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Pathogenicity and Antifeedant Activity of Entomopathogenic Hyphomycetes to the Cowpea Leaf Beetle, Ootheca mutabilis Shalberg

Published online by Cambridge University Press:  19 September 2011

S. Ekesi
S. Ekesi
Affiliation:
Department of Crop Protection, Ahmadu Bello University, P.M.B. 1044, Zaria, Nigeria
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Abstract

Conidial suspensions of four isolates each of Beauveria bassiana and Metarhizium anisopliae were evaluated in the laboratory for their virulence to adult Ootheca mutabilis. All the isolates tested were pathogenic to the beetle, but to varying degrees. Three of them, B. bassiana CPD 3 and CPD 10 and M. anisopliae CPD 6 were superior to all other isolates in terms of mortality induced on adult beetle, LT50 and LC50, with B. bassiana CPD 3 having the lowest LC50 value. In feeding assays; consumption by beetles treated with B. bassiana CPD 3 was significantly reduced within 2 days treatment (DAT) and the trend continued until 7 DAT, when all the beetles died. The antifeedant effects of the pathogen on O. mutabilis could partly offset its slow speed of kill, and might play an important role in field control.

Résumé

Les suspensions de conidies de quatre isolats de Beauveria bassiana et de Metarhizium anisopliae ont été testées au laboratoire pour leur virulence contre des adultes de Ootheca mutabilis. Tous les isolats sont pathogènes pour les coccinelles mais à des degrés variables. Trois d'entre eux, B. bassiana CPD 3 et CPD 10 et M. anisopliae CPD 6, sont supérieurs aux autres en terme de mortalité induite, LT50 et LC50. Cependant, parmi les trois isolats, B. bassiana CPD 3 a une valeur de LC50 significativement inférieure à celle des deux autres. Lors du test de consommation de feuilles, la quantité ingérée par les coccinelles traitées avec B. bassiana CPD 3 a été significativement plus faible 2 jours après le traitement et l'effet s'est prolongé jusqu'au 7éme jour lorsque toutes les coccinelles sont mortes. Les effets antiappétants du pathogène pourraient en partie expliquer la faible vitesse de mortalité des coccinelles et jouer un rôle important lors du contrôle au champ.

Keywords

entomopathogenBeauveria bassianaMetarhizium anisopliaecowpea leaf beetleOotheca mutabilisentomopathogèneBeauveria bassianaMetarhizium anisopliaeChrysomèle du NiébéOotheca mutabilis
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 21 , Issue 1 , March 2001 , pp. 55 - 60
Copyright
Copyright © ICIPE 2001

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