Abstract
Nizar Haddad, Jens Esser and Peter Neumann Bee Research Unit, National Centre for Agricultural Research and Extension, Baqa’, Jordan. Dietzgenstr. 57, 13156 Berlin, Germany. Swiss Bee Research Centre, Agroscope Liebefeld-Posieux Research Station ALP, CH-3033 Bern, Switzerland. Eastern Bee Research Institute of Yunnan Agricultural University, Kunming, Yunnan Province, China. Department of Zoology and Entomology, Rhodes University, Grahamstown 6140, South Africa.
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