Common Name: American Aspen Beetle
Gonioctena americana Schaeffer, 1924
Length: 5 to 6 mm
Range: Throughout Alberta
Near trembling aspen
Time of year seen:
May to mid-July
Diet: Trembling Aspen
Other: Adult beetles hibernate over the winter and emerge in
late spring once the trembling aspen have developed most of their foliage.
The adults feed on the edges of the leaves leaving a notched pattern.
After mating the females lay clusters of eggs on the bottom side of the
leaves. The larva emerge shortly after and begin feeding. They
mature in 3 to 4 weeks and drop off the tree to pupate in the soil or
underlying leaf litter. A short time later the Adults emerge and feed
on the aspen for short time before searching out places to over winter.
(Ives et al, 1988)