In honey bees enhancement of cGMP dependent protein kinase expression accompanies the behavioural transition from in hive working nursing bees towards outdoors foraging worker bees. Accordingly this gene was named amfor or Apis mellifera foraging gene. In the red harvester ant Pogonomyrmex barbatus a gene homologue affected food seeking behaviour as well but in this species the PKG expression decreased from the onset of foraging behaviour. Since the wasp Vespula vulgaris is phylogenetically positioned between both species in this paper we tried to elucidate whether the involvement of PKG in foraging behaviour can be extended to this species and if so, whether its expression is enhanced or decreased at the moment of transition. To enable this candidate gene approach, we first had to clone the PKG homologue from the common wasp. QPCR indicated a relevantly higher expression of Vvfor in nursing versus foraging wasps although interpretation of the results was hampered by a remarkable degree of variation as could be predicted from in the wild captured wasps as a source for mRNA extraction and quantification.