Rhizoctonia solani AG-1 IA infects both rice and signalgrass in the Colombian Llanos

Authors

  • Lina Maria Ramos-Molina UNESP Campus de Jaboticabal
  • Edisson Chavarro-Mesa UNESP Campus de Jaboticabal
  • Danilo Augusto dos Santos Pereira ETH Zurich - Swiss Federal Institute of Technology
  • María del Rosario Silva-Herrera Universidad de Los Llanos
  • Paulo Cezar Ceresini UNESP Campus de Ilha Solteira

Keywords:

Urochloa spp., Rhizoctonia oryzae-sativae, Sclerotium hydrophilum.

Abstract

Foliar blight and death of signalgrass (Urochloa spp.) pastures are caused by the Rhizoctonia solani fungus. This study aimed at determining which pathogens from the Rhizoctonia species complex are associated with leaf and sheath blight in Urochloa and rice, in the Colombian Llanos. Sympatric areas of Urochloa pastures adjacent to rice cropping areas were sampled using a linear transect system. The pathogens were identified using morphological traits, molecular detection based on specific primers and sequencing of the ITS-5.8S rDNA region. R. solani AG-1 IA predominated as the pathogen associated with foliar blight in all samples from U. brizantha cv. ‘Toledo’ and hybrid Urochloa cv. ‘Mulato’. Besides R. solani AG-1 IA (18 % of the samples), Rhizoctonia oryzae-sativae (71 %) and Sclerotium hydrophilum (11 %) were also detected. In the cross-pathogenicity test, the R. solani AG-1 IA fungus was the most aggressive to Urochloa, while R. oryzae-sativae produced very mild infection symptoms. This is the first report of R. oryzae-sativae and S. hydrophilum associated with the complex of rice sheath blight diseases in Colombia.

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Author Biographies

Lina Maria Ramos-Molina, UNESP Campus de Jaboticabal

Programa de Pós-Graduação em Agronomia, Genética e Melhoramento de Plantas.

Edisson Chavarro-Mesa, UNESP Campus de Jaboticabal

Programa de Pós-Graduação em Agronomia, Genética e Melhoramento de Plantas.

Danilo Augusto dos Santos Pereira, ETH Zurich - Swiss Federal Institute of Technology

Programa de pós-graduação em Ciências / Graduate program in Science,  ETH Zurich - Institute of Integrative Biology - Plant Pathology

María del Rosario Silva-Herrera, Universidad de Los Llanos

Agronomía, Fitopatología

Paulo Cezar Ceresini, UNESP Campus de Ilha Solteira

Departamento de Fitossanidade, Engenharia Rural e Solos, área de Fitopatologia

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Published

2016-04-12

How to Cite

RAMOS-MOLINA, L. M.; CHAVARRO-MESA, E.; PEREIRA, D. A. dos S.; SILVA-HERRERA, M. del R.; CERESINI, P. C. Rhizoctonia solani AG-1 IA infects both rice and signalgrass in the Colombian Llanos. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 46, n. 1, p. 65–71, 2016. Disponível em: https://revistas.ufg.br/pat/article/view/38696. Acesso em: 22 dec. 2024.

Issue

v. 46, n. 1, Jan./Mar. 2016

Section

Research Article

License

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