Agrilus anxius    





common name     Bronze Birch Borer

habitat
Birch groves.

seasonality
June, July and August.

identification
This species along with A. liragus are virtually identical in external appearance. The pronotum and top of the head often have brassy to coppery reflections. On beetles of liragus, there may be two pale pub sent spots on the elytra. Characters of the male genital apparatus will separate the species. The easiest diagnostic character if available is host association. These beetles are found on birch.

life history
The adults first start to emerge in late June and live about 3 weeks. Females oviposit on damaged or weakened trees, in crevices in the bark. Preference is given to exposed, open growing trees, often drought stressed. Eggs are deposited on branches or on the trunk, (usually larger than 25 mm in diameter). Larvae bore into the cambial area. If the tree is healthy it may overgrow the damage, if not the larval tunnelling may kill the branch. The larvae feed under the bark, entering the wood to moult. Pupation occurs in the wood just beneath the bark. Adult exit holes are "D" shaped (Ives and Wong, 1988).

conservation
Common; serious pest of ornamental plantings of birch in our area (Baker 1972).

diet info
Restricted to birch trees, including paper birch, weeping birch and water birch.

range
North America, anywhere birch grows (Baker 1972).

people
species page authorHilchie, Gerald J.2003 

quick link
http://entomology.museums.ualberta.ca/searching_species_details.php?s=3229

 

Logo Department of Museums and Collections ServicesLogo University of Alberta