The woolly adelgid, an invasive pest that infests and eventually destroys hemlock trees, has made one incursion into Eastern Canada and biologists say it's likely to turn up again.
Like the Asian long-horned beetle and the emerald ash-borer, it's a foreign invader that's threatening forests in Eastern Canada and the urban tree canopy.
The first sign of hemlock woolly adelgid is often a white woolly mass at the base of needles of a hemlock tree, says Erin Bullas-Appleton, a plant survey biologist with the Canadian Food Inspection Agency.
The tiny insect, less than 1.5-mm long, produces a wool-like wax to protect its eggs, which are usually deposited on the underside of hemlock needles at the tips of the branches. read more >>