"It depends on which bug you're talking about," Donald Eggen, forest health manager with the Pennsylvania Department of Conservation and Natural Resources (DCNR) noted.
DCNR issued a statement Friday citing the impact below-average temperatures have had on the Hemlock Woolly Adelgid.
According to the report, the agency is seeing massive die-offs of the invasive species.
"Right now, the insects are starting to become active, so it doesn't have to get that cold to impact them," Eggen
"It gives us time to catch our breath," Eggen
said, adding, "[Adelgids] can suffer up to like 90-some percent reduction and still re-populate."
noted this is possible because all Hemlock Woolly Adelgids are female and lay eggs, so even a single specimen can re-populate an area.
"You get further south to the Smokies (mountains), where it never gets real cold and the hemlock are devastated," Eggen
The species, which originated in Asia, feeds on the fluids within Hemlock branches.
While the species has come to threaten the entire Eastern United States, it is particularly worrisome in Pennsylvania, where it feeds on the state tree, the Eastern Hemlock.
Other potentially-damaging species, however, won't be impacted as heavily by the cold.
assessed the potential impact of the weather on two other species, the Emerald Ash Borer and Gypsy Moths.
"In my opinion, the larvae over-winter under the tree bark," he
said of the ash borer.
"There is some die-off from thinner bark trees, but a really thick bark, it acts as insulation.
It cuts back come, but are you going to eliminate it?
I don't think so."
As for gypsy moths, the species which is his
area of concentration, Eggen
said the moths lay egg masses at ground level, which allows snow to act as insulation.
"In my entire career, I've seen that one time," he
said of conditions severe enough to cause a large die-off.