A destructive invasive beetle that destroys ash trees continues to spread in New York, leapfrogging the Adirondacks and appearing near the Canadian border, according to the state Department of Environmental Conservation.Emerald ash borers were found last month in special traps set up by DEC in St. Lawrence and Franklin counties, said Commissioner Basil Seggos.The traps were "within a few miles of the Canadian border and may represent an expansion of Canadian infestations into New York," according to DEC.