Ausbreitung des Rapsglanzkäfers innerhalb eines Feldes und in der Landschaft

Summary

Pollen beetles (Meligethes sp.) are important pests in oilseed rape (Brassica napus).
In our study we wanted to determine which landscape structures have an influence on pollen beetle population in early spring. The dynamics of pollen beetle population and
the damages on rape were studied on field scale level with 100 sampling points per field and on landscape scale level with 18 organic oilseed rape fields which differed by
the complexity of the surrounding landscapes. The number of pollen beetle was strongly correlated with the distance to a forest. At the beginning of the flight period more pollen beetles were found close to the forest, later they migrated to the rest of the field. In addition, agricultural practices appeared to be determinant for pest control.Less pollen beetles per plant were found in fields with a higher density of rape plants.