1. International Institute of Tropical Agriculture (Benin Station), 08 BP 0932 Tri Postal, Cotonou, Bénin
2. Georg August University Department of Crop Sciences/Agricultural Entomology, Grisebachstrasse, 6-D370777 Goettingen, Germany
3. Université de Parakou, Faculté d’Agronomie, BP 123 Parakou, Bénin