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Author:
Publisher:
ISBN:
Category : Locusts
Languages : en
Pages : 432
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Author:
Publisher:
ISBN:
Category : Locusts
Languages : en
Pages : 432
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Author:
Publisher:
ISBN:
Category : Locusts
Languages : en
Pages : 404
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Author: Iraq. Mudīrīyat al-Zirāʻah al-ʻĀmmah
Publisher:
ISBN:
Category :
Languages : en
Pages : 254
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Author: S. Krall
Publisher: Birkhäuser
ISBN: 3034892020
Category : Technology & Engineering
Languages : en
Pages : 487
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Book Description
In the late eighties large-scale control operations were carried out to control a major desert locust upsurge in Africa. For the first time since the banning of organochlorine pesticides these operations relied mainly on non-persistent pesticides such as organophosphates and pyrethroids. The amount of pesticides sprayed and the area covered were probably the highest in the history of locust control and raised criticism with respect to efficacy, economic viability and environmental impact. As a consequence, applied research into the problem was intensified, both at the national and the international level, with the goal of finding new and environmentally sound approaches and solutions to locust and grasshopper control. Emphasis was laid on developing new control agents and techniques.
Author: Anti-Locust Research Centre (Great Britain)
Publisher:
ISBN:
Category : Locusts
Languages : en
Pages : 458
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Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 620
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Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 628
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This list includes all serials, printed and processed, received by the Library of the United States Department of Agriculture, on a current basis, as of July 1, 1957. Only dailies or administrative use are omitted. A serial is defined as a publication that is issued either regularly or irregularly over an unspecified period of time. For the purposes of this list, a serial was considered current if it had been received in the Library at any time since January 1954, unless it was known to have ceased.
Author: United States. Department of Agriculture. Library
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 632
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Author: N.C. Stenseth
Publisher: Springer Science & Business Media
ISBN: 9401123381
Category : Science
Languages : en
Pages : 359
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4.1.1 Demographic significance Confined populations grow more rapidly than populations from which dispersal is permitted (Lidicker, 1975; Krebs, 1979; Tamarin et at., 1984), and demography in island populations where dispersal is restricted differs greatly from nearby mainland populations (Lidicker, 1973; Tamarin, 1977, 1978; Gliwicz, 1980), clearly demonstrating the demographic signi ficance of dispersal. The prevalence of dispersal in rapidly expanding populations is held to be the best evidence for presaturation dispersal. Because dispersal reduces the growth rate of source populations, it is generally believed that emigration is not balanced by immigration, and that mortality of emigrants occurs as a result of movement into a 'sink' of unfavourable habitat. If such dispersal is age- or sex-biased, the demo graphy of the population is markedly affected, as a consequence of differ ences in mortality in the dispersive sex or age class. Habitat heterogeneity consequently underlies this interpretation of dispersal and its demographic consequences, although the spatial variability of environments is rarely assessed in dispersal studies.
Author: Augustus Daniel Imms
Publisher: Springer Science & Business Media
ISBN: 9780412152207
Category : Nature
Languages : en
Pages : 954
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Book Description
Band 2.
