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Spatial Tools For Managing The Hemlock Woolly Adelgid In The Southern Appalachians
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Book Synopsis Spatial Tools for Managing the Hemlock Woolly Adelgid in the Southern Appalachians by : Frank Henry Koch (Jr.)
Download or read book Spatial Tools for Managing the Hemlock Woolly Adelgid in the Southern Appalachians written by Frank Henry Koch (Jr.) and published by . This book was released on 2005 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: adelgid, HWA, hemlock, decision tree classification, topographic normalization, forest pest, forest health, infestation risk.
Book Synopsis Spatial Tools for Managing the Hemlock Woolly Adelgid in the Southern Appalachians by :
Download or read book Spatial Tools for Managing the Hemlock Woolly Adelgid in the Southern Appalachians written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Native to Asia, the hemlock woolly adelgid (Adelges tsugae) has recently spread into parts of the southern Appalachian region. This insect pest attacks both native hemlock species (Tsuga canadensis and T. caroliniana), has no natural enemies, and can kill hemlock trees within just a few years. While biological control displays promise for combating the pest, such counter-measures are significantly hampered because neither adelgid nor hemlock distribution patterns have been detailed explicitly. We developed a spatial management system to better target control efforts. The system has two components: (1) a protocol for mapping hemlock stands, and (2) a technique to map areas at risk of imminent hemlock woolly adelgid infestation. To map hemlock stands, we utilized topographically normalized satellite imagery from Great Smoky Mountains National Park. Because hemlocks are difficult to distinguish using just satellite data, we constructed a decision tree classifier that supplemented the imagery with a suite of topographic, environmental, and proximity variables. We then implemented the classifier in a geographic information system and generated hemlock distribution maps. Our final decision tree had 27 terminal nodes and nine variables, with elevation, image band ratios, topographic relative moisture index, and distance to the closest stream among the most important variables. Accuracy assessment--based on field data and aerial photos--of the maps resulting from this tree yielded an overall thematic accuracy of 90% for one study area and 75% accuracy in capturing hemlocks in a second study area. To map areas at risk, we combined known first-year infestation locations from Great Smoky Mountains National Park and the Blue Ridge Parkway with points from uninfested hemlock stands, recording a suite of environmental variables for each point. We applied four different techniques (discriminant analysis, k-nearest neighbor, logistic regression, and decision tree) to gene.
Book Synopsis Spatial, Temporal, and Tri-trophic Distribution of Imidacloprid, Olefin and 5-hydroxy and Their Effect on Hemlock Woolly Adelgid, Adelges Tsugae Annand, (Hemiptera: Adelgidae). by : Carla Irene Coots
Download or read book Spatial, Temporal, and Tri-trophic Distribution of Imidacloprid, Olefin and 5-hydroxy and Their Effect on Hemlock Woolly Adelgid, Adelges Tsugae Annand, (Hemiptera: Adelgidae). written by Carla Irene Coots and published by . This book was released on 2012 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensive mortality of eastern hemlock, Tsuga canadensis (L.) Carrière, resulting from infestation by hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae) (HWA), has occurred throughout the eastern United States. Imidacloprid, a systemic insecticide, is used to control hemlock woolly adelgid. The metabolism of imidacloprid in eastern hemlock produces two metabolites of toxicological interest, olefin and 5-hydroxy. The objectives of this study were to 1.) determine the distribution and persistence of the metabolites in eastern hemlock in the southern Appalachians, 2.) their effect on hemlock woolly adelgid mortality, 3.) assess the tri-trophic movement of these compounds, 4.) evaluate the effects of hemlock woolly adelgid infestation levels on water stress, and 5.) assess the use of near-infrared spectroscopy for predicting imidacloprid concentrations in needle tissue. Imidacloprid and 5-hydroxy concentrations in sap was highest at 12 months post-treatment and in twig and needle tissue was highest at 15 months post-treatment. Imidacloprid was detected through month 36 post-treatment and 5-hydroxy was detected through month 15 post-treatment. Olefin concentrations progressively increased in both sap and twig and needle tissue through month 36 post-treatment. Concentrations of imidacloprid were highest in the bottom stratum of the canopy and lowest in the top stratum. Concentrations of olefin and 5-hydroxy were highest in the top stratum and lowest in the bottom stratum. A significant relationship was found between imidacloprid concentrations > 158 ppb and olefin concentrations > 7 ppb and hemlock woolly adelgid mortality greater than 80% in field studies. In dose-response tests imidacloprid concentrations greater than 131 ppb and olefin concentration greater than 7 ppb were associated with high levels of hemlock woolly adelgid mortality (> 80%). Tri-trophic movement of imidacloprid and olefin was documented through 2 years post-treatment. The highest level of water stress was found in those trees with hemlock woolly adelgid infestation levels greater than 75%. The lowest level of water stress was found in those trees with less than 25% hemlock woolly adelgid infestation levels. Near-infrared spectroscopy results indicate that it can be used to predict concentrations of imidacloprid in needle tissue.
Book Synopsis Eastern Hemlock Forests by : Jeffrey S. Ward
Download or read book Eastern Hemlock Forests written by Jeffrey S. Ward and published by . This book was released on 2004 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impacts of the Hemlock Woolly Adelgid (Adelges Tsugae) on Headwater Stream Wood Loads in the Southern Appalachian Mountains by : Burke Alexander McDade
Download or read book Impacts of the Hemlock Woolly Adelgid (Adelges Tsugae) on Headwater Stream Wood Loads in the Southern Appalachian Mountains written by Burke Alexander McDade and published by . This book was released on 2018 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Standardized Sampling for Detection and Monitoring of Hemlock Woolly Adelgid in Eastern Hemlock Forests by : Scott Costa
Download or read book Standardized Sampling for Detection and Monitoring of Hemlock Woolly Adelgid in Eastern Hemlock Forests written by Scott Costa and published by . This book was released on 2006 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hemlock Ecosystems and Spatial Patterns of Hemlock Woolly Adelgid Infestation in Northwestern North Carolina by : James Radford Graham
Download or read book Hemlock Ecosystems and Spatial Patterns of Hemlock Woolly Adelgid Infestation in Northwestern North Carolina written by James Radford Graham and published by . This book was released on 2008 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecological Forest Management Handbook by : Guy R. Larocque
Download or read book Ecological Forest Management Handbook written by Guy R. Larocque and published by CRC Press. This book was released on 2024-08-21 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Ecological Forest Management Handbook continues to provide forestry professionals and students with basic principles of ecological forest management and their applications at regional and site-specific levels. Thoroughly updated and revised, the handbook addresses numerous topics and explains that ecological forest management is a complex process that requires broad ecological knowledge. It discusses how to develop adaptive management scenarios to harvest resources in a sustainable way and provide ecosystem services and social functions. It includes new studies on ecological indicators, the carbon cycle, and ecosystem simulation models for various forest types: boreal, temperate, and tropical forests. NEW IN THE SECOND EDITION Provides a comprehensive collection of sustainable forest management principles and their applications Covers new ecological indicators that can be applied to address forest environmental issues Includes all types of models: empirical, gap, and process-based models Explains several basic ecological and management concepts in a clear, easy-to- understand manner This handbook is intended for researchers, academics, professionals, and undergraduate and graduate students studying and/or involved in the management of forest ecosystems. Chapter 18 of this book is available for free in PDF format as Open Access from the individual product page at www.taylorfrancis.com. It has been made available under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 license.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis City promenade Deventer, elke stap waard by :
Download or read book City promenade Deventer, elke stap waard written by and published by . This book was released on 1976 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biological Control of Hemlock Woolly Adelgid by :
Download or read book Biological Control of Hemlock Woolly Adelgid written by and published by . This book was released on 2004 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hemlock Woolly Adelgid written by and published by . This book was released on 2005 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling The Effects Of The Hemlock Woolly Adelgid On Carbon Storage In Northern New England Forests by : Jeffrey John Krebs
Download or read book Modeling The Effects Of The Hemlock Woolly Adelgid On Carbon Storage In Northern New England Forests written by Jeffrey John Krebs and published by . This book was released on 2014 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hemlock woolly adelgid (HWA, Adelges tsugae Annand) is an invasive insect that threatens to eradicate native eastern hemlock (Tsuga canadensis (L.) Carr.) across the eastern United States. In southern New England and southern Appalachian forests, HWA-induced hemlock mortality has impacted carbon (C) flux by altering stand age, litter composition, species composition, and coarse woody debris levels. However, no one has examined how total C storage and sequestration may be impacted by these changes. Further, while projections are that HWA will ultimately infest hemlock across its entire geographic range, the majority of studies have been limited to southern New England and Appalachian forests where HWA infestation has been ongoing. To address these gaps, we examined how HWA might alter C dynamics in northern New England forests using the Forest Vegetation Simulator (FVS) and Forest Inventory Analysis (FIA) data to model C storage and successional pathways under three different scenarios: preemptive harvesting of hemlock, HWA-induced hemlock mortality, and a control mimicking natural stand development absent of disturbance. Our 150 year simulation showed that, while all treatments differed significantly in C storage in the short term, there was no significant difference in total C stocks between HWA infestation and presalvage treatments by the 75th year. Compared to the control, both simulated treatments resulted in a significant decrease in total C storage, with greater impacts on stands with higher hemlock densities. However, net C losses over the 150 year simulation were significantly higher for the presalvage scenario, indicating that allowing HWA infestation to progress naturally through a stand may result in the least impact to long-term C sequestration for the region's forests.
Book Synopsis Managing Hemlock Woolly Adelgid in Ornamental Landscapes by : Mark S. McClure
Download or read book Managing Hemlock Woolly Adelgid in Ornamental Landscapes written by Mark S. McClure and published by . This book was released on 1995 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hemlock Woolly Adelgid by : Mark S. McClure
Download or read book Hemlock Woolly Adelgid written by Mark S. McClure and published by . This book was released on 1996 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spatial and Temporal Distribution of Hemlock Woolly Adelgid (hemiptera: Adelgidae) Ovisac and Its Associations with the Environment by : Sunghoon Baek
Download or read book Spatial and Temporal Distribution of Hemlock Woolly Adelgid (hemiptera: Adelgidae) Ovisac and Its Associations with the Environment written by Sunghoon Baek and published by . This book was released on 2015 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biological Control, Host Resistance, and Vegetative Propagation by : Robert Miller Jetton
Download or read book Biological Control, Host Resistance, and Vegetative Propagation written by Robert Miller Jetton and published by . This book was released on 2008 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: biological control, Adelges tsugae, host resistance, hemlock woolly adelgid.
