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Displaying 15,421 - 15,430 of 65,188 Publications- The integrated effects of the many risk factors associated with West Nile virus (WNV) incidence are complex and notwell understood. We studied an array of risk factors in and around Atlanta, GA, that have been shown to be linked with WNV inother locations. This array was comprehensive and included climate and meteorological metrics, vegetation characteristics, landuse / land cover analyses, and socioeconomic factors. Data on mosquito abundance and WNV mosquito infection rates wereobtained for 58 sites and covered 2009-2011, a period following the combined storm water – sewer overflow...AuthorsGraeme Lockaby, Navideh Noori, Wayde Morse, Wayne C. Zipperer, Latif Kalin, Robin Governo, Rajesh Sawant, Matthew RickerKeywordsSourceJournal of Vector EcologyYear2016
- The existing literature suggests that the presence of natural amenities, such as open spaces, can be highly valued and affect economic decisions about where people live and work. This article contributes to previous research by testing this hypothesis using a unique micro-level data set and by examining spatial variations in income levels and housing prices in the presence of natural amenities in a case study of Arizona. Proximity effects are estimated based on a geographic information system road network in which each variable represents the road mile distance from house i to its closest...AuthorsGerman M. Izon, Michael Hand, Daniel W. Mccollum, Jennifer A. Thacher, Robert P. BerrensKeywordsSourceGrowth and Change. 47(4): 461-480.Year2016
- Heterobasidion root disease (previously called annosum, annosus, or Fomes root disease / root rot) is one of the most economically damaging forest diseases in the Northern Hemisphere. Heterobasidion root disease (HRD) in the southeastern U.S. is caused by the pathogen Heterobasidion irregulare, which infects loblolly, longleaf, pitch, shortleaf, slash, Virginia, and white pine; eastern red cedar; and incense cedar. This disease is predominately found in pine plantations after thinning on sites with well-drained sandy soils.AuthorsTyler J. Dreaden, Jason A. Smith, Michelle Cram, David R CoyleSourceSouthern Regional Extension Forestry Fact SheetYear2016
- Factors that influence fungal communities in ambrosia beetle mycangia are poorly understood. The beetle that is responsible for spreading laurel wilt in SE USA, Xyleborus glabratrus, was examined at three sites along a 500 km N-S transect in Florida, each populated by host trees in the Lauraceae. Fungal phenotypes were quantified in mycangia of individual females that were collected from a site in Miami-Dade County (MDC), 25.8N, with swamp bay (Persea palustris), one in Highlands County (HC), 27.9N, with silkbay (P. humulis) and swamp bay and another in Alachua County (AC), 29.8N, with...AuthorsAlina S. Campbell, Randy C. Ploetz, Tyler J. Dreaden, Paul E. Kendra, Wayne S. MontgomeryKeywordsSourceMycologiaYear2016
- In October 2014, a survey for diseases and pests of an emerging fruit crop, avocado (Persea americana) (FAO 2000), was conducted in Southern Shan State of Myanmar (aka Burma). In the Tuanggyi District (1,400 m elevation, 20.5°N 97°E), monocultures of up to 20 ha were observed, whereas in the Ywangan District (1,850 m elevation, 21.2°N 96.4°E), avocado trees were used primarily as shade for the production of coffee (Coffea arabica). In both districts, symptoms of laurel wilt were observed on avocado, but no other tree. Trees exhibited sapwood discoloration, leaf necrosis and defoliation,...AuthorsR. C. Ploetz, Y. Y. Thant, M. A. Hughes, Tyler J. Dreaden, J. L. Konkol, A. T. Kyaw, J. A. Smith, C. L. HarmonSourcePlant DiseaseYear2016
- The U. S. Culture Collection Network was formed in 2012 by a group of culture collection scientists and stakeholders in order to continue the progress established previously through efforts of an ad hock group. The network is supported by a Research Coordination Network grant from the U.S. National Science Foundation (NSF) and has the goals of promoting interaction among collections, encouraging the adoption of best practices, and protecting endangered or orphaned collections. After prior meetings to discuss best practices, shared data, and synergy with genome progrrams, the network held a...AuthorsKevin McCluskey, Anne Alvarez, Rick Bennett, Deepak Bokati, Kyria Boundy-Mills, Daniel Brown, Carolee T. Bull, Michael Coffey, Tyler J. Dreaden, Clifford Duke, Greg Dye, Erin Ehmke, Kellye Eversole, Kristi Fenstermacher, David Geiser, Jessie A. Glaeser, Stephanie Greene, Lisa Gribble, M. Patrick Griffith, Kathryn Hanser, Richard Humber, Barbara W. Johnson, Anthony Kermode, Micah Krichevsky, Matt Laudon, Jan Leach, John Leslie, Meghan May, Ulrich Melcher, David Nobles, Natalia Risso Fonseca, Sara Robinson, Matthew Ryan, James Scott, Carolyn Silflow, Anne Vidaver, Kimberly M. Webb, John E. Wertz, Sara Yentsch, Sarah ZehrSourcePhytopathologyYear2016
- Laurel wilt is a devastating invasive disease of members of the Lauraceae plant family. It is caused by the fungus Raffaelea lauricola, which is a nutritional symbiont of its ambrosia beetle vector, Xyleborus glabratus. In the United States, six Raffaelea spp., in addition to R. lauricola, have been recovered from mycangia of X. glabratus. We compared the response of two laurel wilt suspects, swamp bay (Persea palustris) and redbay (Persea borbonia), to five of these species, another undescribed Raffaelea sp., and R. lauricola. Six weeks after inoculation, only R. lauricola caused significa...AuthorsTyler J. Dreaden, A. S. Campbell, C. A. Gonzalez-Benecke, R. C. Ploetz, J. A. SmithSourceForest PathologyYear2016
- Raffaelea (Ophiostomatales) is a genus of more than 20 ophiostomatoid fungi commonly occurring in symbioses with wood-boring ambrosia beetles. We examined ambrosia beetles and plant hosts in the USA and Taiwan for the presence of these mycosymbionts and found 22 isolates representing known and undescribed lineages in Raffaelea. From 28S rDNA and β-tubulin sequences, we generated a molecular phylogeny of Ophiostomatales and observed morphological features of seven cultures representing undescribed lineages in Raffaelea s. lat. From these analyses, we describe five new species in Raffaelea...AuthorsD. Rabern Simmons, Z. Wilhelm de Beer, Yin-Tse Huang, Craig Bateman, Alina S. Campbell, Tyler J. Dreaden, You Li, Randy C. Ploetz, Adam Black, Hou-Feng Li, Chi-Yu Chen, Michael J. Wingfield, Jiri HulcrKeywordsSourceIMA FungusYear2016
- Pests or pathogens that affect trees have the potential to fundamentally alter forest composition, structure and function. Throughout the last six years, large areas of otherwise healthy ‘ōhi‘a (Metrosideros polymorpha) trees have been dying rapidly (typically within weeks) in lowland tropical wet forest on Hawai‘i Island, USA. This mortality is quite distinct from previous well-documented ‘ōhi‘a dieback episodes driven by cohort senescence. Ceratocystis fimbiata was identified and routinely found associated with rapidly dying individuals of ‘ōhi‘a, Hawai‘i’s most widespread native tree....AuthorsLeif Mortenson, Flint F. Hughes, James B. Friday, Lisa M. Keith, Jomar M. Barbosa, Nathanael J. Friday, Zhanfeng Liu, Travis SowardsKeywordsSourceForest Ecology and Management. 377: 83-92Year2016
- Background: Spatially explicit forest carbon (C) monitoring aids conservation and climate change mitigation eforts, yet few approaches have been developed specifcally for the highly heterogeneous landscapes of oceanic island chains that continue to undergo rapid and extensive forest C change. We developed an approach for rapid mapping of aboveground C density (ACD; units = Mg or metric tons C ha−1) on islands at a spatial resolution of 30 m (0.09 ha) using a combination of cost-efective airborne LiDAR data and full-coverage satellite data. We used the approach to map forest ACD across the...AuthorsGregory P. Asner, Sinan Sousan, David E. Knapp, Paul C. Selmants, Roberta E. Martin, Flint F. Hughes, Christian P. GiardinaKeywordsSourceCarbon Balance and Management. 11(1): 299Year2016