Ambrosiodmus rubricollis

Wood & Bright, 1992

Ambrosiodmus rubricollis is an ambrosia beetle native to eastern and southern Asia that has been introduced to Europe and North America. As a member of the Ambrosiodmus, it maintains a mutualistic with the white-rot fungus Flavodon ambrosius, which is capable of true wood decomposition—an unusual trait among ambrosia beetles. The has been documented attacking young Tasmanian blue gum trees (Eucalyptus globulus) in Portugal and has been detected in Slovenia and Italy. Its introduction to non-native regions raises concern given the potential of Ambrosiodmus species to pathogenic fungi.

Ambrosiodmus rubricollis 129944118 by Tyler. Used under a CC BY 4.0 license.

Ambrosiodmus (10.3897-zookeys.768.24697) Figure 3 by Gomez DF, Rabaglia RJ, Fairbanks KEO, Hulcr J (2018) North American Xyleborini north of Mexico: a review and key to genera and species (Coleoptera, Curculionidae, Scolytinae). ZooKeys 768: 19-68. https://doi.org/10.3897/zookeys.768.24697. Used under a CC BY 4.0 license.

Xyleborini (10.3897-zookeys.983.52630) Figure 12 by Smith SM, Beaver RA, Cognato AI (2020) A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China. ZooKeys 983: 1-442.. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Ambrosiodmus rubricollis: //æmˌbroʊ.siˈɒd.məs ˌruː.brɪˈkɒl.ɪs//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other ambrosia beetles by asperities (small, rough projections) covering the entire surface of the pronotum. This characteristic was specifically noted as the key diagnostic feature enabling identification of specimens in Slovenia.

Images

Habitat

Deciduous temperate forests; commercial plantations of Tasmanian blue gum (Eucalyptus globulus).

Distribution

Native to eastern and southern Asia; introduced to Europe (Italy, Slovenia, Portugal) and North America. GBIF records indicate presence in Australia, Europe and Northern Asia (excluding China), Middle America, North America, and Southern Asia.

Diet

Feeds on ambrosia fungus cultivated in -constructed galleries. Based on -level research, the primary fungal is Flavodon ambrosius, a white-rot decay fungus capable of decomposing wood and converting it into nutritious food for the beetle.

Behavior

Attracted to ethanol-baited traps. Constructs galleries in wood where fungal gardens are cultivated. remain in galleries to reproduce, enabling development of semi-social colonies.

Ecological Role

As an ambrosia beetle, participates in a mutualism with Flavodon ambrosius that facilitates wood decomposition. The its fungal between trees. May contribute to tree decline in plantation settings, though its specific role as a primary or secondary pest remains unclear.

Human Relevance

Potential forest pest in non-native ranges. Documented attacking young Eucalyptus globulus in commercial plantations in Portugal. Concern exists regarding ability to pathogenic fungi, though direct evidence of tree mortality caused by this is limited.

Similar Taxa

Xylosandrus germanusBoth are non-native ambrosia beetles in Europe detected through similar monitoring methods (ethanol-baited traps). Distinguished by pronotal asperities in A. rubricollis versus different pronotal sculpturing in X. germanus.
Ambrosiophilus atratusCo-occurs as a non-native ambrosia beetle in Slovenia; both were first recorded in the same 2017 monitoring effort. Separated by morphological characteristics including pronotal features.
Other Ambrosiodmus speciesShare the unusual wood-decomposing fungal with Flavodon ambrosius. Specific identification requires examination of pronotal asperities and other subtle morphological differences.