Excerpt from Forest Insect and Disease Conditions in Alaska in 1978 Hemlock dwarf mistletoe, Sirococ cus shoot blight, and needle rust of white and black spruce continue to be the most damaging tree diseases in Alaska. A total of hectares of white spruce were lightly infected and hectares were heavily infected by needle rust along the Porcupine and Yukon Rivers in interior Alaska. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.