New results by Forest Ecologist Dave Orwig and others show that hemlock stands invaded by the hemlock woolly adelgid (HWA) experience dramatic reductions in regeneration of new hemlock seedlings, making the insect's destruction difficult to reverse. In extensive surveys of 141 hemlock stands in southern New England, hemlock seedling density declined 71% between 2007 and 2009, while HWA infestation continued