Effects of Cry1Ab protoxin, deltamethrin and imidacloprid on the foraging activity and the learning performances of the honeybee Apis mellifera, a comparative approach Ricardo Ramirez-Romero, Josette Chaufaux and Minh-Hà Pham-DelègueApidologie, 36 4 (2005) 601-611DOI: https://doi.org/10.1051/apido:2005039