Beetles from B.C. settling in Nova Scotia, taking up the fight to rescue hemlocks – Halifax

The offspring of beetles imported from British Columbia are ready to take up the fight against an invasive insect that is killing hemlock trees in Nova Scotia.

Last fall and spring, about 5,000 Laricobius nigrinus beetles — affectionately called Lari by scientists — made an overnight journey from the West Coast.

Lucas Roscoe, research scientist with the Canadian Forest Service, says in the fight against the woolly adelgid that is destroying swaths of hemlock trees in Nova Scotia, the first step was to make sure the Lari beetle can survive a Nova Scotia winter.

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The one-to-two-millimetre black flying beetles were released across six sites in Nova Scotia that had the woolly adelgids.

In one of the sites, scientists placed cages of imported beetles and about 60 per cent of them were able to survive the winter in Nova Scotia, which Roscoe says is an encouraging rate.

He says the woolly adelgid was first seen in southwestern Nova Scotia in 2017 and the peppercorn-sized insect, aided by climate change, has since spread north.

This report by The Canadian Press was first published Nov. 13, 2024.