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Author:
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ISBN:
Category : Plant diseases
Languages : en
Pages : 534
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Author:
Publisher:
ISBN:
Category : Plant diseases
Languages : en
Pages : 534
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Author: United States. Entomology Research Division
Publisher:
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Category : Agriculture
Languages : en
Pages : 636
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Author:
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ISBN:
Category : Entomology
Languages : en
Pages : 1090
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ISBN:
Category : Research
Languages : en
Pages : 54
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Author:
Publisher: IICA Biblioteca Venezuela
ISBN:
Category :
Languages : en
Pages : 202
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Author: Paul A. Giang
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ISBN:
Category : Insecticides
Languages : en
Pages : 52
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Author: National Agricultural Library (U.S.)
Publisher:
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Category : Agriculture
Languages : en
Pages : 170
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Author: Morris Rockstein
Publisher: Elsevier
ISBN: 032316157X
Category : Science
Languages : en
Pages : 569
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The Physiology of Insecta, Second Edition, Volume VI, is part of a multivolume treatise that brings together the known facts, the controversial material, as well as the many unresolved and unsettled problems of insect physiology. It features chapters written by the outstanding workers in each of a wide range of insect function areas. It is designed to meet a manifest need, which has arisen from the phenomenal increase in research activity on insects, for an authoritative, comprehensive reference work in insect physiology. The book begins with a discussion of the physiology of insect resistance to insecticides. This is followed by separate chapters on the structure and formation of the integument in insects; the physical properties and chemical components of the insect cuticle; and permeability of the insect cuticle. Subsequent chapters cover the organization and evolution of the insect tracheal system; aquatic respiration in insects; and factors affecting insect respiratory rates.
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Category : Insect pests
Languages : en
Pages : 1082
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Author: T. R. Southwood
Publisher: Springer Science & Business Media
ISBN: 9400958099
Category : Science
Languages : en
Pages : 547
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the virtual impossibility of extracting the many different species from a habitat with equal efficiency by a single method (e.g. Nef, 1960). 1.1 Population estimates Population estimates can be classified into a number of different types; the most convenient classification is that adopted by Morris (1955), although he used the terms somewhat differently in a later paper (1960). 1.1.1 Absolute and related estimates The animal numbers may be expressed as a density per unit area of the ground of the habitat. Such estimates are given by nearest neighbour and related techniques (Chapter 2), marking and recapture (Chapter 3), by sampling a known fraction of the habitat (Chapter 4-6) and by removal sampling and random walk techniques (Chapter 7). Absolute population The number of animals per unit area (e.g. hectare, acre). It is almost impossible to construct a budget or to study mortality factors without the conversion of population estimates to absolute figures, for not only do insects often move from the plant to the soil at different developmental stages, but the amount of plant material is itself always changing. The importance of obtaining absolute estimates cannot be overemphasized.
