Search results for: Lori G. Eckhardt

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Sapwood growth and tolerance of Pinus taeda trees to Leptographium terebrantis inoculation

John K. Mensah, Pratima Devkota, Lori G. Eckhardt, Stephen Woodward

Leptographium terebrantis is an opportunistic root pathogen that has been implicated as a contributing factor of Pinus taeda decline and mortality over the past several decades in central parts of Alabama and Georgia, USA. We assessed the potential of L. terebrantis to initiate crown thinning in young P. taeda trees and hypothesized that L. terebrantis infestation will impose moisture stress on foliage,...

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Understanding relationship between the wood quality parameters and susceptibility of Pinus taeda to pine decline

Charles Essien, Pratima Devkota, Brian K. Via, Lori G. Eckhardt

European Journal of Wood and Wood Products > 2019 > 77 > 6 > 1117-1124

Pinus taeda (loblolly pine) is one of the ecologically and economically important conifer species in the southeastern USA. However, a disease decline syndrome, southern pine decline (SPD), associated with beetle-vectored root-infecting fungi, has emerged as one of the major challenges confronting loblolly pine production in this part of the country. Although several studies have been conducted to...

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Intraspecific response of Pinus taeda L. to Grosmannia huntii and Leptographium terebrantis infection

Pratima Devkota, Lori G. Eckhardt, A. Lehtijärvi

Forest Pathology > 49 > 3 > n/a - n/a

We examined intraspecific and inter‐year variation in tolerance of Pinus taeda to two ophiostomatoid fungi, Leptographium terebrantis and Grosmannia huntii. Containerized seedlings of P. taeda from 27, 32, 17 and 23 different elite genetic families were artificially inoculated with L. terebrantis and G. huntii in years 2013, 2014, 2016 and 2017, respectively. Six connector families were inoculated...

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Pinus taeda L. response to differential inoculum density of Leptographium terebrantis colonized toothpicks

Pratima Devkota, John K. Mensah, Ryan L. Nadel, George Matusick, more

Forest Pathology > 49 > 1 > n/a - n/a

Bark beetle‐vectored ophiostomatoid fungi, Leptographium terebrantis, is inoculated on the roots and lower stems of stressed Pinus species during the feeding activity of bark beetle. To determine the exact host response following inoculation, it is critical to challenge the host with a realistic amount of fungal inoculum. Thus, we designed a series of stepwise experiments using L. terebrantis colonized...

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Variation in pathogenicity of different Leptographium terebrantis isolates to Pinus taeda L.

Pratima Devkota, Lori G. Eckhardt

Forest Pathology > 48 > 6 > n/a - n/a

Variation in the pathogenicity of 42 isolates of Leptographium terebrantis to Pinus taeda was examined. Stems of 1‐year‐old P. taeda seedlings were artificially inoculated with the fungal isolates. Eight weeks following inoculation, L. terebrantis isolates caused dark necrotic lesion and sapwood occlusion in the seedling stems. The fungal isolates varied in their ability to cause lesion and tissue...

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Multivariate modeling of acoustomechanical response of 14-year-old suppressed loblolly pine (Pinus taeda) to variation in wood chemistry, microfibril angle and density

Charles Essien, Brian K. Via, Qingzheng Cheng, Thomas Gallagher, more

Wood Science and Technology > 2017 > 51 > 3 > 475-492

The polymeric angle and concentration within the S₂ layer of the softwood fiber cell wall are very critical for molecular and microscopic properties that influence strength, stiffness and acoustic velocity of wood at the macroscopic level. The main objective of this study was to elucidate the effect of cellulose, hemicellulose, lignin, microfibril angle and density on acoustic velocity and material...

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Comparative behavior of root pathogens in stems and roots of southeastern Pinus species

George Matusick, Ryan L. Nadel, David M. Walker, Mohammad J. Hossain, more

Fungal Biology > 2016 > 120 > 4 > 471-480

Root diseases are expected to become a greater threat to trees in the future due to accidental pathogen introductions and predicted climate changes, thus there is a need for accurate and efficient pathogenicity tests. For many root pathogens, these tests have been conducted in stems instead of roots. It, however, remains unclear whether stem and root inoculations are comparable for most fungal species...

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Hyperspectral interferometry: Sizing microscale surface features in the pine bark beetle

James M. Beach, James L. Uertz, Lori G. Eckhardt

Microscopy Research and Technique > 78 > 10 > 873 - 885

A new method of interferometry employing a Fabry–Perot etalon model was used to locate and size microscale features on the surface of the pine bark beetle. Oscillations in the reflected light spectrum, caused by self‐interference of light reflecting from surfaces of foreleg setae and spores on the elytrum, were recorded using white light hyperspectral microscopy. By making the assumption that pairs...

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Impact of cogongrass management strategies on generalist predators in cogongrass‐infested longleaf pine plantations

Sallie M Sells, David W Held, Stephen F Enloe, Nancy J Loewenstein, more

Pest Management Science > 71 > 3 > 478 - 484

BACKGROUNDCogongrass (Imperata cylindrica Beav.) is an aggressive, invasive weed with a global distribution. In North America, it threatens the integrity of southeastern pine agroecosystems, including longleaf pine (Pinus palustris Mill.). While studies have examined the impacts of cogongrass and various vegetation management strategies on longleaf pine understory plant communities, little is known...

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Correlation between infection by ophiostomatoid fungi and the presence of subterranean termites in loblolly pine (Pinus taeda L.) roots

John J. Riggins, Nathan S. Little, Lori G. Eckhardt

Agricultural and Forest Entomology > 16 > 3 > 260 - 264

Observations of subterranean termites feeding in pine sapwood containing ophiostomatoid fungi prompted the present study aiming to investigate the effect of infection by Leptographium fungi on the probability of encountering subterranean termites in loblolly pine (Pinus taedaL.) roots.Root samples were collected from 2350 loblolly pine trees in Alabama, Texas, Louisiana and Mississippi using hand...

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The effect of thinning and clear‐cut on changes in the relative abundance of root‐feeding beetle (Coleoptera: Curculionidae) in Pinus taeda plantations in central Alabama and Georgia

Yuan Zeng, Kathryn R Kidd, Lori G Eckhardt

Pest Management Science > 70 > 6 > 915 - 921

BACKGROUNDRoot‐feeding beetles, particularly Hylastes spp., Hylobius pales Herbst and Pachylobius picivorus Germar, increase in abundance in stressed forest stands and vector Grosmannia and Leptographium spp. fungi, which contribute to southern pine decline (SPD) in the southeastern United States. This study examined changes in the relative abundance of root‐feeding beetles in response to mechanical...

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Susceptibility of longleaf pine roots to infection and damage by four root-inhabiting ophiostomatoid fungi

George Matusick, Lori G. Eckhardt, Greg L. Somers

Forest Ecology and Management > 2010 > 260 > 12 > 2189-2195

Restoration of longleaf pine-dominated uplands is common on many public and private lands throughout the southeastern United States. The once dominant longleaf pine ecosystem is important to many now-threatened and endangered plant and animal species, and land managers are increasing efforts to reestablish this fire-dependent forest. Unfortunately, tree mortality in longleaf pine has been observed...

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A new Ophiostoma species from loblolly pine roots in the southeastern United States

James W. Zanzot, Z. Wilhelm Beer, Lori G. Eckhardt, Michael J. Wingfield

Mycological Progress > 2010 > 9 > 3 > 447-457

During the course of a survey of fungi in loblolly pine (Pinus taeda) roots in Georgia, USA, a species of Ophiostoma morphologically similar to O. pluriannulatum, was isolated. Morphological characteristics and DNA sequence comparisons were used to identify the fungus. The isolates produced perithecia with unusually long necks similar to those of O. pluriannulatum but they had few or no annuli. DNA...

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Topographic features associated with loblolly pine decline in central Alabama

Lori G. Eckhardt, Roger D. Menard

Forest Ecology and Management > 2008 > 255 > 5-6 > 1735-1739

Loblolly pine (Pinus taeda L.) decline has been present in upland sites of central Alabama since the 1960s. Symptoms of loblolly pine decline (fine root deterioration, short chlorotic needles, sparse crowns, reduced radial growth) begin in the 30–40 year age class, resulting in premature death at ages 35–50. Loblolly pine decline occurs on sandy, well-drained soils and is associated with Leptographium...

article

Tobacco Mosaic Virus Replicase-Mediated Cross-Protection: Contributions of RNA and Protein-Derived Mechanisms

Sameer P. Goregaoker, Lori G. Eckhardt, James N. Culver

Virology > 2000 > 273 > 2 > 267-275

Specific sequences of the tobacco mosaic virus (TMV) RNA-dependent RNA-polymerase (RdRp) gene were investigated for their ability to confer cross-protection. Nine overlapping segments ranging from 713 to 1070 nucleotides in length and covering the methyltransferase, helicase, and polymerase (POL) domains of the TMV RdRp open reading frame were systemically expressed in Nicotiana benthamiana using...

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Search results for: Lori G. Eckhardt

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