Bulletin Volume 41

Bulletin Volume 41

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...in fighting some species of Bucking insect. SOLUBLE OILS. The principle of effectiveness of the above described insecticide is the fact that the kerosene is rendered practically soluble in cold water. It is a commonly known fact that pure kerosene is one of the most powerful contact insecticides in existence, but its use is limited owing to the fact that when used in the crude form it not only kills the insects in question but also kills the tree or shrub upon which it is sprayed. To invent some means, therefore, by which an oil, drastic in its action as is kerosene, may be used as a spray without damage to the plant, has been the problem upon which chemists and entomologists have long worked. Hitherto this has remained unsolved, but in recent years there have appeared upon the market preparations under the name of "Soluble Oils" for which the inventors claimed many things, the most important among which were the claim that these preparations are rendered soluble in cold water, and at the same time can be sprayed without injury to trees and with fatal results to scale insects. These-claims were regarded for a long time as preposterous by the public in general and entomologists in particular, but frequent reports of successful use came in from fruit growers, and then the experiment stations throughout the country began to run series of experiments with many of these preparations. The results were surprising in the extreme, and it has not taken long to establish the fact, supported by rigid investigation, that there are "soluble" oils upon the market, and that they can be used without damage to the trees or shrubs, and with effective results against the San Jose Scale an other such insects. During the writer's connection...show more

Product details

  • Paperback | 74 pages
  • 189 x 246 x 4mm | 150g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236938534
  • 9781236938534