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Excerpt from Ohia Forest Decline: Its Spread and Severity in Hawaii Thousands of acres of ohia and ohia-koa rain for est on the windward slopes of the island of Hawaii are suffering a severe epidemic. A high proportion of the trees have died on thousands of acres, and the forest decimation is continuing. The epidemic is affecting all ages of trees and forests on widely different sites. The specific cause (or causes) of the forest decline is not known, although both disease organisms and insects have been found associated with the dead and dying trees. Scientists from several agencies are using a multi disciplinary approach to investigate the problem. This paper deals with the determination of the extent, rate of spread, and severity of the forest decline. 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.
Ohia forest decline-its severity and rate of spread-was studied by aerial photographic techniques on a 197,000-acre (80,000-ha) portion of the island of Hawaii. In 1954, only 300 acres (121 ha) showed signs of severe decline; by 1972, the acreage of severely affected forest had increased to 85,200 acres (34,480 ha). Rate of decline and current severity were related to mean annual precipitation and to elevation. The epidemic is continuing. Some forests on other Hawaiian islands also display decline symptoms.