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Author: Charles Howard Richardson Publisher: Forgotten Books ISBN: 9780260897107 Category : Science Languages : en Pages : 22
Book Description
Excerpt from Studies on Contact Insecticides In' the present state of knowledge of insecticides, it is doubtful whether one may safely draw any far-reaching conclusions as to the relation between the physical properties Of compounds and their toxicity. Any large and varied series Of toxic compounds will Show differences in toxicity which can not be correlated with molecular weight, volatility, solubility, ionization, permeability, or other properties. 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.
Author: Charles Howard Richardson Publisher: Forgotten Books ISBN: 9781528191562 Category : Science Languages : en Pages : 24
Book Description
Excerpt from Studies on Contact Insecticides In' the present state of knowledge of insecticides, it is doubtful whether one may safely draw any far-reaching conclusions as to the relation between the physical properties Of compounds and their toxicity. Any large and varied series Of toxic compounds will Show differences in toxicity which can not be correlated with molecular weight, volatility, solubility, ionization, permeability, or other properties. 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.
Author: Roy Dean Speirs Publisher: Forgotten Books ISBN: 9780260543738 Category : House & Home Languages : en Pages : 24
Book Description
Excerpt from Contact, Residue, and Vapor Toxicity of New Insecticides to Stored-Product Insects, Vol. 3 The room in which the towers were located was maintained at a temperature of 24 to 27 C during all tests. Four glass petri dishes of each insect species were exposed in each of four towers. Each petri dish contained 10 insects. 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.
Author: Roy Dean Speirs Publisher: Forgotten Books ISBN: 9780365789208 Category : House & Home Languages : en Pages : 38
Book Description
Excerpt from Contact, Residue, and Vapor Toxicity of New Insecticides to Stored-Product Insects The 22 compounds evaluated in this report were the first compounds evaluated in this program. The compounds tested were as follows y. 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.
Author: J. K. Haywood Publisher: ISBN: 9781332265961 Category : Science Languages : en Pages : 72
Book Description
Excerpt from Insecticide Studies: I, Pyrethrum Powders Containing Poisonous Metals; II, a Compilation of Analyses of Insecticides and Fungicides; III, State Laws Governing the Composition and Sale Insecticides In the course of a recent examination of a large number of miscellaneous insecticides it was observed that a number of pyrethrum powders contained lead chromate. Those powders arc sold under such names as Persian Insect Powder, Dalmatian Insect Powder, Buhach, and Pyrethrum, and are colored yellow because there seems to be a popular demand for this grade of goods, the public apparently believing that the preparation must he bright yellow in order to kill insects. As a matter of fact pure pyrethrum, which is composed of the ground flower heads of Pyrethrum roseum and Pyrethrum cinerariaesfolium usually possesses a light yellow color, but never the brio-ht. intense yellow color given to it by lead chromate. As lead chromate is known to be poisonous, it would appear that it i a very reprehensible practice to add it to pyrethrum powders, since they are often blown about living rooms with a bellows to kill insects, and are consequently inhaled by human beings. Besides this, pyrethrum is always advertised to be harmless to human beings, which it is when pure, but ceases to be so when it has been mixed with lead chromate or other yellow colored chromates. In view of the above facts it was deemed advisable to examine the pyrethrum powders sold upon the American market to discover which of them contain yellow chromates and at the same time to cite eases of poisoning by chromates to substantiate the claim that any of the yellow chromates that might be used for this purpose, and especially lead chromato. are poisonous to human beings. The facts which have been collected on these points are embodied in the following report: Cases Of Poisoning By Lead And Other Chromates. Since it is not generally known that many pyrethrum powders contain lead chromate, it doubtless often happens that physicians are much puzzled as to the cause of the illness of persons who have been exposed to the action of such powders. 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."
Author: Roy Dean Speirs Publisher: Forgotten Books ISBN: 9780428795597 Category : Science Languages : en Pages : 48
Book Description
Excerpt from Contact, Residue, and Vapor Toxicity of New Insecticides to Stored-Product Insects, II The 68 candidate insecticides evaluated in this report were the second group of materials evaluated in this program. Tests on the first group of 22 compounds were reported in mbb 546 in The candidate insecticides tested since that time and their chemical names are given in table 1. 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.
Author: U. S. Entomology Research Division Publisher: Forgotten Books ISBN: 9780266861355 Category : Business & Economics Languages : en Pages : 22
Book Description
Excerpt from Granular Insecticides: Research Developments and Uses More and more farmers today are turning to granular insecticides to protect their crops against certain insect pests. Federally controlled eradication and control programs against the imported fire ant and other soil-inhabiting insects now rely almost exclusively on granular formulations. The fact that insecticides in granular form, under certain conditions, are more effective than insecticides in spray or dust form is one of the reasons that dictate these choices. To get the maximum benefit possible from each ounce of insecticide used in the eradication and control programs, scientists of the Agricultural Research Service continually investigate the physical and chemi cal makeup of granular formulations. These investiga tions have established the fact that standardization of granular insecticides for certain specific uses saves time and money. Other facts about granular insecticides and their use to protect fruit, vegetable, and forage crops, animals and man come from other ars research and State research in many parts of the United States. 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.
Author: U. S. Agricultural Research Service Publisher: Forgotten Books ISBN: 9780364820780 Category : Business & Economics Languages : en Pages : 32
Book Description
Excerpt from Research on Controlling Insects Without Conventional Insecticides: October 1963; Ars 22-85 Since then many parts of the world have been searched for parasites and predators, and a wide range of insects has been screened for parasitic and predatory species. Many insect families, genera, and species have been systematically tested against certain pests. 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.
Author: Charles Howard Richardson
Author: Charles Howard Richardson
Author: Charles Howard Richardson
Author: Roy Dean Speirs
Author: Martin Sherman
Author: Roy Dean Speirs
Author: J. K. Haywood
Author: Roy Dean Speirs
Author: U. S. Entomology Research Division
Author: New Hampshire Agricultural Experiment Station
Author: U. S. Agricultural Research Service