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Excerpt from Entomological Phases of the 1961 Lodgepole Needle Miner Control Project in Yosemite National Park <p>The principal entomological jobs were (1) to determine when the popu lation reached the proper stage of development for Spraying, and (2) to measure the degree of control attained. This work was done by the Experiment Station, which assisted the Park on the technical phases of the project. <p>Needle miner development during the late larval, pupal, and early adult stages was determined by daily sampling throughout the control area, from.june 6 to August A. Spraying began as planned when about one-quarter of the needle miners reached the adult stage, and When it ended three-quarters of them were in this stage. The target date for starting Spraying was accurately predicted from the sampling data 1 month in advance. <p>About the Publisher <p>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com <p>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.