Adult mountain pine beetle or Dendroctonus ponderosae, collected in Grande Prairie from the Olds College insect collection. Photo by Ken Fry/Olds College

Cold snap likely knocked down some mountain pine beetles in central Alberta but not all

It was cold during last week’s deep freeze in central Alberta, but not cold enough to take the mountain pine beetle out completely.

It would’ve had an impact on the pests, enough to set them back, said an Olds College horticulture instructor Ken Fry.

This means the cold killed off some beetles, but it didn’t eradicate them.

Before European settlers, there weren’t that many beetles to kill, and therefore, there weren’t that many beetles to rebound. But in the last, say, 150 years ago, the populations have been building and they’re “quite substantial,” Fry said Thursday.

“So say we have a cold spell, like the one we just had, and it lasts a week and it kills 98 per cent of the beetles, hypothetically speaking.

“If you have a million beetles, that’s still a lot of beetles left over. So you would have to kill 99.999 per cent. So the more animals that are there, the more severe the corrective measure has to be,” he said.

For elimination of the pests, the cold snap would have to be longer – a prolonged one of -30 C to -40 C to kill the high populations in the province.

“You would have to kill virtually all of them, because even if a few survive, they’re going to lay 100s eggs each. Not all those eggs are going to hatch, and reach adulthood, but you get the sense of scale we’re dealing with.”

Not only would the cold have to be severe for longer, but also timely to eradicate them.

The mountain pine beetle is particularly well prepared for winter, like many insects. The pest takes protective measures and produces sugars, alcohols and glycols, compounds that bind to water like anti-freeze. These compounds prevent water from forming ice crystals (similar to freezer burn), which protects the insects’ cells.

In the dead of winter, they have maximum production of these protective compounds.

“If we had a cold snap, the one we saw a week ago, if that happened in late October or in early March, it would have a much more devastating effect,” he explained.

Cold snaps have an impact on pests, such as aphids, but also on insects that are beneficial to the ecosystem, such as bees and wasps.

“That’s why it’s so unfortunate. When we think of pests, that’s only one per cent of species out there. Ninety-nine per cent of insects out there are beneficial, whether those are pollinators, predators, decomposers,” he said.

Like us on Facebook and follow us on Twitter

Alberta Weather

Get local stories you won't find anywhere else right to your inbox.
Sign up here

Just Posted

Calgary blocks traffic lanes to help pathway users maintain two-metre separation

CALGARY — Fans of a decision by Calgary officials to block off… Continue reading

A message from the Advocate publisher

In good times and bad, The Red Deer Advocate has been here… Continue reading

City at centre of China’s virus outbreak gradually revives

WUHAN, China — Shopkeepers in the city at the centre of China’s… Continue reading

Spain passes China in infections; Trump extends US lockdown

MADRID — In an abrupt turnaround, President Donald Trump extended lockdown measures… Continue reading

Crucial details of Ottawa’s proposed wage subsidy program expected today

OTTAWA — Businesses and employees across Canada reeling from the COVID-19 crisis… Continue reading

Alberta Health Services provides COVID-19 prevention tips

Alberta Health Services has a number of recommendations for people amid the… Continue reading

Alberta government website has latest COVID-19 statistics

Red Deer Advocate readers can stay up to date on the COVID-19… Continue reading

‘I Love Rock and Roll’ co-writer dies of virus complications

NEW YORK — Alan Merrill — who co-wrote the song “I Love… Continue reading

‘Worse than any flu’: Canadians describe how it feels to have COVID-19

“I woke up with a little scratch in my throat and started trying to cough it up”

Feds rolling out help for charities hit hard by COVID-19 economic slowdown

OTTAWA — The federal government signalled Sunday it is shifting the focus… Continue reading

Five things to watch for in the Canadian business world in the coming week

Thousands have already lost their jobs, while others like grocers look for ways to keep doors open

Athletes, musicians help raise 500,000 euros to fight virus

“It’s a very difficult situation, and for the league to be able to do something like this, it makes players, clubs and fans very proud”

Most Read