The alien invasive seed beetle Megabruchidius dorsalis (Chrysomelidae) established in Slovenia


  • Eva Horvat Univerza v Mariboru, Fakulteta za naravoslovje in matematiko, Koroška cesta 160, SI-2000 Maribor
  • Nina Šajna Univerza v Mariboru, Fakulteta za naravoslovje in matematiko, Koroška cesta 160, SI-2000 Maribor



Coleoptera, Bruchinae, the honey locust, Gleditsia triacanthos, the Kentucky coffeetree, Gymnocladus dioicus, alien species


The Asian seed beetle Megabruchidius dorsalis, which develops inside the seeds of native Gleditsia species, was first recorded in Europe in Italy in 1989. In Slovenia, it was first recorded in Maribor in 2017. Its presence was confirmed in 15 other European countries. In the new range, the seed beetle switched to two new hosts from North America, the honey locust (Gleditsia triacanthos) and the Kentucky coffeetree (Gymnocladus dioicus) both related to the Asian Gleditsia species. Mature G. triacanthos and Gy. dioicus seed pods were collected from the ground at locations in the central and the northeastern parts of Slovenia to investigate the presence of M. dorsalis outside the first described locations in Maribor. Seed pods were kept in bags under constant conditions in laboratory. Exit holes of seed pods and seeds typical of M. dorsalis were found at 36 locations (97%), while alive or dead M. dorsalis beetles were recorded at 26 locations (70%).


Baskin CC, Baskin JM. 1998. Seeds: ecology, biogeography, and evolution of dormancy and germination. San Diego (US): Academic Press. DOI:

Bright C. 1998. Life out of bounds: bioinvasion in a borderless world. New York (US): WW Norton.

Bruneau A, Forest F, Herendeen PS, Klitgaard BB, Lewis GP. 2001. Phylogenetic relationships in the Caesalpinioideae (Leguminosae) as inferred from chloroplast trnL intron sequences. Systematic Botany. 26(3): 48-514.

Callot H, Brua C, Wagner A. 2016. Bruches exotiques en Alsace: Acanthoscelides pallidipennis (Motschulsky, 1874), Bruchidius siliquastri Delobel, 2007 et Megabruchidius dorsalis (Fåhraeus, 1839) (Coleoptera, Chrysomelidae, Bruchinae) Entomofaune des gousses de Gymnocladus dioica (L.) K. Koch et comportement aberrant d’un Curculio glandium Marsham, 1802 (Coleoptera, Curculionidae). Bulletin de la Société entomologique de France. Mulhouse. 72(3): 37-44.

Early R, Bradley B, Dukes J, Lawler JJ, Olden JD, Blumenthal DM, Gonzalez P, Grosholz ED, Ibañez I, Miller LP, et al. 2016. Global threats from invasive alien species in the twenty-first century and national response capacities. Nature Communications. 7: 12485. DOI:

Ferreras AE, Galetto L. 2010. From seed production to seedling establishment: Important steps in an invasive process. Acta Oecologica. 36(2): 211-218. DOI:

Fritzsche K, Booksmythe I, Arnqvist G. 2016. Sex ratio bias leads to the evolution of sex role reversal in honey locust beetles. Current Biology. 26(18): 2522-2526. DOI:

György Z, Tuda M. 2020. Host-plant range expansion to Gymnocladus dioica by an introduced seed predatory beetle Megabruchidius dorsalis. Entomological Science. 23(1): 28-32. DOI:

Horvat E, Šajna N. 2021a. First record of the Asian seed beetle Megabruchidius dorsalis (Fåhræus, 1839) (Coleoptera, Chrysomelidae, Bruchinae) in Croatia. BioInvasions Records. 10(2): 477-482. DOI:

Horvat E, Šajna N. 2021b. Exploring the impact of a non-native seed predator on the seed germination of its non-native host. Biological Invasions. 23(12): 3703-3717. DOI:

Kurota H, Shimada M. 2001. Photoperiod‐and temperature‐dependent induction of larval diapause in a multivoltine bruchid, Bruchidius dorsalis. Entomologia Experimentalis et Applicata. 99(3): 361-369. DOI:

Kurota H, Shimada M. 2002. Geographical Variation in the Seasonal Population Dynamics of Bruchidius dorsalis (Coleoptera: Bruchidae): constraints of temperature and host plant phenology. Environmental Entomology. 31(3): 469-475. DOI:

Migliaccio E, Zampetti MF. 1989. Megabruchidius dorsalis e Acanthoscelides pallidipennis, specie nouve per la fauna Italiana. Bollettino Dell Associazione Romana Di Entomologia. 43: 63-69.

Or K, Ward D. 2003. Three–way interactions between Acacia, large mammalian herbivores and bruchid beetles‐a review. African Journal of Ecology. 41(3): 257-265. DOI:

Pintilioaie AM, Manci CO, Fusu L, Mitroiu MD, Rădac AI. 2018. New invasive bruchine species (Chrysomelidae: Bruchinae) in the fauna of Romania, with a review on their distribution and biology. Annales de la Société entomologique de France. 54(5): 401-409. DOI:

Reinhardt M, Gloyna K, Hofrichter K. 2020. Record of the bruchid beetle Megabruchidius dorsalis (FÅHREUS) 1839 in Saxony. Entomologische Nachrichten und Berichte. 64: 149-158.

Rheinheimer J. 2014. Megabruchidius tonkineus neu für BadenWürttemberg und M. dorsalis neu für Deutschland (Coleoptera: Bruchidae). Mitteilungen Des Entomologischen Vereins Stuttgart. 49(2): 61-63.

Richardson DM, Pyšek P, Rejmánek M, Barbour MG, Panetta FD, West CJ. 2000. Naturalization and invasion of alien plants: concepts and definitions. Diversity and Distributions. 6: 93-107. DOI:

Šajna N. 2019. First record of non-native Asian seed beetle, Megabruchidius dorsalis (Fåhraeus, 1839) and its parasitoid, in Slovenia. BioInvasions Records. 8(3): 515-520. DOI:

Šipek M, Horvat E, Šajna N. 2022. First records of seed beetles Megabruchidius dorsalis and M. tonkineus from three Balkan countries. BioInvasions Records. 11(1): 101-109. DOI:

Vrezec A, Kapla A, Jurc M. 2012. Prvi seznam tujerodnih vrst hroščev (Coleoptera) v Sloveniji. Acta Entomologica Slovenica. 20(2): 157-178.

Takakura KI. 1999. Active female courtship behavior and male nutritional contribution to female fecundity in Bruchidius dorsalis (Fahraeus) (Coleoptera: Bruchidae). Population Ecology. 41(3): 269-273. DOI:

Tuda M, Morimoto K. 2004. A new species Megabruchidius sophorae (Coleoptera, Bruchidae), feeding on seeds of Styphnolobium (Fabaceae) new to Bruchidae. Zoological Science. 21(1): 105-110.;2 DOI:[105:ANSMSC]2.0.CO;2






Scientific paper

How to Cite

Horvat, E., & Šajna, N. (2022). The alien invasive seed beetle Megabruchidius dorsalis (Chrysomelidae) established in Slovenia . Natura Sloveniae, 24(1), 5-16.

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