No mating for tree killers: N.B. researchers test new ways of controlling spruce budworm populations

Researchers are testing new ways of keeping another spruce budworm outbreak from happening - by stopping the worm's mothfrom reproducing.

The worms, which can defoliate and kill entire trees, are already wreaking havoc in theMatapediaregion of Quebec and scientists are warning it may not be long before they reach New Brunswick.

To stop them,Rosanne Lamb and Glen Forbes with the Canadian Forest Service have set up a 'mating disruption' project in the Acadia Research Forest east of Fredericton.

They've build a cage made from fine mesh that insects can neitherenter nor exit, in which they keep a seedling fir tree and a couple of budworm moths.

"In the cage we have strings hanging from the top that at different levels throughout that have a pheromone lure on it," said Forbes.

"The idea is that the pheromone we put in here will confuse the males from finding the females."

Massive deforestation

Forbes said they've set up about 60 of the traps in the forest.

They leave the mothinside the cage for a couple of days, after which they dissect the females to see if they mated with the males.

If they didn't, the pheromones did their job and confused the males enough not to seek out any females.

And if they did mate, the researchers will try again, this time with a stronger dose of pheromones, said Lamb.

Sprucebudwormcaused massive defoliationin the province in the1970sand '80s, and although their populationhas been on a downward trend since, scientists started warningof another seriousoutbreak.

The last timethe worms arrivedin the province was in 2016 andLamb said there is a dramaticpopulation increaseabout every 30 years.

Last year, a Campbellton auto dealership saw millions of the moth arrive in its parking lot overnight. So far this year, the dealership hasreported no sightings yet.

• 'Millions' of moths alightat Campbellton auto dealership
• 'Imminent' sprucebudwormoutbreak worries forest industry

"As larvae, they are feeding on the needles [of trees] and year-after-year, afterthe needlesget fed on, time and time again, then over a period offour or five years of heavy feeding it will destroy the tree and kill it," said Lamb.

Trial run traps

Forbes said the traps are a trial run and part ofseveral research projects looking at early intervention strategies.

"There's an existing pheromone out there for spruce budworm that was patented in the 1980s," he said, adding that researchers since discovered new components in thebug's pheromones, which they're now testing.

If it works, they plan to patent the five components used to make the lures and "then we would hopefully be able to use it with industry and help protect forests," said Forbes.

"It is a method of controlling populations without killing anything, really," he said. "By preventing mating you control population."