African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Alternative control of Corynespora cassiicola in papaya seedlings and fruits by Cinnamomum zeylanicum essential oil

Pedro Ivo Menezes Bitu
  • Pedro Ivo Menezes Bitu
  • State University of Maranhão, Post-Graduation Program of Agroecology, Maranhão State, Brazil.
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Leandro Victor Silva dos Santos
  • Leandro Victor Silva dos Santos
  • State University of Maranhão, Post-Graduation Program of Agroecology, Maranhão State, Brazil.
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Antonia Alice Costa Rodrigues
  • Antonia Alice Costa Rodrigues
  • State University of Maranhão, Post-Graduation Program of Agroecology, Maranhão State, Brazil.
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Heder Braun
  • Heder Braun
  • State University of Maranhão, Post-Graduation Program of Agroecology, Maranhão State, Brazil.
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Odair dos Santos Monteiro
  • Odair dos Santos Monteiro
  • Federal University of Maranhão, São Luís, Maranhão State, Brazil.
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Altamiro Souza de Lima Ferraz Junior
  • Altamiro Souza de Lima Ferraz Junior
  • State University of Maranhão, Post-Graduation Program of Agroecology, Maranhão State, Brazil.
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Maria Rosangela Malheiro Silva
  • Maria Rosangela Malheiro Silva
  • State University of Maranhão, Post-Graduation Program of Agroecology, Maranhão State, Brazil.
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  •  Received: 21 December 2015
  •  Accepted: 17 March 2016
  •  Published: 19 May 2016

Abstract

The study aimed to evaluate the efficiency of essential oil concentrations on Cinnamomum zeylanicum leaves as a possible fungicide against mycelial growth, and the sporulation of Corynespora cassiicola in papaya seedling and fruit. The study performed three experiments, namely comparison of the anti-C. cassiicola activity of: 1 µL mL-1 C. zeylanicum essential oil, commercial fungicide, and control-treatment; comparison of the anti-C. cassiicola activity of five essential oil concentrations (0.0, 0.5, 1.0, 2.0, and 4.0 µL mL-1) and a commercial fungicide (150 g ha-1 i.a.); and the effect of applying essential oil concentrations (0.0, 0.5, 1.0, 2.0 and 4.0 µL mL-1) before and after the application of mycelium disk fungus. It was found that the essential oil from C. zeylanicum inhibits mycelial growth and sporulation of the C. cassiicola fungus. The essential oil was able to maintain lower percentage of leaves with lesions in papaya seedling up to 14 days after the inoculation. The essential oil derived from C. zeylanicum, applied as a preventive treatment, is efficient in controlling the size of lesions in papaya fruits, however, the effect is not observed if the essential oil is applied after infection.

Key words: Carica papaya, target-spot, natural pesticides, inhibitory effect.