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Excerpt from Ponderosa Pine Mortality Resulting From a Mountain Pine Beetle Outbreak Maximum tree mortality occurred during 1974, 1975, and 1976 and was estimated at about trees per year. Infested trees were noticeably fewer in 1977. The outbreak ended in 1978, when only a few, scattered trees were lightly infested. The mountain pine beetle epidemic in the park was part of a large outbreak that extended about 180 miles from the wyoming-colorado border, southward to the vicinity of Canon City, C010 and encompassed about acres of ponderosa pine type. Lory State Park is 7 miles west of Fort Collins, Colo. The elevation of the forest within the park extends from to feet. While ponderosa pine is the principal type, individual Douglas-firs are scattered in the pine stands and grow in pure stands on north facing slopes. Pine stands on steep, south slopes consist of scattered, open grown trees. 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.
From 1965 to 1978, mountain pine beetles killed 25% of the pines taller than 4.5 feet in a study area in north-central Colorado. Average basal area was reduced from 92 to 58 square feet per acre. Mortality increased with tree diameter up to about 9 inches d.b.h. Larger trees appeared to be killed at random. Mortality was directly related to number of trees per acre and presence of dwarf mistletoe, but not to site index, elevation, and percent Douglas-fir in the stand.
Excerpt from Performance of Three Mountain Pine Beetle Damage Models Compared to Actual Outbreak Histories Forest inventory data were obtained from the Northern Region, Forest Service, us. Department of Agriculture. Actual mortality caused by mpb was computed and then compared to the mortality predicted by each mpb model. Within the Northern Region, 58 stands with inventory data were located from various forests and research studies (table Data used in our study came from four sources. 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.
Excerpt from Insect-Caused Mortality in Relation to Methods of Cutting in Ponderosa Pine on the Blacks Mountain Experimental Forest For this reason, entomologists began collecting records of mortality on the plots from the start of the tests. These records were taken yearly, once the plots were cut, from 1939 through 195a. Recently, the mortality records were analyzed by the Station's Division of Forest Insect Research. The purpose was to determine (1) if insect-caused losses were correlated with method of cutting; and (2) if differences in losses by method were great enough to warrant continuing annual measurements. This report contains an analysis of the mortality data obtained, and summarizes the results and conclusions derived therefrom. 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.