Curative and protective action of organic and inorganic compounds in the control of Microsphaera diffusa in soybean

Authors

  • Emanueli Bizarro Furtado Universidade Federal de Pelotas, Pelotas, RS, Brasil.
  • Keilor da Rosa Dorneles Universidade Federal de Pelotas, Pelotas, RS, Brasil.
  • Leandro José Dallagnol Universidade Federal de Pelotas, Pelotas, RS, Brasil.

DOI:

https://doi.org/10.5965/223811711912020104

Keywords:

Glycine max L., powdery mildew, chemical control, resistance inductors

Abstract

The objective of this work was to assess the effect of acibenzolar-s-methyl, potassium phosphite, potassium silicate, and trifloxystrobin + prothioconazole products on curative control of powdery mildew (Microsphaera diffusa) in soybean. The experimental design was completely randomized, in a single factor scheme, containing five treatments with four replications. The products were applied on leaves at the V4 phenological stage, with disease severity of 5%. At 7, 14, and 21 days after the application of the products (DAA), the incidence and severity of the disease were assessed. The trifloxystrobin + prothioconazole reduced by 30% the disease incidence and 80% disease severity compared to the control. The inhibitory effect of the products on conidia production in vivo and its germination in vitro were also assessed. Trifloxystrobin + prothioconazole was more effective in the reduction of both conidia production and germination. Acibenzolar-s-methyl, potassium phosphite, and potassium silicate reduced conidia germination, but neither affected the disease severity nor the conidia production. Based on this, it can be concluded that the fungicide trifloxystrobin + prothioconazole reduced the production of conidia and inhibited its germination, showing curative and protective effect against soybean powdery mildew and that the resistance inducers tested interfered with pathogen germination, but without significant effect on the disease when applied after the onset of symptoms.

Downloads

Download data is not yet available.

References

BLUM LEB et al. 2002. Fungicidas e mistura de fungicidas no controle do oídio da soja. Fitopatologia Brasileira 27: 216-218.

BRASIL SOS et al. 2018. Importância da resistência de plantas no controle de oídio: um levantamento de cultivares de soja no Brasil. Revista Científica Rural 20: 188-202.

BRUZAMARELLO J et al. 2018. Potencial de fosfitos na indução da resistência em plantas de soja. Cultura Agronômica 27: 263-273.

CONAB. 2019. Companhia Nacional do Abastecimento. Acompanhamento da Safra Brasileira. Brasília: Conab. 15p.

DALLAGNOL LJ et al. 2006. Use of Acibenzolar-S-Methyl to control foliar diseases of soybean. Summa Phytopathologica 32: 255-259.

FEHR WR & CAVINESS CE. 1977. Stages of soybean development. State University of Science and Technology 80: 1-12.

MATTIAZZI P. 2003. Efeito do oídio (Microsphaera diffusa Cooke & Peck) na produção e duração da área foliar sadia da soja. Tese (Doutorado em Fitotecnia). Piracicaba: ESALQ. 49p.

GORLACH J et al. 1996. Benzothiadiazole, a novel class of inducers of systemic acquired resistance, activates gene expression and disease resistance in wheat. The Plant Cell 8: 629-643.

OLIVEIRA GM et al. 2015. Fosfito e silicato de potássio no controle da ferrugem asiática da soja (Phakopsora pachyrhizi Syd. & P. Syd). Revista Brasileira de Ciências Agrárias 10: 60-65.

SALVADORI JR et al. 2016. Indicações técnicas para a cultura da soja no Rio Grande do Sul e em Santa Catarina, safras 2016/2017 e 2017/2018. Passo Fundo: UPF. 128p.

SILVA OC et al. 2013. Fontes de fosfito e acibenzolar-S-metílico associados a fungicidas para o controle de doenças foliares na cultura da soja. Tropical Plant Pathology 38: 72-77.

TOIGO S et al. 2008. Controle químico do oídio na cultura da soja. Scientia Agraria 9: 491-496.

YULIA E et al. 2017. Resistance Potential to Powdery Mildew (Microsphaera diffusa Cooke and Peck) of Several Yellow and Black Soybean (Glycine max (L.) Merr) Genotypes. KnE Life Sciences 2: 270-278.

Published

2020-04-03

How to Cite

FURTADO, Emanueli Bizarro; DORNELES, Keilor da Rosa; DALLAGNOL, Leandro José. Curative and protective action of organic and inorganic compounds in the control of Microsphaera diffusa in soybean. Revista de Ciências Agroveterinárias, Lages, v. 19, n. 1, p. 104–108, 2020. DOI: 10.5965/223811711912020104. Disponível em: https://www.revistas.udesc.br/index.php/agroveterinaria/article/view/15466. Acesso em: 2 dec. 2024.

Issue

Section

Research Note - Science of Plants and Derived Products

Most read articles by the same author(s)