The Insect Pest Survey Bulletin Vol 17

Author : United States Bureau Of Entomology
Publisher : Forgotten Books
ISBN 13 : 9780365415138
Total Pages : 22 pages
Book Rating : 4.4/5 (151 download)

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Download or read book The Insect Pest Survey Bulletin, Vol. 20: December 20, 1940 (Classic Reprint) written by United States Bureau Of Entomology and published by Forgotten Books. This book was released on 2018-03-23 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Insect Pest Survey Bulletin, Vol. 20: December 20, 1940 Kentuckv. - Four counties along the Ohio River, in northeastern Kentucky, on record as infested by the European corn borer, were surveyed in 19mo, No infestation was found in 2 of the counties and only a trace of the insect in the other 2. The result was an average of only borer per 100 plaits for the M counties as a group. Indiana. - The European corn borer in Indiana has steadily increased in numbers from 1938 to 19m0. Within a section of 35 counties in the State, which has been intensively surveyed each year, the average number of borers per 100 plants more than doubled from lu.9 in 1938 to 3m.1 in 1939, and again increased in about the same proportion, from 3m.l in 1939 to 77.m in 19mo. Significantincreases from 1939 to 19m0 took place in 26 of the 35 counties surveyed in the 2 years, and the population trend in 8 other counties was in the direction of an increase. In 19u0 populations averaged over 100 borers per 100 plants i each of 9 counties in the eastern part of the State, as compared with 5 counti in this category in 1939. The greatest abundance of the corn borer in Indiana in 19mo was found in Wells County, where there were 3m3.6 larvae per 100 plant the u next most heavily infested counties - Blackford, Jay, Adams, and Allen had populations per 100 plants of 2h6.u, and 23u.5, respectively One of the most important increases from 1939 to 19uo appeared in Wayne County in the southeastern part of the State, where the average number of borers per 100 plants increased from in 1939 to in 19m0. 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.