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Bezig met laden... Cooperative Economic Insect Report, Vol. 22: April 7, 1972 (Classic Reprint)door United States Department of Agriculture
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Excerpt from Cooperative Economic Insect Report, Vol. 22: April 7, 1972The forests in the intermountain States were plagued by a variety of insects in 1971. As usual bark beetles, particularly the mountain pine beetle, caused more timber damage than any other group of insects. Although overall mountain beetle activity was at the lowest level in several years, a large volume of lodgepole and ponderosa pine trees were killed. The most severe outbreak was on the Targhee National Forest in Idaho. Population of douglas fir beetle in southern Idaho were beginning to subside after remaining at epidemic levels during the last 2 years. The area infested by western spruce budworm increased on the Payette and Boise National Forests, but decreased on the Bridger National Forest. Natural factors were responsible for reducing douglas fir tussock moth populations in southern Idaho.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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. Geen bibliotheekbeschrijvingen gevonden. |
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