Leptoglossus occidentalis Heidemann, 1910

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English Western conifer seed bug Status LU: established. 1st record: 2009.
Lëtzebuergesch Amerikanesch Kiferwanz Status Eur.: established.
Français Punaise américaine du pin RA: ISEIA: B1, Watch List. Harmonia+: n/a.
Deutsch Amerikanische Kiefernwanze Wikipedia: Wikipedia - English - Western conifer seed bug Wikipedia - Français - Punaise américaine du pin Wikipedia - Deutsch - Amerikanische Kiefernwanze Nederlands | Wikispecies: Wikispecies - Leptoglossus occidentalis | CABI
Nederlands Bladpootrandwants Back to the list of invertebrates

Report the species

Report Leptoglossus occidentalis to the National Museum of Natural History.

Brief description

Leptoglossus occidentalis in Echternach, wall of 1A rue des Romains, 15 October 2017. Photo by Gaby Geimer.

Leptoglossus occidentalis in Echternach, wall of 1A rue des Romains, 15 October 2017. Photo by Gaby Geimer.

Leptoglossus occidentalis Heidemann, 1910 is a North American bug native of the Rocky Mountains. It was observed for the first time in October 1999 in Europe, near Vicenza in Italy. Following several introductions to our continent, the expansion of the species has been very rapid. Leptoglossus occidentalis was reported in Switzerland in 2002, in Slovenia and Spain in 2003, in Croatia and Hungary in 2004, in Austria in 2005 and in France in 2006. In 2007 it was reported in Germany, the Czech Republic, the United Kingdom and Belgium as well as in Poland, and in 2008 in Bulgaria, Montenegro, Serbia and the Netherlands (Schneider 2010: 115).

Status and distribution in Luxembourg

Records of Leptoglossus occidentalis Heidemann, 1910 in Luxembourg. Data source: Recorder-Lux, iNaturalist & GBIF, 2023-11-28.

The species was first observed in Luxembourg by Guy Marson in Steinfort on 9th October 2009 (Schneider 2010: 116).

94 occurrences of Leptoglossus occidentalis are documented in the mdata.mnhn.lu portal (MNHNL, iNaturalist & GBIF, 2020).

Risk assessment

ISEIA protocol

B1 (3+3+2+1) = Watch List (Ries et al. 2017: 68).

Harmonia+ protocol

Not assessed yet.

Worldwide distribution


  • CABI, 2019. Leptoglossus occidentalis Heidemann, 1910. In: Invasive Species Compendium. Wallingford, UK: CAB International. URL: www.cabi.org/isc [accessed 2020-04-10]
  • MNHNL, iNaturalist & GBIF, 2020. Leptoglossus occidentalis Heidemann, 1910 in MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: https://mdata.mnhn.lu [accessed 2020-04-10]
  • Ries, C., A. Arendt, C. Braunert, S. Christian, A. Dohet, A. Frantz, G. Geimer, M. Hellers, J. A. Massard, X. Mestdagh, R. Proess, N. Schneider & M. Pfeiffenschneider, 2017. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of invertebrates in Luxembourg. Bull. Soc. Nat. luxemb. 119: 63-70. [PDF 360 KB]
  • Schneider, N., 2010. Découverte de Leptoglossus occidentalis Heidemann, 1910 et redécouverte de Lygaeus equestris (L., 1758) au Luxembourg (Insecta, Hemiptera, Heteroptera). Bull. Soc. Nat. luxemb. 111: 115-116. [PDF 238 KB]

 Page content last updated on 2020-04-10. Last proofread by Caroline Grounds on 2019-12-10.