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 14 of 14 for “"invasive weed"”.
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Integrated management of the invasive weed, cut-leaved teasel (Dipsacus laciniatus L.) along a Missouri highways
Cut-leaved leaved teasel is an invasive, exotic, and noxious weed in Missouri. Biennial plant infest roadsides and undisturbed areas. Studies regarding seed biology, detection, and control measures were conducted to improve teasel management along a four mile section of Highway interstate 70 in …
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Consequences of global redistribution on the ecology and evolution of the invasive weed Pastinaca sativa and its associated insect fauna
… are native to Europe but they occur as an invasive association throughout the temperate world. New Zealand (NZ) populations of wild parsnips were free from webworm herbivory for 140 years until 2004, when webworms were discovered, presumably having been accidentally introduced. This escape …
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Evolution at the edge: how hibernation, heat waves, and hybridization impact a range expansion
… ago for biological control of a widespread invasive weed. Through its role as a biological control agent, the tamarisk beetle has expanded its range hundreds of kilometers along rivers, colonizing new areas of the invasive weed in environments very different from its original release …
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Poison hemlock (conium Maculatum L.) : biology, implications for pastures and response to herbicides
Poison hemlock is a biennial, toxic and invasive weed that grows along roadsides, pastures and low-disturbed areas. Research was conducted to determine seed ecology, growth characteristics and response to herbicides. Seed production, viability and germination of poison hemlock seed were measured. …
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Biology and control of Amur honeysuckle
Amur honeysuckle (Lonicera maackii) is an invasive weed species that is present in a majority of the United States. This weed has the ability to displace native plant species and develop monocultures in undisturbed areas. Little is known about the biology and control options for this plant. The …
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Constraints on Neltumius arizonensis (Coleoptera: Bruchidae) as a biocontrol agent of prosopis in South Africa : the role of parasitoids
… and 1990 respectively, to curb the spread of the invasive weed Prosopis. Failure of A. bottimeri to establish and reduced effectiveness of A. prosopis due to interference by livestock resulted in the release of a third species, Neltumius arizonensis in 1992. 2. Algarobius prosopis populations have …
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Development and utilization of molecular tools to understand invasion biology in Centaurea maculosa (spotted knapweed)
… to help understand ecological phenomena in the invasive weed, spotted knapweed (Centaurea maculosa Lam.). In this dissertation, I first introduce the need for research at multiple scales and the potential benefits of collectively examining molecular, physiological and ecological phenomena in an …
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Characteristics of different focusing antennas in the near field region
… occurs in pulse radiating antennas as well. Invasive weed optimization (IWO), a new optimization algorithm, is also employed to optimize the pulsed array antenna. In the attempt of optimizing the focused arrays, a new scenario for designing thinned array antennas using this optimization …
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Impact of Roadside Maintenance Practices on Larinus minutus (Gyllenhal), a Biological Control Agent of Spotted Knapweed
<p>Spotted knapweed, Centaurea stoebe, is an invasive weed found throughout much of the United States. Spotted knapweed is a rangeland weed where it was originally introduced into western North America in the 1880s.Where spotted knapweed spread to the southeastern U.S., it is found mostly along …
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Systematics, Specificity, and Ecology of New Zealand Rhizobia
… and origin of rhizobial species nodulating invasive exotic legumes in New Zealand: Ulex (gorse), Cytisus (broom), and Acacia (wattles). 2) Determine the specificity and nitrogen fixing capacity of both groups of rhizobia. 3) Investigate the possible exchange of transmissible symbiotic …
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Ethnobotanical survey of problem weeds, alien invasive plant species and their roles in Nzhelele, Makhado Local Municipality, Limpopo Province, South Africa
Background: Problem plants and alien invasive weed species are part of today‟s ecological transformation. Ethnobotanical literature on ecological prominence and ethical values of problem alien weeds is scant and should be documented to avoid loss of valuable species. Aim: The study was aimed at …
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Fire Effects on Soil and Water Quality in the Sierra Nevada Mountains and Great Basin Ecosystems: Emphasis on Nitrogen
… made on the use of prescribed fire to control invasive weed populations. The final study of this thesis examined the growth and nitrogen uptake patterns of cheatgrass (Bromus tectorum) in three soil types from a Wyoming Big Sage-dominated system, an invaded cheatgrass area and a newly burned …
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Community Decision Making Aids for Improved Pasture Resources in the Madiama Commune of Mali
… potential of Cassia tora (C. tora) which is an invasive weed in the region as a supplemental feed for livestock. Cassia tora was harvested within the Madiama commune and ensiled with or without additives (water and or honey/sugar) for 60 or 90 days. Harvest occurred at the vegetative stage in …
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Impacts and management of Cenchrus ciliaris (buffel grass) as an invasive species in northern Queensland
… as one of Australia’s most serious environmental weeds. This introduced grass is associated with loss of native species and alteration of fire regimes. However there is considerable controversy regarding its weed status as it is also highly valued as a pasture species for arid and semi-arid zones. …