This thesis deals with the investigation and documentation of wild bees fauna in the second year of change to organic farming in "Marchfeld" (Lower Austria). Two year old field stripes, which called bloom-stripes, with different seed mixtures and spontaneous succession, longstanding stripes along hedges, agricultural fields and on uncultivated land were examined. For better registration of species nesting above ground at the bloom-stripes, the settlement of nesting habitats were documented. The documentation of wild bees was recorded by collecting bees that were sighted with a dip net from April to September 2004. The settlement was documented with a digital camera. In the year 2004 there were 33 wild bees species documented at the organic farm "Rutzendorf". The highest rate of species was found at landscape elements which have existed already for many years, also high numbers of specialised species were obtained at the two year old bloom-stripes. Differences between seed mixtures were not established. Compared to the field studies sites characterised by landscape elements show a higher diversity of wild bees and a higher number of specialised species and species nesting above ground. The evaluation of nesting habitats reflected these results.