[1] Julius Kuhn Inst, Inst Plant Protect Field Crops & Grassland, Messeweg 11-12, D-38104 Braunschweig, Germany
[2] Univ Hohenheim, Apiculture Inst, D-70599 Stuttgart, Germany
[3] Julius Kuhn Inst, Inst Ecol Chem Plant Anal & Stored Prod Protect, D-14195 Berlin, Germany
[4] LAVES Inst Bienenkunde Celle, D-29221 Celle, Germany
[5] Bayer Landesanstalt Weinbau & Gartenbau, Fachzentrum Bienen, D-97209 Veitshochheim, Germany
[6] Bayer Crop Sci, D-40789 Monheim, Germany
[7] Syngenta Agro GmbH, D-63477 Maintal, Germany
[8] BASF SE, D-67117 Limburgerhof, Germany