Review of Forage Losses Caused by Rangeland Grasshoppers PDF Download
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Author: George B. Hewitt Publisher: ISBN: Category : Forage Languages : en Pages : 24
Book Description
Research studies on forage losses by rangeland grasshoppers have been reviewed. Factors that relate to forage losses are discussed (food preference, density, habitat, grazing influence, weather, human influence, and physiological influences). A listing is given for the most destructive rangeland grasshopper species, their area of potential damage, and their preferred food plants. Estimated amounts of forage lost are listed for populations and certain economic species. A means of predicting forage losses once certain information is obtained is suggested.
Author: George B. Hewitt Publisher: ISBN: Category : Forage Languages : en Pages : 24
Book Description
Research studies on forage losses by rangeland grasshoppers have been reviewed. Factors that relate to forage losses are discussed (food preference, density, habitat, grazing influence, weather, human influence, and physiological influences). A listing is given for the most destructive rangeland grasshopper species, their area of potential damage, and their preferred food plants. Estimated amounts of forage lost are listed for populations and certain economic species. A means of predicting forage losses once certain information is obtained is suggested.
Author: George B. Hewitt Publisher: ISBN: Category : Forage Languages : en Pages : 48
Book Description
Research studies on forage losses by rangeland grasshoppers have been reviewed. Factors that relate to forage losses are discussed (food preference, density, habitat, grazing influence, weather, human influence, and physiological influences). A listing is given for the most destructive rangeland grasshopper species, their area of potential damage, and their preferred food plants. Estimated amounts of forage lost are listed for populations and certain economic species. A means of predicting forage losses once certain information is obtained is suggested.
Author: Jeffrey A. Lockwood Publisher: Springer Science & Business Media ISBN: 9401143374 Category : Science Languages : en Pages : 236
Book Description
Acridids (grasshoppers and locusts) can range from being rare curiosities to abundant menaces. Some are threatened with extinction and become subjects of intensive conservation efforts, while others are devastating pests and become the objects of massive control programmes. Even within a species, there are times when the animal is so abundant that its crushed masses cause the wheels of trains to skid (the Rocky Mountain grasshopper, Melanoplus spretus Walsh in western North America in the 1860s and I 870s), while at other times the animal is alarmingly scarce (the Rocky Mountain grasshopper went extinct in the early 1900s). Why are there these extremes in one insect family, and even in a single species? The NATO workshop examined this paradox and its implications for Environmental Security, which must address both the elements of land use (agricultural production and pest management) and conservation of biodiversity. The reconciliation of these objectives clearly demands a critical assessment of current knowledge and policies, identification of future research, and close working relationships among scientists. Insects can present two clear faces, as well as the intervening gradation. These extremes require us to respond in two ways: conservation of scarce species and suppression of abundant (harmful) species. But perhaps most important, these opposite poles also provide the opportunity for an exchange of information and insight.
Author: George B. Hewitt
Author: George B. Hewitt
Author: Ellen Kay Miller
Author: George B. Hewitt
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Author: United States. Bureau of Land Management
Author: Jeffrey A. Lockwood