Eficácia versus viabilidade econômica do controle químico e genético da ferrugem da folha em trigo

Assunção, Marlon; Torres, Adalci Leite

doi:10.1590/s0103-84782013005000094

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…The application of fungicide in low yield environments and where diseaseunfavorable factors predominate combined with the use of resistant genotypes, may compromise the economic viability of this practice (Wegulo et al, 2011;Thompson et al, 2014). In a study with a cultivar that was little affected by leaf rust, Assunção & Torres (2013) also emphasize the need to adopt action thresholds, considering the economic return of this practice and the rational use of fungicides.…”

Section: Resultsmentioning

confidence: 99%

Environment-specific selection to identify high yielding wheat genotypes and response to fungicide application

Benin

Storck

Marchioro³

et al. 2017

Rev. Ceres

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RESUMOSubmetido em 06/11/15 e aprovado em 21/02/17. 1 Universidade Tecnológica Federal do Paraná, Pato Branco, Paraná, Brazil. giovani.bn@gmail.com; lindolfostorck@gmail.com; elesandro.bornhofen@gmail.com; leowoyann@gmail.com; diegotrevizan@alunos.utfpr.edu.br 2 Cooperativa Central de Pesquisa Agrícola (COODETEC), Cascavel, Paraná, Brazil. volmir@coodetec.com.br *Corresponding author: benin@utfpr.edu.br Environment-specific selection to identify high yielding wheat genotypes and response to fungicide application Selection of disease resistant genotypes is the main goal of wheat (Triticum aestivum L.) breeding programs. However, because of the lack of genotypes resistant to all diseases and the strong influence of the environment on the level of resistance of the genotypes, the use of fungicides is necessary in the cultivation of wheat. The objective of this study was to compare the gain in yield and the selection efficiency of wheat genotypes due to the fungicide application in trials carried out in different sites and years. This study used grain yield data from 816 wheat genotypes evaluated in 248 advanced trials at eight sites during the years from 2004 to 2012. The gain resulting from fungicide application for a given genotype was estimated by the difference between yield of plots on which fungicide was applied and control treatment. The greatest gains with fungicide application were observed in sites with lower average temperatures and higher rainfall indices, such as Campo Mourão, Castro, Não-Me-Toque and Guarapuava. On the other hand, the lowest gains with fungicide application occurred in Dourados and Palotina, environments where crops in general suffer water stress and present higher average temperatures. The year effect resulted in yield increases due to fungicide application ranging from 16.9 to 60.7%. The selection and evaluation of the response to the application of fungicide in wheat should be environment-specific to maximize the use of genotype x environment interaction. Seleção ambiente-específica de genótipos para rendimento de grãos e responsividade à aplicação de fungicida em trigo A seleção de genótipos resistentes a doenças é uma meta prioritária dos programas de melhoramento genético de trigo (Triticum aestivum L.). Mas, devido a não existirem genótipos resistentes à todas as doenças e a forte influência do ambiente no nível de resistência dos genótipos, o uso de fungicidas é necessário no cultivo do trigo. O objetivo deste estudo foi comparar o ganho em produtividade e a eficiência da seleção de genótipos de trigo devido à aplicação de fungicida em ensaios realizados em diferentes locais e anos de cultivo. Foram utilizados dados de produtividade de grãos de 816 genótipos de trigo avaliados em 248 ensaios de competição, em oito locais, nas safras agrícolas de 2004 a 2012. O ganho com a aplicação de fungicida para um dado genótipo foi estimado pela diferença entre a produtividade das parcelas que receberam fungicida e o tratamento controle. Os maiores ganhos com a aplicação de fung...

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Section: Resultsmentioning

confidence: 99%

Environment-specific selection to identify high yielding wheat genotypes and response to fungicide application

Benin

Storck

Marchioro³

et al. 2017

Rev. Ceres

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Effectiveness of different fungicide formulations and number of applications in controlling wheat leaf rust

Barro

Forte²,

Trentin³

et al. 2017

Summa phytopathol.

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Leaf rust (Puccinia triticina) is one of the most common diseases in wheat crops. For effective control of such disease, leaf application of mixtures of triazole and strobilurin fungicides is recommended. The aim of this study was to evaluate the efficacy of different fungicide formulations and numbers of applications in controlling wheat leaf rust in the cultivar TBIO Pioneiro 2010. Experimental design was completely randomized, 2x2 factorial arrangement, consisting of two fungicide formulations and two numbers of applications, as well as four replicates. Treatments were: azoxystrobin + tebuconazole, three and four applications; trifloxystrobin + prothioconazole, three and four applications; and a control treatment without fungicide application. For treatments with three applications, fungicides were applied at the phenological stages of: elongation, booting and flowering. ABSTRACTwith four applications, fungicides were applied at the phenological stages of: tillering, elongation, booting and flowering. The efficiency of fungicides on leaf rust control was analyzed based on the disease severity assessment by calculating the Area Under Disease Progress Curve (AUDPC). Severity data were obtained based on percentage scores of leaf area with visible disease symptoms/signs according to Cobb's diagrammatic scale. Fungicides with azoxystrobin + tebuconazole and trifloxystrobin + prothioconazole showed efficient control of wheat leaf rust (higher than 85%). For yield components, there was no statistical difference between numbers of applications, but there was a statistical difference between fungicide formulations, except for grain yield. Furthermore, for yield components, all fungicide treatments significantly differed from control. RESUMOA ferrugem da folha do trigo (Puccinia triticina) é uma das doenças mais frequentes em lavouras de trigo. Para um controle efetivo dessa doença é recomendado o controle foliar através da aplicação de misturas de fungicidas triazóis e estrobilurinas. O objetivo deste estudo foi avaliar a eficácia das diferentes formulações fungicidas e do número de aplicações para o controle da ferrugem da folha do trigo na cultivar TBIO Pioneiro 2010. O delineamento experimental utilizado foi inteiramente casualizado, fatorial 2x2, consistindo em duas formulações fungicidas e dois números de aplicações, com quatro repetições. Os tratamentos foram: azoxistrobina + tebuconazol com três e quatro aplicações; trifloxistrobina + protioconazol com três e quatro aplicações; e um tratamento testemunha sem aplicação de fungicida. Nos tratamentos com três aplicações, os fungicidas foram aplicados nos estádios fenológicos de: alongamento, emborrachamento e florescimento. Os tratamentos com Barro, J.P.; Forte, C.T.; Trentin, D.; Scariot, M.; Milanesi, P.M. Eficácia de diferentes formulações fungicidas e número de aplicações para o controle da ferrugem da folha no trigo. Summa Phytopathologica, v.43, n.4, p.276-280, 2017. quatro aplicações foram realizados nos estádios fenológicos de: perfilhamento, alongamen...

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Eficácia versus viabilidade econômica do controle químico e genético da ferrugem da folha em trigo

Cited by 2 publications

References 7 publications

Environment-specific selection to identify high yielding wheat genotypes and response to fungicide application

Environment-specific selection to identify high yielding wheat genotypes and response to fungicide application

Effectiveness of different fungicide formulations and number of applications in controlling wheat leaf rust

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