(Salem, OR) -- More than half-a-million acres of trees in Oregon have damage because of drought, bugs and disease. The Oregon Department of Forestry and the U.S. Forest Service released a report that shows drought is weakening trees, especially on the eastern foothills of the Cascades and in Northeast Oregon making them more vulnerable to insects and disease. They believe it's a conservative estimate, because it doesn't take into account root disease that needs to be determined by ground surveys that require more time and personnel.