Effect of adding fungicide to mixtures of triazoles and strobilurins in the control of downy mildew and Asian soybean rust

Authors

  • Bruno Zuntini Desenvolvimento Técnico de Mercado – Sudoeste Goiano. Marketing DTM. Syngenta - Proteção de Cultivares.
  • Rita de Cassia Félix Alvarez Universidade Federal de Mato Grosso do Sul - Câmpus de Chapadão do Sul - MS.
  • Gustavo de Faria Theodoro Universidade Federal de Mato Grosso do Sul - Departamento de Medicina Veterinária e Zootecnia, Cidade Universitária, Campo Grande - MS
  • Alan Mario Zuffo Universidade Federal de Mato Grosso do Sul - Câmpus de Chapadão do Sul - MS.

Abstract

Fungicides used to control the Asian soybean rust are composed almost entirely of mixtures involving the systemic (triazoles) and meso-systemic (strobilurins) modes of action. However, to control the soybean downy mildew, only protective fungicides are available. The present study aimed to evaluate the effectiveness of fungicides with different modes of action in the control of downy mildew and Asian soybean rust. A field experiment was carried out in a randomized block design, with seven treatments [negative control; difenoconazole at V7 + (azoxystrobin + cyproconazole) at R2 and R5.1; (tebuconazole + carbendazim) at V7 + (azoxystrobin + tebuconazole) at R2 and R5.1; carbendazim and mancozeb at V7 + (azoxystrobin + tebuconazole) at R2 and R5.1; (tebuconazole + carbendazim) at V7 + mancozeb in V7 + (azoxystrobin + tebuconazole) at R2 and R5.1; (tebuconazole + carbendazim) at V7 + (azoxystrobin + tebuconazole) at R2 and R5.1 + mancozeb at R2 and R5.1; (tebuconazole + carbendazim) at V7 + azoxystrobin + tebuconazole at R2 and R5.1 + mancozeb at R2 and R5.1 + carbendazim at R5.1] and four replicates. The following variables were evaluated: disease severity based on diagrammatic scales, phytotoxicity, product effectiveness, defoliation, number of pods per plant, number of seeds per pod, 1,000-seed weight and yield. The treatments with mancozeb addition showed to be more efficient in reducing the severity of mildew and Asian soybean rust and defoliation, providing increased seed yields for the crop. For the soybean downy mildew, the treatments with addition of mancozeb to benzimidazole, strobilurins and triazoles were more efficient in reducing the severity and for the control.

KEYWORDS: Glycine max, Phakopsora pachyrhizi, Peronospora manshurica.

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Author Biographies

Bruno Zuntini, Desenvolvimento Técnico de Mercado – Sudoeste Goiano. Marketing DTM. Syngenta - Proteção de Cultivares.

Mestre em Agronomia: área de concentração produção vegetal, pela UFMS, Câmpus de Chapadão do Sul - MS.

Rita de Cassia Félix Alvarez, Universidade Federal de Mato Grosso do Sul - Câmpus de Chapadão do Sul - MS.

Área de atuação produção vegetal/grandes culturas. 

Mestrado UNESP/FCA, Botucatu - SP, Departamento de Agricultura - Área de Concentração: Agricultura/Produção Vegetal.

Doutorado UNESP/FCA, Botucatu - SP, Departamento de Agricultura - Área de Concentração: Agricultura/Produção Vegetal.

Pós-doutorado UNESP/Jaboticabal - SP, Departamento de Solos e adubação/Nutrição de Plantas

 

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Published

2019-04-25

How to Cite

ZUNTINI, B.; ALVAREZ, R. de C. F.; DE FARIA THEODORO, G.; MARIO ZUFFO, A. Effect of adding fungicide to mixtures of triazoles and strobilurins in the control of downy mildew and Asian soybean rust. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 49, p. e53688, 2019. Disponível em: https://revistas.ufg.br/pat/article/view/53688. Acesso em: 17 jul. 2024.

Issue

Vol. 49 (2019)

Section

Research Article

License

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