Journal of Plant Diseases and Protection

, Volume 126, Issue 1, pp 93–95 | Cite as

First record of the impact of the parasitism of Cecidochares connexa (Diptera: Tephritidae) by a solitary larval ectoparasitoid in West Africa: Cause for concern?

  • Pascal Osa Aigbedion-AtalorEmail author
  • Itohan Idemudia
  • Arne B. R. Witt
  • Michael D. Day
Short Communication


Cecidochares connexa is currently the only effective biological control agent of Chromolaena odorata an invasive weed in West Africa. Recently, an ectoparasitoid species belonging to the Ormyrus genus was found parasitizing C. connexa in three regions of Ghana. Adult parasitoid emergence percentages varied between 16 and 21%. This raises concerns about its impact on C. connexa populations and the overall biocontrol of C. odorata. New field surveys to determine the distribution range of Ormyrus sp. and its impact on C. connexa should be quickly addressed in West Africa.


Post-release evaluation Ormyrus sp. Stem-galling fly Chromolaena odorata West Africa 



This work was supported by the German Academic Exchange Services (DAAD) through the African Regional Postgraduate Programme in Insect Science (ARPPIS), University of Ghana, Legon, Ghana. We thank Gerhard Prinsloo and the Agricultural Research Council (ARC) Pretoria, South Africa, for identifying the parasitoid to the genus level. We gratefully acknowledge the curator, Mr. Prempeh, of Aburi Botanical Gardens in Ghana. Special thanks to M. Adom for field and laboratory assistance.

Authors’ contributions

PO and BRA designed the study, PO conducted the surveys and experiments, PO analyzed the data, PO, MD, and I wrote the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.


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Copyright information

© Deutsche Phytomedizinische Gesellschaft 2018

Authors and Affiliations

  • Pascal Osa Aigbedion-Atalor
    • 1
    • 5
    Email author
  • Itohan Idemudia
    • 2
  • Arne B. R. Witt
    • 3
  • Michael D. Day
    • 4
  1. 1.International Center of Insect Physiology and EcologyNairobiKenya
  2. 2.Department of Animal and Environmental BiologyUniversity of BeninBenin CityNigeria
  3. 3.CABINairobiKenya
  4. 4.Biosecurity Queensland, Department of Agriculture and FisheriesEcosciences PrecinctBrisbaneAustralia
  5. 5.Centre for Biological Control, Department of Zoology and EntomologyRhodes UniversityGrahamstownSouth Africa

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