Gesunde Pflanzen (2005) 57, 73-80
A. Wudtke, H.E. Hummel and C. Ulrichs (2005)
Der Westliche Maiswurzelbohrer Diabrotica virgifera virgifera LeConte (Col.: Chrysomelidae) auf dem Weg nach Deutschland
[The Western corn rootworm Diabrotica virgifera virgifera LeConte en route to Germany]
Gesunde Pflanzen 57 (4), 73-80
Abstract: The Western corn rootworm, Diabrotica virgifera virgifera (Col.: Chrysomelidae) (Dvv), is one of the most important insect pests on corn in North America. After its accidental introduction into Serbia prior to 1993, it is now actively spreading throughout southeastern Europe and from there into central Europe. As of 2004, Germany is still considered free of Dvv, but with the exception of its neighboring states Denmark and Poland is almost totally surrounded by countries with readily detectable Dvv infestations. Possible routes of immigration are discernable: (1) from the south via Italy, Switzerland, and France into the German state of Baden-Wuerttemberg, (2) from the southeast via Austria, the Czech Republic, Croatia, Hungary, and Slovenia into Bavaria, and (3) from the northwest via France, Belgium, the Netherlands, and England. Route 1 via Switzerland and Alsace in France is the most likely, and introduction may occur anytime in 2005, if it has not silently taken place already. The distance between Blotzheim Airport and the southwestern German border is about 5 km; the distance between the Swiss city of Winterthur and the southern German border is about 35 km. Both locations had documented infestation. Investigations in 2004 along Route 1 provide evidence for increasing numbers of Dvv occupying trapping locations situated near major traffic centers such as airports, freeways, alpine tunnels for transeuropean roads and railways, railyards, and tourist service centers, in short all major distribution centers for goods and services. These routes unfortunately emphasize the active role of mankind as the major distribution vector for Dvv. Investigations were facilitated by highly sensitive trapping techniques such as Metcalf traps baited with pheromone and kairomone lures. They were deployed at locations from the Italian/Swiss border crossing at Chiasso, to distribution centers within the Magadino region in northern Ticino and merging into two major connecting routes leading to the mountain passes and tunnels of St. Gotthard and San Bernardino and points further north. Mandatory crop rotation measures in the Ticino region could actually reduce but not eliminate the recent progress of Dvv northward. Given the recent encroachment, its importation into German territory is pending and seems to be unavoidable.
Der Westliche Maiswurzelbohrer, Diabrotica virgifera virgifera (Dvv) LeConte (Coleoptera: Chrysomelidae), ist einer der wichtigsten Maisschädlinge in Nordamerika. Seit seiner Einschleppung nach Serbien und seinem Nachweis bei Belgrad im Jahr 1993 breitet er sich schnell über Südosteuropa und von dort zunehmend nach Zentraleuropa aus. Bis 2004 war Deutschland zwar noch frei von Dvv, ist aber außer an seiner Nordost- und Nordflanke von Ländern mit nachweislichen Dvv-Populationen umgeben. Es gibt außer stets möglichen Einschleppungen durch Flugzeuge drei Hauptrichtungen für das terrestrische Vordringen auf deutsches Staatsgebiet. Von diesen ist die südlich-nördliche Stoßrichtung von der Lombardei in Norditalien über den Tessin und die Nordschweiz bis nach Südbaden die wahrscheinlichste. Sie folgt einem sehr gut ausgebauten Straßen- und Schienennetz durch die Schweiz mit hochentwickelten Verteilungszentren für Güter und Dienstleistungen, womit die aktive Mitwirkung des Menschen als Verbreitungsvektor des Schädlings unterstrichen wird. Erzwungene Fruchtfolgevorschriften im Schweizer Kanton Tessin konnten die Ausbreitung nach Norden zwar bremsen, aber nicht verhindern. In Anbetracht seines jüngsten Vordringens bis an die deutschen Grenzen dürfte die Einschleppung von Dvv auf deutsches Staatsgebiet bevorstehen und als längerfristig unvermeidlich gelten.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: German)
Link to article at publishers website
Database assignments for author(s): Christian Ulrichs
Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
new introduction of pest
Pest and/or beneficial records:
Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
---|---|---|---|---|
Diabrotica virgifera | Austria | |||
Diabrotica virgifera | Belgium | |||
Diabrotica virgifera | Croatia | |||
Diabrotica virgifera | Czech Republic | |||
Diabrotica virgifera | France | |||
Diabrotica virgifera | Hungary | |||
Diabrotica virgifera | Italy | |||
Diabrotica virgifera | Serbia | |||
Diabrotica virgifera | Slovenia | |||
Diabrotica virgifera | Switzerland |