African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6691

Full Length Research Paper

The use of plant extracts in anthracnose control in species of Helconia (Heliconia psittacorum cv. Golden Torch and Heliconia rostrata)

Joicilene Rodrigues Gusmao
  • Joicilene Rodrigues Gusmao
  • Post-Graduation Program of Agroecology, State University of Maranhão, São Luís, Maranhão State, Brazil.
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Antonia Alice Costa Rodrigues
  • Antonia Alice Costa Rodrigues
  • Post-Graduation Program of Agroecology, State University of Maranhão, São Luís, Maranhão State, Brazil.
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Luiz Gustavo de Lima Melo
  • Luiz Gustavo de Lima Melo
  • Post-Graduation Program of Agroecology, State University of Maranhão, São Luís, Maranhão State, Brazil.
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Erlen Keila Candido e Silva
  • Erlen Keila Candido e Silva
  • Post-Graduation Program of Agroecology, State University of Maranhão, São Luís, Maranhão State, Brazil.
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Anna Christina Sanazario de Oliveira
  • Anna Christina Sanazario de Oliveira
  • Post-Graduation Program of Agroecology, State University of Maranhão, São Luís, Maranhão State, Brazil.
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Anna Christina Sanazário de Oliveira
  • Anna Christina Sanazário de Oliveira
  • Post-Graduation Program of Agroecology, State University of Maranhão, São Luís, Maranhão State, Brazil.
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Diogo Herison Silva Sardinha
  • Diogo Herison Silva Sardinha
  • Post-Graduation Program of Agroecology, State University of Maranhão, São Luís, Maranhão State, Brazil.
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Heder Braun
  • Heder Braun
  • Post-Graduation Program of Agroecology, State University of Maranhão, São Luís, Maranhão State, Brazil.
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  •  Received: 10 July 2018
  •  Accepted: 30 October 2018
  •  Published: 29 November 2018

Abstract

The objective of the present study was to assess the anti-fungal activity of medicinal plant extracts on inhibition of Colletotrichum gloesporioides mycelial growth, sporulation and germination and on anthracnose control in Heliconia psitacorum cv. Golden Torch and Heliconia rostrata. Extracts of garlic, lemon grass, cinnamon, lemon balm, eucalyptus, ginger, mint, bitter melon and black pepper were used. The, mycelial were assessed in vitro by measuring their growth in Petri dishes. Sporulation was assessed by counting spores in a Neubauer chamber. Germination was observed based on germination tube emission. In the in vitro tests, the inflorescences were treated with the plant extracts and inoculated with the pathogen 24 h later. The results showed that all the extracts presented anti-fungal activity, in greater or lesser intensity, compared to the control. The garlic extract resulted in the highest mycelial growth inhibition rate. Regarding sporulation, the bitter melon, ginger, mint, popcorn eucalyptus and bitter melon extracts were more efficacious, interfering in spore formation; while the ginger extract most reduced spore germination inhibiting germination tube emission. For the in vivo tests, it was observed that all the plant extracts tested were efficient in reducing lesion severity in the inflorescence, showing that the use of plant extracts may be a promising alternative for managing the diseases that affect helconia post-harvest.

Key words: Alternative control, fungi, Colletotrichum gloesporioides, tropical flowers.