Implicações da desfolha precoce e da proteção química à mancha branca na cultura do milho
Autor(a) principal: | |
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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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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 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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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 |
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reponame:Repositório Institucional da UFU instname:Universidade Federal de Uberlândia (UFU) instacron:UFU |
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Universidade Federal de Uberlândia (UFU) |
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Repositório Institucional da UFU |
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Repositório Institucional da UFU |
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Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU) |
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diinf@dirbi.ufu.br |
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