Life Histories Of Leafhoppers

Author : Herbert Osborn
Publisher : Forgotten Books
ISBN 13 : 9780282205515
Total Pages : 44 pages
Book Rating : 4.2/5 (55 download)

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Download or read book Life Histories of Leafhoppers of Maine (Classic Reprint) written by Herbert Osborn and published by Forgotten Books. This book was released on 2017-06-17 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Life Histories of Leafhoppers of Maine The most evident effect is the production of numerous spots on the leaves these spots being at first whitish then turning to yellow then to brown and later to black often a black or brown center being surrounded by a reddish or yellow border and verv much resembling a fungus affected spot. This resemblance is SO great that the presence of fungi has often been suspected and efforts made to determine it. In fact I have often been in doubt whether certain spots could be charged to insect attack or fungus and have hesitated to assign the injury to the insect. The presence of eggs in the infested leaves or the demonstra tion of punctures where the hoppers have been sucking the plant cells however will leave no question as to the cause. Prof. Morse of this station who has made careful studies of these injuries states that he has been unable to find fungi present ii connection with the spots except late in the season and when they may very probably have followed as a sequence of the hopper punctures. The egg punctures and the feeding punctures are different enough so that they usually may be distinguished with the aid of a lens and the egg punctures do not as a rule show the color ing which follows the punctures and sucking of sap where the insects feed. The eggs are deposited mainly in the upper part of the leaf sheath or close to the stem on the basal part of the leaf blade. They are forced in beneath the epidermis usually close to the under epidermis but not through it and thus lie in the layer of cells between the two epidermal surfaces of the leaf The result is a transparent spot that is usually quite apparent especially if the leaf is held up to the light. 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.