A hemlock tree-destroying pest has turned up in Nova Scotia and don’t count on frosty temperatures to kill the tiny beasts.  The hemlock woolly adelgid attacks eastern hemlock trees by feeding on the nutrient and water storage cells at the base of the trees’ needles, killing them.  Ron Neville, a plant health survey biologist with the Canadian Food Inspection Agency, is investigating how far the pests have spread throughout the province since they were first detected here in mid-July. So far, the hemlock woolly adelgid — or HWA — has been found in five counties: Digby, Yarmouth and Shelburne and a few sites in Annapolis and Queens. “In Digby and Yarmouth County, it’s fairly widespread and less so in Annapolis and Queens,” Neville told CBC’s Information Morning.