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Bezig met laden... Cooperative Economic Insect Report, Vol. 23: February 9, 1973 (Classic Reprint)door United States Department of Agriculture
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Excerpt from Cooperative Economic Insect Report, Vol. 23: February 9, 1973 The 1972 European corn borer survey was conducted during late summer and early fall. The survey is designed to measure the fall populations of European corn borer larvae and is conducted during a favorable time to include a high percentage of late instars, wherever possible. Except for some minor differences in compiling data, the accepted survey methods were followed in all cases. The survey was continued on a district basis whenever possible in 1972. A district is usually a group of counties within a State, in most cases based on Crop Reporting Districts. 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. Geen bibliotheekbeschrijvingen gevonden. |
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