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 8 of 8 for “"Agricultural weeds"”.
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Population Genetics and Phylogenetic Context of Weed Evolution in the Genus Amaranthus: Amaranthaceae)
<p>Agricultural weeds have evolved to compete aggressively with domesticated plants in agricultural environments. Although the evolution of invasiveness has been studied extensively in natural ecosystems, few comparable studies have been conducted using agricultural weeds. In this dissertation, I …
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Feedback by the soil microbial community on the distribution of two weeds
… communities associated with soil feedback to two agricultural weeds, common sunflower (Helianthus annuus) and giant ragweed (Ambrosia trifida). These two plants generally follow opposite gradients of abundance from west to east in the northern United States, and I hypothesized that soil feedback …
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Adaptation of an invasive grass to agriculture: ecological and genomic evidence
… be particularly important in the context of agricultural weeds and exotic invaders, because intraspecific variation in these species might allow them to rapidly adapt to their unusually dynamic and variable environments. In a greenhouse study, we explored intraspecific variation in the size, …
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Effects of Sudangrass Cover Crop and Soil Solarization on Weed and Pathogen Management in Organic Strawberry Production
… techniques and soil solarization on important agricultural weeds and pathogens in organic strawberry production in Central California. Lab experiments assessed the time needed to kill weed seeds at temperatures typically achieved during soil solarization (40<strong>°</strong>C, …
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Sedge/Grass Meadow Restoration on Former Agricultural Land: Analysis of Establishment Success
… at three study sites located in about 4 ha of agricultural land recently acquired by New York State Department of Environmental Conservation (NYSDEC) adjacent to West Creek at its confluence with Braddock Bay in Hilton, Monroe County, New York. The restoration was conducted within a 75.35 to …
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A comparative study of the population dynamics of four Amaranthaceae species
<p>Some of the most problematic agricultural weeds found in the Midwest United States are found in the Amaranthaceae family, such as Amaranthus palmeri and A. tuberculatus. These summer annual weeds are troublesome due to their competitive ability, high seed production, and resistance to herbicides …
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Investigating the heritability of resistance fueling copy number variation in glyphosate resistant Amaranthus palmeri
… and promoting the evolution of resistance in agricultural weed populations. In Amaranthus palmeri, CNV of the EPSPS gene, the target of glyphosate herbicide, ranges from 1 to over 160 copies, and is the primary genetic determinant of glyphosate resistance. The amplified copies of EPSPS are …
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The Role of Evolutionary Processes in a Biological Invasion: An Experimental Study with <em>Silene latifolia</em>
… The hypothesis was tested using the aggressive agricultural weed, <em>Silene latifolia</em>. <em>Silene latifolia</em> is native to Europe and was introduced to North Amenca 200 years ago with the spread of agriculture. It has already been shown that this plant escaped its enemies upon …