Outbreaks Of The Western Spruce Budworm In The American Northern Rocky Mountain Area From 1922 Through 1971 Classic Reprint

Download or read book Outbreaks of the Western Spruce Budworm in the American Northern Rocky Mountain Area from 1922 Through 1971 (Classic Reprint) written by Philip C. Johnson and published by Forgotten Books. This book was released on 2017-11-08 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Outbreaks of the Western Spruce Budworm in the American Northern Rocky Mountain Area From 1922 Through 1971 Research on the western spruce budworm in recent years has been concerned chiefly with its population dynamics, behavior, genetic characteristics, and chemical control. Few investigations have been directed specifically to its relationship with its host tree species or to the patterns of its outbreaks. Such studies must ultimately be made. Fortunately, much basic information useful for these studies exists in numerous reports that document details of the chronology, geographic distribution, and general severity of many of the budworm outbreaks in the two Forest Service Regions. The general purpose here is to review this information (mostly unpublished) as a background for continuing biological and ecological studies of this important forest insect pest and as an appropriate reference for investigations into its epidemiology. Specifically, our intent here is to (1) consolidate, summarize, and present information about the location, host types, duration, effects, and measures for control applied in past outbreaks; (2) discuss factors thrt appear to relate to the location, duration, and probable effect of budworm outbreaks in the the Regions; and (3) identify problems for further study to more accurately assess the impact possibilities of outbreaks of the budworm in host forests managed for specific uses. 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.