Institution: | a Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium b Laboratory of Zoophysiology, Department of Physiology, Faculty of Sciences, Ghent University, K.L. Ledeganckstraat 35, B-9000 Ghent, Belgium c Bieneninstitut Kirchhain, Landesbetrieb Landwirtschaft Hessen, Erlenstr. 9, D-35274 Kirchhain, Germany d Biobest NV, Ilse Velden 18, B-2260 Westerlo, Belgium |