Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milho

Detalhes bibliográficos
Autor(a) principal: Rezende, Wender Santos
Data de Publicação: 2014
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Repositório Institucional da UFU
Texto Completo: https://repositorio.ufu.br/handle/123456789/12206
https://doi.org/10.14393/ufu.di.2014.289
Resumo: Maize is one of the main crops in Brazil and the world, and its production is highly demanded for human and animal consumption. Maintenance of leaf integrity is required by the crop to reach high yield. Therefore, this study evaluated the effect of defoliation at the beginning of the crop cycle and the combination of fungicides to control white spot disease in maize. This study was divided into two trials. The first one evaluated the effect of defoliation in vegetative stage V4 on maize development and yield. Six experiments were conducted in different years and locations, representing different environments, besides different investment levels. The experimental design was randomized complete block with four defoliation levels (treatments), and seven replicates. Defoliation was performed manually in maize vegetative stage V4, with treatments consisting of removal of the two basal leaves, removal of four fully expanded leaves, plant section (removal of all leaves), besides a control. Duration of vegetation period and, previously to harvest, plant height, main ear insertion height, breaking strength of stalk, force required to pull the plant and kernel productivity were evaluated. It can be concluded that removal of four leaves and the section of the plant in V4 stage hinders plant growth, delays flowering and greatly reduces yield. The second study evaluated combination of fungicides to control maize white spot and maize response to chemical protection in field conditions. Four experiments were done in different years and locations. The experimental design was randomized blocks with seven treatments and six replications. The treatments were: dithiocarbamate with two or three applications, strobilurin + triazole with two or three applications, strobilurin + triazole + dithiocarbamate with two or three applications and a control treatment (without fungicide). White spot severity of maize was evaluated for the calculation of AUDPC, percentage of green leaf area at the end of the crop cycle, stem integrity (stalk density, stalk breaking strength, breaking height and angle), percentage of rotten kernels and kernel yield. It can be concluded that the combination of dithiocarbamate and the pre-mix of strobilurin and triazole, with two or three applications, was effective to control the maize white spot. The use of three applications of dithiocarbamate is also effective in controlling this disease. The effective treatments to control maize white spot also provided greater green leaf area, greater stalk integrity and yield. The maintenance of leaf area is important throughout the crop cycle for the expression of its yield potential, and the use of fungicides contributes for this maintenance.
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spelling Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milhoImplications of early defoliaton and chemical protection to maize white spot in maizeÁrea foliarIntegridade foliarDoença foliarFungicidaZea mays L.Análise foliarLeaf areaLeaf integrityLeaf diseaseFungicideCNPQ::CIENCIAS AGRARIAS::AGRONOMIAMaize is one of the main crops in Brazil and the world, and its production is highly demanded for human and animal consumption. Maintenance of leaf integrity is required by the crop to reach high yield. Therefore, this study evaluated the effect of defoliation at the beginning of the crop cycle and the combination of fungicides to control white spot disease in maize. This study was divided into two trials. The first one evaluated the effect of defoliation in vegetative stage V4 on maize development and yield. Six experiments were conducted in different years and locations, representing different environments, besides different investment levels. The experimental design was randomized complete block with four defoliation levels (treatments), and seven replicates. Defoliation was performed manually in maize vegetative stage V4, with treatments consisting of removal of the two basal leaves, removal of four fully expanded leaves, plant section (removal of all leaves), besides a control. Duration of vegetation period and, previously to harvest, plant height, main ear insertion height, breaking strength of stalk, force required to pull the plant and kernel productivity were evaluated. It can be concluded that removal of four leaves and the section of the plant in V4 stage hinders plant growth, delays flowering and greatly reduces yield. The second study evaluated combination of fungicides to control maize white spot and maize response to chemical protection in field conditions. Four experiments were done in different years and locations. The experimental design was randomized blocks with seven treatments and six replications. The treatments were: dithiocarbamate with two or three applications, strobilurin + triazole with two or three applications, strobilurin + triazole + dithiocarbamate with two or three applications and a control treatment (without fungicide). White spot severity of maize was evaluated for the calculation of AUDPC, percentage of green leaf area at the end of the crop cycle, stem integrity (stalk density, stalk breaking strength, breaking height and angle), percentage of rotten kernels and kernel yield. It can be concluded that the combination of dithiocarbamate and the pre-mix of strobilurin and triazole, with two or three applications, was effective to control the maize white spot. The use of three applications of dithiocarbamate is also effective in controlling this disease. The effective treatments to control maize white spot also provided greater green leaf area, greater stalk integrity and yield. The maintenance of leaf area is important throughout the crop cycle for the expression of its yield potential, and the use of fungicides contributes for this maintenance.Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorMestre em AgronomiaA cultura do milho é uma das principais culturas agrícolas do Brasil e do mundo, e sua produção é altamente demandada para alimentação humana e animal. Para que a cultura atinja altas produtividades, é necessária a manutenção da integridade foliar. Visto isso, o objetivo deste trabalho foi avaliar a influência da desfolha no início do ciclo da cultura do milho e a combinação de fungicidas para o controle da doença mancha branca do milho. Este trabalho foi dividido em duas pesquisas. A primeira pesquisa avaliou a influência da desfolha no estádio vegetativo V4 sobre o desenvolvimento e rendimento da cultura do milho. Para tanto, seis experimentos foram conduzidos em diferentes anos e locais, representando diferentes ambientes, além de diferentes níveis de investimento. O delineamento experimental foi em blocos casualizados, com quatro tratamentos, compostos por níveis de desfolha, e sete repetições. A desfolha foi realizada manualmente no estádio vegetativo V4 do milho, sendo os tratamentos compostos por retirada das duas folhas basais, retirada das quatro folhas completamente expandidas, secção da planta (remoção de todas as folhas), além de uma testemunha. Avaliaram-se a duração do período vegetativo e, em pré-colheita, altura de planta, altura de inserção da espiga principal, força de quebramento de colmo, força de arranquio da planta e produtividade de grãos. Concluiu-se que a retirada de quatro folhas e a secção da planta no estádio V4 prejudicam o crescimento da planta, atrasa o florescimento e reduz consideravelmente a produtividade da cultura. A segunda pesquisa avaliou combinações de fungicidas no controle da mancha branca e a resposta da cultura à proteção química em condições de campo. Para tanto, foram conduzidos quatro experimentos em diferentes anos e locais. O delineamento experimental foi em blocos casualizados, com sete tratamentos e seis repetições. Os tratamentos foram: ditiocarbamato com duas e três aplicações, estrobilurina + triazol com duas e três aplicações, ditiocarbamato + estrobilurina + triazol com duas e três aplicações e um tratamento testemunha (sem aplicação de fungicida). Avaliaram-se a severidade da mancha branca para o cálculo da AACPD, porcentagem de área foliar verde ao final do ciclo da cultura, integridade de colmo (densidade de colmo, força de quebramento do colmo, altura de quebramento e ângulo de quebramento), porcentagem de grãos ardidos e produtividade de grãos. Concluiu-se que a combinação de diotiocarbamato mais a mistura pronta de estrobilurina e triazol, com duas ou três aplicações, é eficaz para o controle da mancha branca. O uso de três aplicações de diotiocarbamato também é eficaz no controle dessa doença. Os tratamentos eficazes no controle da mancha branca também proporcionam maior área foliar verde no final do ciclo da cultura, maior integridade de colmo e produtividade. A manutenção da área foliar é importante durante todo o ciclo da cultura para a expressão do seu potencial produtivo, e o uso de fungicidas contribui para essa manutenção.Universidade Federal de UberlândiaBRPrograma de Pós-graduação em AgronomiaCiências AgráriasUFUBrito, Césio Humberto dehttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4797259Z7Ferreira, Adão de Siqueirahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798974T8Santos, Maria Amelia doshttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4785371A3Werlang, Ricardo Camarahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4705362E1Rezende, Wender Santos2016-06-22T18:31:06Z2014-12-102016-06-22T18:31:06Z2014-04-26info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfapplication/pdfREZENDE, Wender Santos. Implications of early defoliaton and chemical protection to maize white spot in maize. 2014. 46 f. Dissertação (Mestrado em Ciências Agrárias) - Universidade Federal de Uberlândia, Uberlândia, 2014. DOI https://doi.org/10.14393/ufu.di.2014.289https://repositorio.ufu.br/handle/123456789/12206https://doi.org/10.14393/ufu.di.2014.289porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFUinstname:Universidade Federal de Uberlândia (UFU)instacron:UFU2021-08-05T17:15:32Zoai:repositorio.ufu.br:123456789/12206Repositório InstitucionalONGhttp://repositorio.ufu.br/oai/requestdiinf@dirbi.ufu.bropendoar:2021-08-05T17:15:32Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU)false
dc.title.none.fl_str_mv Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milho
Implications of early defoliaton and chemical protection to maize white spot in maize
title Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milho
spellingShingle Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milho
Rezende, Wender Santos
Área foliar
Integridade foliar
Doença foliar
Fungicida
Zea mays L.
Análise foliar
Leaf area
Leaf integrity
Leaf disease
Fungicide
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
title_short Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milho
title_full Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milho
title_fullStr Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milho
title_full_unstemmed Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milho
title_sort Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milho
author Rezende, Wender Santos
author_facet Rezende, Wender Santos
author_role author
dc.contributor.none.fl_str_mv Brito, Césio Humberto de
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4797259Z7
Ferreira, Adão de Siqueira
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798974T8
Santos, Maria Amelia dos
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4785371A3
Werlang, Ricardo Camara
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4705362E1
dc.contributor.author.fl_str_mv Rezende, Wender Santos
dc.subject.por.fl_str_mv Área foliar
Integridade foliar
Doença foliar
Fungicida
Zea mays L.
Análise foliar
Leaf area
Leaf integrity
Leaf disease
Fungicide
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
topic Área foliar
Integridade foliar
Doença foliar
Fungicida
Zea mays L.
Análise foliar
Leaf area
Leaf integrity
Leaf disease
Fungicide
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
description Maize is one of the main crops in Brazil and the world, and its production is highly demanded for human and animal consumption. Maintenance of leaf integrity is required by the crop to reach high yield. Therefore, this study evaluated the effect of defoliation at the beginning of the crop cycle and the combination of fungicides to control white spot disease in maize. This study was divided into two trials. The first one evaluated the effect of defoliation in vegetative stage V4 on maize development and yield. Six experiments were conducted in different years and locations, representing different environments, besides different investment levels. The experimental design was randomized complete block with four defoliation levels (treatments), and seven replicates. Defoliation was performed manually in maize vegetative stage V4, with treatments consisting of removal of the two basal leaves, removal of four fully expanded leaves, plant section (removal of all leaves), besides a control. Duration of vegetation period and, previously to harvest, plant height, main ear insertion height, breaking strength of stalk, force required to pull the plant and kernel productivity were evaluated. It can be concluded that removal of four leaves and the section of the plant in V4 stage hinders plant growth, delays flowering and greatly reduces yield. The second study evaluated combination of fungicides to control maize white spot and maize response to chemical protection in field conditions. Four experiments were done in different years and locations. The experimental design was randomized blocks with seven treatments and six replications. The treatments were: dithiocarbamate with two or three applications, strobilurin + triazole with two or three applications, strobilurin + triazole + dithiocarbamate with two or three applications and a control treatment (without fungicide). White spot severity of maize was evaluated for the calculation of AUDPC, percentage of green leaf area at the end of the crop cycle, stem integrity (stalk density, stalk breaking strength, breaking height and angle), percentage of rotten kernels and kernel yield. It can be concluded that the combination of dithiocarbamate and the pre-mix of strobilurin and triazole, with two or three applications, was effective to control the maize white spot. The use of three applications of dithiocarbamate is also effective in controlling this disease. The effective treatments to control maize white spot also provided greater green leaf area, greater stalk integrity and yield. The maintenance of leaf area is important throughout the crop cycle for the expression of its yield potential, and the use of fungicides contributes for this maintenance.
publishDate 2014
dc.date.none.fl_str_mv 2014-12-10
2014-04-26
2016-06-22T18:31:06Z
2016-06-22T18:31:06Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv REZENDE, Wender Santos. Implications of early defoliaton and chemical protection to maize white spot in maize. 2014. 46 f. Dissertação (Mestrado em Ciências Agrárias) - Universidade Federal de Uberlândia, Uberlândia, 2014. DOI https://doi.org/10.14393/ufu.di.2014.289
https://repositorio.ufu.br/handle/123456789/12206
https://doi.org/10.14393/ufu.di.2014.289
identifier_str_mv REZENDE, Wender Santos. Implications of early defoliaton and chemical protection to maize white spot in maize. 2014. 46 f. Dissertação (Mestrado em Ciências Agrárias) - Universidade Federal de Uberlândia, Uberlândia, 2014. DOI https://doi.org/10.14393/ufu.di.2014.289
url https://repositorio.ufu.br/handle/123456789/12206
https://doi.org/10.14393/ufu.di.2014.289
dc.language.iso.fl_str_mv por
language por
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universidade Federal de Uberlândia
BR
Programa de Pós-graduação em Agronomia
Ciências Agrárias
UFU
publisher.none.fl_str_mv Universidade Federal de Uberlândia
BR
Programa de Pós-graduação em Agronomia
Ciências Agrárias
UFU
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFU
instname:Universidade Federal de Uberlândia (UFU)
instacron:UFU
instname_str Universidade Federal de Uberlândia (UFU)
instacron_str UFU
institution UFU
reponame_str Repositório Institucional da UFU
collection Repositório Institucional da UFU
repository.name.fl_str_mv Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU)
repository.mail.fl_str_mv diinf@dirbi.ufu.br
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