Download or read book Studies of the Effect of Temperature and Precipitation Upon a Grasshopper Population as Shown in the Outbreaks of North Dakota written by Allen Thomas Stewart Lockwood and published by . This book was released on 1926 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Production Research Report written by United States. Department of Agriculture and published by . This book was released on 1957 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Replacement of One Grasshopper Species by Another written by Claude Carl Wakeland and published by . This book was released on 1961 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Commencement written by University of Minnesota and published by . This book was released on 1926 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Avian Predation on Grasshopper Populations in North Dakota Grasslands written by Ada Christine Fowler and published by . This book was released on 1990 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grasshoppers written by John Robert Parker and published by . This book was released on 1964 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This bulletin on grasshoppers is intended to help county agricultural agents, entomologists, and other agricultural leaders. It presents in everyday language the more important facts about grasshoppers. It describes the damage they do; it tells what different species look like, how they develop, and where and how they live; and it explains how outbreaks occur."--Page 2.
Download or read book Four Essays Concerning Grasshopper Orthoptera Acrididae Outbreaks written by Douglas Isaac Smith and published by . This book was released on 2016 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: These four studies were conducted to assess several questions enveloping rangeland grasshopper (Orthoptera: Acrididae) outbreaks (classified as densities >9.6 grasshoppers/m2) in eastern Wyoming. Specifically, these studies investigated 1) effects on non-target arthropods following diflubenzuron Reduced Agent and Area Treatments (RAATs) to suppress grasshopper outbreaks on native rangelands; 2) the use of remote sensing (and derived from it vegetative indices of NDVI or SAVI) to detect rangeland grasshopper outbreaks; 3) the hypothesis that a three-state Discrete Time Markov Chain (DTMC) using grasshopper species (instead of assemblages) will yield greater probabilities of predicting future grasshopper outbreaks than a two-state DTMC and to test ecological associations (elevation, slope, soil type and precipitation) of grasshopper outbreaks to compare results to previous studies using Geographic Information Systems (GIS); 4) whether particular grasshopper species associations are common during outbreaks that last >3 years. The results of this first investigation suggest nominal, if any, effects to non-target arthropods with the treatment methods described. The results of the second study report problematic techniques, ecological assumptions, and technological limitations in using remote sensing in this context of rangeland herbivory. Third, the Markov Chain analysis revealed that density-dependent factors may not play a role in population regulation for all grasshopper outbreaks and ecological analysis revealed that 70% of all grasshopper outbreaks recorded during the period of 1994-2011 occurred during above normal annual precipitation. Elevation, soil orders and vegetation type were also ecologically significant factors for grasshopper outbreaks in Wyoming. The fourth investigation revealed associations of certain grasshopper species with over 80% confidence.
Download or read book Biology of Grasshoppers written by R. F. Chapman and published by John Wiley & Sons. This book was released on 1991-01-16 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Novel Aspects of Insect-Plant Interactions Edited by Pedro Barbosa and Deborah Letourneau This volume represents the forefront of two rapidly advancing areas of ecology: three-trophic-level interactions and the interdisciplinary field of chemical ecology The book focuses on the role of microorganisms as mediators of interactions between insects and plants, providing critical appraisal of studies and suggesting ways to integrate competing hypotheses of insect-plant dynamics. 1988 (0 471-83276-6) 362 pp. Arthropod Biological Control Agents and Pesticides Brian A. Croft Examining the effects of pesticides on predators and parasites and exploring methods for reducing negative impacts of pesticide use, this book focuses on the interaction of pesticides with entomophagous arthropods. It surveys the history of research in the field and discusses susceptibility assessment, lethal, sublethal, and ecological effects of pesticides, and selectivity, resistance, and resistance management. 1990 (0 471-81975-1) 723 pp. Lepidopteran Anatomy, John Eaton This single-source treatment on the anatomy of Lepidoptera provides a detailed exposition of its anatomy plus all its life stages, including the larva and adult forms of the exoskeleton, musculature, organ systems, and specialized structures. As the only thorough examination of the morphology of this insect group, it is an essential acquisition for entomologists, morphologists, and insect physiologists. 1988 (1-05862-9) 257 pp. Integrated Pest Management Systems and Cotton Production Edited by Ray Frisbie, Kamal El-Zik, and L. Ted Wilson The most complete and authoritative work available on the subject, this book brings together information on integrated pest management strategies that are applicable to cotton. It addresses economic, agronomic, and biological factors of pest management and focuses on plant resistance to pests and the genetic rationale for improving plant health. 1989 (0 471-81782-1) 437 pp.
Download or read book Effects of Additional Precipitation on Agricultural Production the Environment the Economy and Human Society in South Dakota written by South Dakota Agricultural Experiment Station and published by . This book was released on 1973 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Added Rainfall During the Growing Season in North Dakota written by and published by . This book was released on 1974 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Supplement to Farming in the Great Plains written by August Ludwig Hormay and published by . This book was released on 1960 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grasshoppers and Grassland Health written by Jeffrey Lockwood and published by Springer Science & Business Media. This book was released on 2000-09-30 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Grasshopper Outbreaks During the Last 100 Years written by John Robert Parker and published by . This book was released on 1940 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Weather Variation on Economic Results from Grasshopper Control Tactics in Chad written by Allah Ditta Sheikh and published by . This book was released on 1991 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agricultural production in the Sahelian region of Africa is among the lowest in the world. Cyclical infestations of locusts and grasshoppers have contributed to this low productivity. The infestations appear to be triggered by heavy rainfall at the beginning of a crop season after extended drought. Because locusts and grasshoppers are migratory, their control on a local and farm by farm basis is difficult. To combat the problem of periodic outbreaks USAID has provided direct assistance through aerial spraying of grasshoppers in a number of African countries.' This includes a control program in the north African country of Chad in 1987. From the beginning concern arose as to when it is economically desirable to control grasshoppers. The International Plant Protection Center (IPPC) at Oregon State University was awarded a contract for economic evaluation of spraying in Chad which included development of a grasshopper crop loss simulation model (GHLSIM) driven by climatic factors for grasshopper and crop growth. GHLSIM's posterior analysis of the 1987 anti-grasshopper campaign produced results with a wide range of B/C ratios across the 13 sites which were evaluated. The B/C ratios ranged from 0 to 6.9. To test GHLSIM's use beyond weather conditions of a single year (1987), a Monte Carlo simulation technique was used to generate long term (100 year) rainfall patterns at selected sites and a series of expected benefits generated. The effect of rainfall variability upon economic benefits was assessed. So also were changes in grasshopper population densities and output prices. Results are presented graphically under a number of such conditions to understand the biophysical relationships among grasshoppers, crop, natural vegetation and rainfall as modeled by GHLSIM. The model is sensitive to within season and to some extent between season weather variation. Rainfall appears to be the dominant variable controlling crop production, regardless of grasshopper densities. When weather is the overriding factor, changes in grasshopper density levels do not play a dominant role in affecting B/C ratios. When weather is not a constraint for crop production, grasshopper density changes can affect benefits significantly. In its present form the GHLSIM model cannot be used as an early warning indicator. While the model appears to predict crop production quite well, model refinement which will change the qualitative prediction of grasshopper populations to a quantitative one throughout a crop season is still needed. When this is completed and both the GHLCROPS and GHLOSE submodels performance are validated against field observations, the GHLSIM model can be used as an early warning predictor. With these accomplishments GHLSIM can then be considered for use in the public policy arena for assessing what areas to spray, when and what distributional effects may be involved.
Download or read book Tests with Sprays for Controlling Grasshoppers on Farm Lands in North Dakota and Texas 1950 51 written by Robert Leslie Shotwell and published by . This book was released on 1952 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lower Sheyenne River Basin written by Armand Bauer and published by . This book was released on 1974 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biology and Ecology of North Dakota Grasshoppers written by Gregory Benedict Mulkern and published by . This book was released on 1964 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
