Tropical Plant Pathology

, Volume 43, Issue 2, pp 152–159 | Cite as

Rhizoctonia solani AG 1-IB and AG 4 HG-I causing leaf blight and root rot in plants from the Lamiaceae family in Brazil

  • Maruzanete P. de Melo
  • Cléia S. Cabral
  • Ailton Reis
  • Kedma S. Matos
  • Pâmela P. Martins
  • José E. A. Beserra Júnior
  • Kátia L. Nechet
  • Bernardo A. Halfeld-Vieira
Short Communication


Rhizoctonia solani is a fungal complex represented by 14 anastomosis groups. Each group has distinct characteristics that are reflected in the management and control strategies for diseases caused by this fungus. In three distinct geographical regions, plants of the Lamiaceae family from vegetable and medicinal herb gardens were observed, with Mentha piperina, Mentha spicata and Origanum manjerona presenting symptoms of leaf blight and Ocimum basilicum, Ocimum vulgare and Rosmarinus officinalis presenting root rot symptoms. Mycelia, hymenia, basidiospores and microsclerotia were found on the stems and leaves of Mentha piperina and Mentha spicata. These are typical morphological markers of the genus Rhizoctonia. The ITS region was amplified for nine isolates and subsequently sequenced. In the phylogenetic analysis, the isolates were identified as Rhizoctonia solani belonging to AG 1-IB and AG 4 HG-I anastomosis groups. All isolates inoculated in their respective hosts caused disease symptoms resembling those typically observed in the field. This is the first report of R. solani AG 1-IB in M. spicata, M. piperina and Origanum majorana and of R. solani AG 4 HG-I in O. vulgare, R. officinalis and O. basilicum in Brazil.


Basidiomycetes Root rot Medicinal plants Leaf blight Anastomosis group 



The authors are grateful to Capes (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for fellowships to Maruzanete Pereira de Melo, Kedma da Silva Matos, and Pâmela Ponce Martins.


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Copyright information

© Sociedade Brasileira de Fitopatologia 2017

Authors and Affiliations

  • Maruzanete P. de Melo
    • 1
  • Cléia S. Cabral
    • 2
  • Ailton Reis
    • 3
  • Kedma S. Matos
    • 4
  • Pâmela P. Martins
    • 1
  • José E. A. Beserra Júnior
    • 1
  • Kátia L. Nechet
    • 5
  • Bernardo A. Halfeld-Vieira
    • 5
  1. 1.Centro de Ciências Agrárias, Departamento de Fitotecnia, IningáUniversidade Federal do PiauíTeresinaBrazil
  2. 2.Departamento de FitopatologiaUniversidade de BrasíliaBrasíliaBrazil
  3. 3.Embrapa HortaliçasBrasíliaBrazil
  4. 4.Centro de Ciências AgráriasUniversidade Federal de Roraima-UFRRBoa VistaBrazil
  5. 5.Embrapa Meio AmbienteJaguariúnaBrazil

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