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Contribution à l'évaluation des potentialités d'Encarsia sp. (Hymenoptera: Aphelinidae) comme agent de lutte biologique contre la mouche blanche du cotonnier, Bemisia tabaci (Homoptera: Aleyrodidae) au Burkina Faso

Published online by Cambridge University Press:  28 February 2007

Olivier Gnankiné ,
Doulaye Traoré ,
Antoine Sanon ,
Remi Dabire  and
Patoin Albert Ouedraogo
Olivier Gnankiné*
Affiliation:
Institut de l'Environnement et de Recherches Agricoles, Programme Coton, BP 208 Bobo-Dioulasso, Burkina Faso UFR/SVT, Université de Ouagadougou, 03 BP 7021 Ouagadougou 03, Burkina Faso
Doulaye Traoré
Affiliation:
Institut de l'Environnement et de Recherches Agricoles, Programme Coton, BP 208 Bobo-Dioulasso, Burkina Faso
Antoine Sanon
Affiliation:
UFR/SVT, Université de Ouagadougou, 03 BP 7021 Ouagadougou 03, Burkina Faso
Remi Dabire
Affiliation:
Institut de l'Environnement et de Recherches Agricoles, Programme Coton, BP 208 Bobo-Dioulasso, Burkina Faso
Patoin Albert Ouedraogo
Affiliation:
UFR/SVT, Université de Ouagadougou, 03 BP 7021 Ouagadougou 03, Burkina Faso
*
*:Email: olgnankine@hotmail.com
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Abstract

Encarsia sp. is the main solitary endoparasitoid developing on the larvae of the cotton whitefly Bemisia tabaci (Gennadius), in western Burkina Faso. The biological control potential of this parasitoid is currently under investigation. Studies of some population parameters and biological control assays have been undertaken in the laboratory and greenhouse. Encarsia sp. can develop on the four larval stages of B. tabaci obtained in our study conditions, 7 to 15 days after oviposition. The highest rates of parasitism were recorded on the third and fourth larval stages of B. tabaci. The duration of Encarsia development was shorter on the third and fourth than on the first and second instars. The emergence rate of the F1 generation was high (>80%) and seemed not to be related to the different host stages. The sex-ratio favoured females (6:1). Encarsia adults have a relatively short lifespan (<5 days) and males live twice as long as females. In experimental cages, parasitism levels fluctuated over time, and significantly increased with the number of parasitoids introduced. This study constitutes an important advance in assessing the potential of Encarsia sp. for biological control of B. tabaci in cotton crops in Burkina Faso.

Keywords

Bemisia tabaciEncarsia spendoparasitiodpopulation parametersreleasesbiological control
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 25 , Issue 4 , December 2005 , pp. 266 - 273
Copyright
Copyright © ICIPE 2005

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