Spectrum spray droplets and control of diseases in two wheat cultivars/ Espectro de gotas de pulverizacao e controle de doencas em duas cultivares de trigo

The objective of this study was to determine the influence of the number of drops in the penetration of fungicides and their effectiveness in control at different times of application. The experimental design was randomized blocks in split split plots, totalizing 20 treatments in four replications,...

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Bibliographic Details
Published in:Ciência rural 2013-10, Vol.43 (10), p.1747
Main Authors: Gulart, Caroline Almeida, Debortoli, Monica, Madalosso, Marcelo, Balardin, Ricardo, dos Santos, Paulo Sergio, Corte, Gerson Dalla, Lenz, Giuvan, Marques, Leandro Nascimento
Format: Article
Language:Spanish
Subjects:
Fungicides
Wheat
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Summary:The objective of this study was to determine the influence of the number of drops in the penetration of fungicides and their effectiveness in control at different times of application. The experimental design was randomized blocks in split split plots, totalizing 20 treatments in four replications, consisting of two wheat cultivars ('Fundacep Cristalino' and 'Fundacep Nova Era'); three spray nozzles (XR 11002, TJ 60-11002 and TX8002), and control with and without fungicide. Was evaluated the density of droplets per square centimeter, volume median diameter (VMD), severity of disease, test weight and yield. The spectrum of droplets generated by the spray tip XR 11002 under the conditions of this study show the best results in terms of droplet deposition, disease control and yield in both wheat cultivars. The control of leaf spot and leaf rust of wheat provides protection of crop yield potential, varying depending on the susceptibility of cultivars and fungicides coverage and penetration. Key words: Application technology, penetration drops, leaf spots, Puccinia graminis tritici, Triticum aestivum, disease control. O objetivo do trabalho foi determinar a influencia do numero de gotas na penetracao dos fungicidas e na sua eficacia de controle em diferentes momentos de aplicacao. O delineamento experimental utilizado foi de Blocos ao acaso em parcelas subsubdivididas em quatro repeticoes. Os tratamentos foram constituidos por duas cultivares de trigo, 'Fundacep Cristalino'e 'Fundacep Nova Era'; tres pontas de pulverizacao: XR 11002, TJ 60 11002 e TX 8002 e o tratamento controle com e sem fungicida. Foi avaliada a densidade de gotas por centimetro quadrado, diametro mediano volumetrico (DMV), severidade das doencas, peso hectolitro e produtividade da cultura. O espectro de gotas gerado pela ponta de pulverizacao XR 11002, nas condicoes do presente trabalho, apresentaram os melhores resultados em termos de deposicao de gotas, controle das doencas e produtividade nas duas cultivares de trigo. O controle das manchas foliares e ferrugem--da--folha do trigo proporciona protecao do potencial produtivo da cultura, variando em funcao da suscetibilidade de cultivares e da cobertura e penetracao de fungicidas. Palavras-chave: Tecnologia de aplicacao, penetracao de gotas, manchas foliares, Puccinia graminis tritici, Triticum aestivum, controle de doencas.
ISSN:0103-8478