Effect of Light Traps on Hornworm Populations in Large Areas (Classic Reprint) PDF Download
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Author: U. S. Department Of Agriculture Publisher: Forgotten Books ISBN: 9781527834569 Category : Business & Economics Languages : en Pages : 28
Book Description
Excerpt from Effect of Light Traps on Hornworm Populations in Large Areas The influence or migrant moths moving into the trapped area in obscuring the total effect Of the trapping operations cannot be fully assessed on the asis of data now available. The data suggest, however, that some additional reduction in hornworm moth populations above that achieved in this experiment could be expected, if traps of a like density were Operating in an area of sufficient size to eliminate the influence of migrant moths. To appraise the significance of moth migration, it will be necessary to conduct experiments in larger areas or on the total population in an isolated situation such as an island. 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. Department Of Agriculture Publisher: Forgotten Books ISBN: 9781527834569 Category : Business & Economics Languages : en Pages : 28
Book Description
Excerpt from Effect of Light Traps on Hornworm Populations in Large Areas The influence or migrant moths moving into the trapped area in obscuring the total effect Of the trapping operations cannot be fully assessed on the asis of data now available. The data suggest, however, that some additional reduction in hornworm moth populations above that achieved in this experiment could be expected, if traps of a like density were Operating in an area of sufficient size to eliminate the influence of migrant moths. To appraise the significance of moth migration, it will be necessary to conduct experiments in larger areas or on the total population in an isolated situation such as an island. 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: H. M. Graham Publisher: Forgotten Books ISBN: 9780260682970 Category : Languages : en Pages : 34
Book Description
Excerpt from Effects of a High Density of Blacklight Traps on Corn Earworm Population in Corn The purpose of our study was to determine what effect a rather dense installation of blacklight traps might have on corn earworm populations in a semi-isolated cornfield. 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: Michael J. Samways Publisher: Oxford University Press ISBN: 0199298238 Category : Nature Languages : en Pages : 458
Book Description
This handbook outlines the main methods and techniques, both modern and traditional, used to measure insect diversity. With the growing relevance of insect conservation in nature, this guide should assist students in understanding a complicated field.
Author: William J. Bell Publisher: Springer ISBN: 1489933689 Category : Science Languages : en Pages : 523
Book Description
Our objective in compiling a series of chapters on the chemical ecology of insects has been to delineate the major concepts of this discipline. The fine line between presenting a few topics in great detail or many topics in veneer has been carefully drawn, such that the book contains sufficient diversity to cover the field and a few topics in some depth. After the reader has penetrated the crust of what has been learned about chemical ecology of insects, the deficiencies in our understanding of this field should become evident. These deficiencies, to which no chapter topic is immune, indicate the youthful state of chemical ecology and the need for further investigations, especially those with potential for integrating elements that are presently isolated from each other. At the outset of this volume it becomes evident that, although we are beginning to decipher how receptor cells work, virtually nothing is known of how sensory information is coded to become relevant to the insect and to control the behavior of the insect. This problem is exacerbated by the state of our knowledge of how chemicals are distributed in nature, especially in complex habitats. And finally, we have been unable to understand the significance of orientation pathways of insects, in part because of the two previous problems: orientation seems to depend on patterns of distri bution of chemicals, the coding of these patterns by the central nervous system, and the generation of motor output based on the resulting motor commands.
Author: M.L. Flint Publisher: Springer Science & Business Media ISBN: 1461592127 Category : Science Languages : en Pages : 247
Book Description
Integrated control of pests was practiced early in this century, well before anyone thought to call it "integrated control" or, still later, "integrated pest management" (IPM), which is the subject of this book by Mary Louise Flint and the late Robert van den Bosch. USDA entomologists W. D. Hunter and B. R. Coad recommended the same principles in 1923, for example, for the control of boll weevil on cotton in the United States. In that program, selected pest-tolerant varieties of cotton and residue destruction were the primary means of control, with insecticides consid ered supplementary and to be used only when a measured incidence of weevil damage occurred. Likewise, plant pathologists had also developed disease management programs incorporating varietal selection and cul tural procedures, along with minimal use of the early fungicides, such as Bordeaux mixture. These and other methods were practiced well before modern chemical control technology had developed. Use of chemical pesticides expanded greatly in this century, at first slowly and then, following the launching of DDT as a broadly successful insecticide, with rapidly increasing momentum. In 1979, the President's Council on Environmental Quality reported that production of synthetic organic pesticides had increased from less than half a million pounds in 1951 to about 1.4 billion pounds-or about 3000 times as much-in 1977.
Author: E. J. Milner-Gulland Publisher: OUP Oxford ISBN: 0191523909 Category : Science Languages : en Pages : 328
Book Description
The relentless exploitation and unsustainable use of wildlife, whether for food, medicine or other uses, is a key concern for conservationists worldwide. Indeed, wildlife conservation and sustainable use have recently become centrepieces in conservation and development research. Assessment, interpretation and ultimate action in a scientific study of exploited species must consider numerous factors: from the biology, habitat requirements and population dynamics of the species in question to the relationships that people have with their environment and the species within it. Any long-term management plan must ensure that people and wildlife can coexist - otherwise it is doomed to failure. Conservation and Sustainable Use provides a practical and integrated approach to carrying out research on the conservation of exploited species. It is relevant to both tropical and temperate biomes and is applicable to all exploited species, including mammals, fish and plants. It describes both the practical (field) and theoretical (modelling) techniques for obtaining and interpreting information, integrating biological, social, economic and institutional analyses. It also demonstrates how to translate information into effective action through appropriate interventions, from legislation to changing people's attitudes. This is the first time that all these issues have been covered together in a single, practically-orientated volume. This book will be essential reading for graduate level students and researchers in conservation biology, human ecology, sociology and resource economics. It will also provide an important reference for anyone who is interested in carrying out a scientifically-based conservation programme for an exploited species, including field biologists, wildlife managers and practitioners in the fields of conservation and international development.
Author: U. S. Department Of Agriculture
Author: U. S. Department Of Agriculture
Author: 
Author: F. R. Lawson
Author: H. M. Graham
Author: Dave Winter
Author: Michael J. Samways
Author: Ann E. Hajek
Author: William J. Bell
Author: M.L. Flint
Author: E. J. Milner-Gulland