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Tremex fuscicornisFabricius

Established populations recently discovered in Chile

IDENTITY

Name: Tremex fuscicornis Fabricius
Taxonomic Position:
Animalia: Arthropoda: Insecta: Hymenoptera: Siricidae

Significance:
This species is a recently introduced pest in Chile, where it was first noticed in Feb 2000 in dead poplar trees close to Santiago. It is believed that the insect entered the country in wood crates from China. Although T. fuscicornis is not considered a pest in its natural range of distribution, it has caused considerable economic damage in Chile. The authorities there are also concerned about the threats it may pose to ornamental trees, natural areas and the fruit industry.There are no records indicating that T. fuscicornis occurs in the US. If introduced, it could pose a significant risk to the lumber and fruit industry.

Issues of Concern: All life-stages of this Siricid can be found in infested wood. They can easily survive even long journeys within solid wood packing materials or other objects made from infested wood. Adults are excellent flyers and can cover distances of several kilometers. Although some hosts, such as Populus and Salix, may be more preferred than others, T. fuscicornis has the ability to feed on a wide range of tree species. Chile annually exports US$ 2 million worth of products made from poplar wood.

Pathways: Solid wood packing materials; lumber

Hosts: Trees of the genera Populus; Salix; Fagus; Ulmus; Acer; Betula; Quercus; Prunus; Malus; Pterocarya; Robinia; Juglans; Zelkova; Celtis; Carpinus

Distribution:
Europe; S. Siberia; China; Korea; S. America

In Chile it is now present in almost the entire Region Metropolitana, and in several other, smaller areas.

Quarantines: Within Chile, several areas have been placed under quarantine.

Detection Strategies
Options include checking wood for adult emergence holes, looking for adults or adult body parts, trapping adults by surrounding wood with insect mesh, and digging into wood to look for larvae and pupae

Comments:
Prefers stressed and sick trees. In Chile, Populus nigra seems to be the preferred host. A symbiotic fungus is associated with this insect which causes tree death and renders the wood worthless. An ichneumonid wasp that is a natural enemy of T. fuscicornis has been detected in Chile, but is not an effective control agent. A strain of Beauveria bassiana was isolated from dead T. fuscicornis.

OTHER INFORMATION:
Source: Servicio Agricola y Ganadero, Chile

References:
Finnish University and Research Network. 2000. Tremex.


Warning: The information in this archived item was not confirmed with the appropriate National Plant Protection Organization and is provided solely for informational purposes. Please use this information with caution.

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