram conduzidos nos anos agrícolas 2009/2010 e de 2010/2011, com a cultivar de ciclo médio MG/BR-46 (Conquista), sob infestação natural da ferrugem asiática. Nos estádios V8, R2 e R4 de desenvolvimento da cultura foram determinados a área foliar e o índice de área foliar (IAF) das plantas. As avaliações de depósito e cobertura foram realizadas no momento da primeira pulverização com os tratamentos fungicidas. Com a redução da população de plantas houve redução no IAF. Os depósitos e coberturas da calda aplicada não apresentaram aumento com a redução da população de plantas, apesar dos menores IAF. Os tratamentos fungicidas com tebuconazol e com azoxystrobina + ciproconazol apresentaram deposições semelhantes em todos os terços das plantas quando as plantas apresentaram menor desenvolvimento.EDUFU2019-10-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.ufu.br/index.php/biosciencejournal/article/view/4232310.14393/BJ-v35n5a2019-42323Bioscience Journal ; Vol. 35 No. 5 (2019): Sept./Oct.; 1422-1431Bioscience Journal ; v. 35 n. 5 (2019): Sept./Oct.; 1422-14311981-3163reponame:Bioscience journal (Online)instname:Universidade Federal de Uberlândia (UFU)instacron:UFUenghttps://seer.ufu.br/index.php/biosciencejournal/article/view/42323/27064Brazil; ContemporaryCopyright (c) 2019 Giselle Feliciani Barbosa, Maria Aparecida Pessôa da Cruz Centurion, Marcelo da Costa Ferreira, Pedro Luís da Costa Aguiar Alveshttps://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessBarbosa, Giselle FelicianiCenturion, Maria Aparecida Pessôa da CruzFerreira, Marcelo da CostaAlves, Pedro Luís da Costa Aguiar2022-01-26T02:48:17Zoai:ojs.www.seer.ufu.br:article/42323Revistahttps://seer.ufu.br/index.php/biosciencejournalPUBhttps://seer.ufu.br/index.php/biosciencejournal/oaibiosciencej@ufu.br||1981-31631516-3725opendoar:2022-01-26T02:48:17Bioscience journal (Online) - Universidade Federal de Uberlândia (UFU)false
dc.title.none.fl_str_mv Fungicide spray coverage and deposition in soybean asian rust management
Cobertura e depósito de calda fungicida no manejo da ferrugem asiática em soja
title Fungicide spray coverage and deposition in soybean asian rust management
spellingShingle Fungicide spray coverage and deposition in soybean asian rust management
Barbosa, Giselle Feliciani
Chemical control
Sowing season
Leaf area index
Phakopsora pachyrhizi Sydow and P. Sydow
Plant population
Agricultural Sciences
title_short Fungicide spray coverage and deposition in soybean asian rust management
title_full Fungicide spray coverage and deposition in soybean asian rust management
title_fullStr Fungicide spray coverage and deposition in soybean asian rust management
title_full_unstemmed Fungicide spray coverage and deposition in soybean asian rust management
title_sort Fungicide spray coverage and deposition in soybean asian rust management
author Barbosa, Giselle Feliciani
author_facet Barbosa, Giselle Feliciani
Centurion, Maria Aparecida Pessôa da Cruz
Ferreira, Marcelo da Costa
Alves, Pedro Luís da Costa Aguiar
author_role author
author2 Centurion, Maria Aparecida Pessôa da Cruz
Ferreira, Marcelo da Costa
Alves, Pedro Luís da Costa Aguiar
author2_role author
author
author
dc.contributor.author.fl_str_mv Barbosa, Giselle Feliciani
Centurion, Maria Aparecida Pessôa da Cruz
Ferreira, Marcelo da Costa
Alves, Pedro Luís da Costa Aguiar
dc.subject.por.fl_str_mv Chemical control
Sowing season
Leaf area index
Phakopsora pachyrhizi Sydow and P. Sydow
Plant population
Agricultural Sciences
topic Chemical control
Sowing season
Leaf area index
Phakopsora pachyrhizi Sydow and P. Sydow
Plant population
Agricultural Sciences
description At maximum vegetative growth, sprays with fungicide to control Asian rust (Phakopsora pachyrhizi Sydow and P. Sydow) should reach high canopy penetration and plant coverage. Therefore, the central objective of this study was to determine leaf area, spray deposition, and plant coverage by fungicides sprayed on soybeans as a function of sowing seasons and plant population densities with reduced doses of tebuconazole and azoxystrobin + cyproconazole. Field experiments were conducted in the 2009/2010 and 2010/2011 crop years, using a medium-cycle soybean cultivar MG/BR–46 (Conquista) under a natural infestation of Asian soybean rust. Leaf area (LA) and leaf area index (LAI) were measured at three developmental stages (V8, R2, and R4). Spray deposition and coverage were evaluated during the first fungicide spraying. As results, LAI decreased as plant population decreased. Despite the lower LAIs, smaller plant populations had no effect on spray deposition and plant coverage. Both fungicides presented similar depositions on all thirds when plants had lower development.
publishDate 2019
dc.date.none.fl_str_mv 2019-10-09
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.ufu.br/index.php/biosciencejournal/article/view/42323
10.14393/BJ-v35n5a2019-42323
url https://seer.ufu.br/index.php/biosciencejournal/article/view/42323
identifier_str_mv 10.14393/BJ-v35n5a2019-42323
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://seer.ufu.br/index.php/biosciencejournal/article/view/42323/27064
dc.rights.driver.fl_str_mv https://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.coverage.none.fl_str_mv Brazil; Contemporary
dc.publisher.none.fl_str_mv EDUFU
publisher.none.fl_str_mv EDUFU
dc.source.none.fl_str_mv Bioscience Journal ; Vol. 35 No. 5 (2019): Sept./Oct.; 1422-1431
Bioscience Journal ; v. 35 n. 5 (2019): Sept./Oct.; 1422-1431
1981-3163
reponame:Bioscience journal (Online)
instname:Universidade Federal de Uberlândia (UFU)
instacron:UFU
instname_str Universidade Federal de Uberlândia (UFU)
instacron_str UFU
institution UFU
reponame_str Bioscience journal (Online)
collection Bioscience journal (Online)
repository.name.fl_str_mv Bioscience journal (Online) - Universidade Federal de Uberlândia (UFU)
repository.mail.fl_str_mv biosciencej@ufu.br||
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