Gas Treatment for Scale Insects (Classic Reprint) downloadPDF, EPUB, MOBI
Gas Treatment for Scale Insects (Classic Reprint) downloadPDF, EPUB, MOBI

Gas Treatment for Scale Insects (Classic Reprint) by South Africa Horticultural Board

Gas Treatment for Scale Insects (Classic Reprint)
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Author: South Africa Horticultural Board
Number of Pages: 38 pages
Published Date: 27 Sep 2015
Publisher: Forgotten Books
Publication Country: United States
Language: English
ISBN: 9781332237241
File size: 14 Mb
Download Link: gas treatment for scale insects (classic reprint)
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Excerpt from Gas Treatment for Scale Insects To the researches of American investigators and the experiences of her fruit growers is due the credit for great improvements in insecticidal washes now used in many different parts of the world; and to the same source we owe the introduction of hydrocyanic acid gas for the destruction of scale insects in the orchard. The expediency of a gas as an insecticide for scale insects on citrus and other evergreen trees arises from the practical impossibility of reaching all the insects with a liquid on any but small trees; invariably, some escape destruction on large trees and these become the nuclei of new colonies of the insects, which soon become as great a pest as before. The destruction of insects by fumigation with poisonous gases or vapours has long been carried on in greenhouses; but that the process could be economically practised in orchards remained to be demonstrated in California little more than a decade ago. In the first report of the Board of State Horticultural Commissioners of California, published in 1882, unsuccessful experiments with steam to destroy scale insects on tent-covered trees without injury to the foliage are recorded by Commissioner S. F. Chapin. A few years later, Alexander Craw, the present entomologist of the California State Board of Horticulture, and Mr. J. W. Wolfskill carried on many experiments with a number of different gases. The work of these gentlemen impressed D. W. Coquillett, then a special agent of the Division of Entomology of the United States Department of Agriculture, and the three united their efforts. Mr. Coquillett soon discovered the value of hydrocyanic acid gas for the purpose. This happened in the latter part of the year 1886. In a short time, fruit growers began to avail themselves of the discovery; at first slowly, and then more rapidly as improved methods of applying the gas were devised until the "fumigation process" superseded to a very great extent the use of washes on citrus trees in California. 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.

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