摘要：For approximately 30 years a successive rise of the
population of Melolontha hippocastani F. has been
observed in Germany, taking place especially in the
vicinity of the river Rhine between Karlsruhe and
Frankfurt/Hanau (Kovac 1998, Brückner and Willig
1999, Schröter 2000, Delb 2004, Zimmermann 2004).
The appearance of Melolontha hippocastani in the
region of Hanau-Alzenau (Immler 2008) is probably
due to an areal extension of this species. The spreading
and flight of Melolontha in the western part of the
Bavarian-Hessian border was documented already as
early as 1957. However, there was no overlapping
with the Bavarian and Hessian state forests (Gersdorf
1958, Zimmermann 2004). Because of the menace of
mass gradation of the Melolontha hippocastani test
excavations were carried out by the Bavarian State
Institute of Forestry (LWF, Freising) to get more information
about the density of the larvae. In spring 2008
followed a survey about the damages on natural
regeneration in stands. A documentation about
beetles’ hatching, swarming and feeding has been
carried out from April to June 2008.
关键词：Forest cockchafer, Melolontha
hippocastani, mass gradation,
monitoring
