2012-10-28

Southern Alberta’s air and ground war pays off

Helicopters swooped into the southern Canadian Rockies here almost as soon as mountain pine beetles landed.

Unlike to the north, where a freezing, continental "thermocline" until recently had blocked beetles from entering, this area north of Montana’s Glacier National Park had seen tree-killing outbreaks before, most recently in the early 1980s.

It started again in 2004.