Zig-zagging across Central Europe: recent range extension, dispersal speed and larval hosts of Aprocerosleucopoda (Hymenoptera, Argidae) in Germany
2014
Blank, Stephan M. | Köhler, Thomas | Pfannenstill, Toralf | Neuenfeldt, Nadine | Zimmer, Bianka | Jansen, Ewald | Taeger, Andreas | Liston, Andrew D.
Aprocerosleucopoda, the zig-zag sawfly, an invasive pest of elms (Ulmus spp.), was found in two separate areas of Germany through July 2014, i.e., a northern area including the states of Berlin, Brandenburg, Mecklenburg-West Pomerania, Saxony and Saxony-Anhalt, and a southern area in Bavaria. A speed of self-dispersal of 45–90 km/yr has been calculated from earlier and present records. Observations of Aprocerosleucopoda in Belgium and the Netherlands during 2013, which are 360–610 km distant from records in Germany of that year, are interpreted as resulting from human-mediated jump dispersal. Larvae, feeding traces and cocoons were frequently found on the native elm species Ulmusminor and Ulmusglabra, whereas none could be detected on Ulmuslaevis. Other occurrences were often on Resista® elms, causing severe defoliation in a recent planting. New host plant records for Aprocerosleucopoda are: Ulmusminor ‘Webbiana’, Ulmusminorvar.suberosa, and the Resista® cultivars Ulmus ‘New Horizon’, Ulmus ‘Regal’ and Ulmus ‘Rebona’. The future dispersal of Aprocerosleucopoda throughout most of Germany is expected, because at least Ulmusglabra and Ulmusminor are widespread in this country.
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