Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Bark beetles"”.
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Hymenopterous parasites of lps spp. bark beetles (Coleoptera:Scolytidae) in Virginia
The pine engraver beetles (~ spp.:Coleoptera:Scolytidae) may be serious pests depending on certain prerequisite conditions. In their secondary or "normal" role they breed in slash and damaged, dying, and dead trees. The broods emerging from these sources normally attack similar material. When such …
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Bark beetles associated with killed Virginia pine (Pinus virginiana Mill.) in Patrick County, Virginia
Killed Virginia pine, (Pinus virginiana Mill.), held in the vertical position, attracted 99.65 percent of the insects in the families Scolytidae, Cerambycidae, Curculionidae, and Buprestidae. The remaining 0.35 percent were collected from nontreated control trees. The dominant insect species were …
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Monitoring Abundance of Ips Bark Beetles and Determining Related Tree Mortality in Arkansas and Texas
<p>The abundance of the southern pine engraver beetles, Ips avulsus (Eichhoff), I. grandicollis (Eichhoff), and I. calligraphus (Germar), was monitored with pheromone-baited traps in 2012 and 2013 in Arkansas and eastern Texas. Additionally, vehicle-based and comprehensive ground-based surveys were …
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The Southern pine beetle, Dendroctonus frontalis Zimm., and associated Coleoptera attracted to dead loblolly pine, Pinus taeda L.
This study tests the hypothesis: Bark beetles initially locate their host trees in a non-random manner. The association of the southern pine beetle (<u>Dendroctonus frontalis</u> Zimm.) and associated Coleoptera with stressed trees suggested the direction for this study. Loblolly pine trees, …
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Time series analysis of limber pine (Pinus flexilis) health in the U.S. Rocky Mountains in response to white pine blister rust (Cronartium ribicola) and bark beetles
… response to white pine blister rust (WPBR) and bark beetles (including mountain pine beetle, "MPB", and Ips spp., "Ips") over time. These plots were subsequently measured in 2011-2013 and again in 2016-17 to form a time series analysis of limber pine health. Data were gathered on 8,206 …
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Modeling Endemic Bark Beetle Populations in Southwestern Ponderosa Pine Forests
Bark beetle populations phase between epidemic, outbreak levels, and low population density, endemic levels. The majority of scientific research is focused on outbreak populations because of the associated economic, ecological, and social impacts. Endemic populations are rarely studied but could …
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MULTI-PARTNER MUTUALISMS: INTERACTIONS AMONG THE MOUNTAIN PINE BEETLE AND TWO OPHIOSTOMATOID FUNGAL ASSOCIATES
… The main research questions were: What drives bark beetle fungal interactions? What is the nature of the interaction between the two species of fungi? I tested the hypothesis that the fungi provide nutritional benefits to the bark beetles. Evidence suggests a nutritional role of fungi in the …
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MULTI-PARTNER MUTUALISMS: INTERACTIONS AMONG THE MOUNTAIN PINE BEETLE AND TWO OPHIOSTOMATOID FUNGAL ASSOCIATES
… The main research questions were: What drives bark beetle fungal interactions? What is the nature of the interaction between the two species of fungi? I tested the hypothesis that the fungi provide nutritional benefits to the bark beetles. Evidence suggests a nutritional role of fungi in the …
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Effects of host stored resources on bark beetle-fungal-conifer interactions
<p>Bark beetles and their associated fungi are among the greatest natural threats to conifers worldwide, but the degree to which host stored resources influence tree-beetle-fungal interactions has not been investigated. In western North America, the range of the mountain pine beetle (Dendroctonus …
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Effects of host stored resources on bark beetle-fungal-conifer interactions
<p>Bark beetles and their associated fungi are among the greatest natural threats to conifers worldwide, but the degree to which host stored resources influence tree-beetle-fungal interactions has not been investigated. In western North America, the range of the mountain pine beetle (Dendroctonus …
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Biology and host finding of predaceous hister beetles (Coleoptera: Histeridae) associated with Ips spp. (Coleoptera: Scolytidae) in loblolly pine (Pinus taeda L.)
… (Coleoptera) found associated with Ips engraver beetles (Coleoptera: Scolytidae) in Louisiana were Platysoma attenuata LeConte, Pla. cylindrica (Paykull), Pla. parallelum (Say), and Plegaderus transversus (Say). Seasonal abundance of histerids in flight traps coincided with Ips spp. activity in …
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Studies on the spread of Verticicladiella procera by soil-borne and insect-borne propagules
… with and without PRD. The percent of weevils and bark beetles contaminated with V. procera was 64 and 0.76 respectively. Verticicladiella procera was transmitted to white pine bolts in the field and under controlled conditions following visitation by contaminated insects. Verticicladiella procera …
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Utilization potential for pulp and paper of southern pine harvested from beetle infested forests
… characteristics of southern pines infested by bark beetles to various periods of time since death would be a valuable supplement to this investigation for the practicing forester. (6) Whenever the tear resistance of paper made from the kraft process is a critical determinate for the utility of …
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Aggregation Pheromone Biosynthesis and Engineering in Plants for Stinkbug Pest Management
… and other agricultural pests such as bark beetles and flea beetles are known to synthesize terpenoids as aggregation pheromones. Knowledge of the genes and enzymes involved in pheromone biosynthesis may allow engineering of pheromone biosynthetic pathways in plants to develop new forms …
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The fungi and bacteria associated with three tree-killing beetles: from new species to complex communities.
… can play critical roles in the life cycles of bark and woodboring beetles, influencing tree colonization and, in some cases, negatively impacting tree health. This dissertation investigates the microbial communities of two bark beetles and one woodboring beetle. The eastern larch beetle …
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Ecology of Mite Phoresy on Mountain Pine Beetles
… interaction and demands clarification. In bark beetles (Scolytinae), both effects are documented during reproduction and effects on hosts during the actual dispersal are largely unknown. In the present research, I investigated the ecological mechanisms that determine the net effects of the …
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Forest respiration from eddy covariance and chamber measurements under high turbulence and a bark beetle epidemic
… at night potentially causing the difference. A bark beetle outbreak at the GLEES Ameriflux site provided a unique opportunity to compare chamber and EC estimates of ecosystem respiration (R) under conditions of high turbulence (summer night mean u* = 0.7 m s-1) and 85% mortality of the …
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Aggregation, dispersal and edge behavior of the bark beetle predator Thanasimus dubius (Coleoptera: Cleridae); potential use in biological control
Bark beetles are major pests of pine forests in North America that can inflict considerable damage and cause severe economic loss. The checkered beetle Thanasimus dubius Fabricius (Coleoptera: Cleridae), an abundant predator in the Eastern USA and Canada, has been suggested to influence the …
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Proteomic studies of the pheromone biosynthetic pathway in the bark beetle, Ips pini, and molecular modeling of an insect-specific aldehyde oxidative decarbonylase, CYP4G2
Bark beetles have had devastating economic and environmental impacts in both the United States and Canada in the last decade. Male pioneer pine engraver beetles, Ips pini, find a host tree and release an aggregation pheromone, ipdienol. Ipsdienol is produced de novo in midgut tissue and is released …
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Forest Mortality in Lake Tahoe Basin from 1985-2010: Influences of Forest Type, Stand Density, Topography and Climate
… vast majority of mortality is mediated by native bark beetles (Coleoptera: Scolytinae), more proximal exogenous factors such as drought, and endogenous factors such as stand density and environmental setting have also been implicated (Allen et al. 2010). This study utilizes remote sensing imagery …
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