It was a cold snap of the winter of 2019 that really started to significantly bring down the population of mountain pine beetles.
Parks Canada has been conducting two surveys on the situation every year, the first of which is the overwintering larva survival survey. It takes place in the spring when surveyors can peel off a piece of bark in a test area so they can count the larvae, both living and the dead, underneath.Article content
“It’s probably been in the last three winters where we’ve had really good winter conditions that have killed those overwintering larvae to the point where now, this year’s survey … no larvae found whatsoever. Not a single living larva was found,” Argument said.Later in the year, Parks conducts an aerial survey over a broader section of Jasper National Park.
“That’s an incredibly small area relative to the big picture of the park. Some of that may be an effect of other types of forest insects — bark beetles and wood-boring beetles — that have killed already weakened trees. But to say only 95 hectares this year of impacted trees … that basically means a beetle is done. It’s collapsed. And it’s gone,” Argument saidArticle content
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