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 42 for “"weed science"”.
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Looking for Dandelions: On Finding Care in the Wastelands of Settler Colonialism
… can identify, whether because of their yellow weedy presence in lawns or childhood puffball wishes blown into the wind. They are also potent medicine and nourishing food—used for millennia and brought here intentionally by European colonizers. Looking for Dandelions draws on Robin Wall …
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Dissecting phenotypic inheritance of very-long-chain fatty acid inhibitor resistance in waterhemp (Amaranthus tuberculatus) using a novel greenhouse assay: 'PRIM'
Weedy plant species, especially within the genus Amaranthus, capable of surviving the selective phytotoxic effects of an EPA-approved chemical at its most vulnerable growth stage, represent a clear and present danger to the United States and perhaps the world. Such a threat, if left unchecked, may …
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Crop Canopy Effects on Kochia Establishment in Crop Fields
… seed production in order to develop integrated weed management recommendations that account for crop competition. Field and greenhouse studies were carried out in 2010, 2011 and 2012 in Brookings SD. The first experiment, sort to quantify the effect of crop canopies on kochia germination, …
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Synthesis of Dicamba Glucosides for the Study of Environmental Dicamba Drift Effects on Soybeans
<p>The most popular herbicide used for weed control has been glyphosate for many years in the Midwestern United States. Plants have begun to develop a resistance to glyphosate due to over use of the herbicide. This herbicide resistance has pushed farmers to turn to alternative herbicides such as …
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A CHARACTERIZATION OF SELECTION FOR EVOLVED RESISTANCE TO PROTOPORPHYRINOGEN OXIDASE (PPO)-INHIBITING HERBICIDES IN AMARANTHUS TUBERCULATUS
Weed management options in agronomic crop production have been severely limited by widespread populations of weeds resistant to herbicides, including waterhemp [<italic>Amaranthus tuberculatus</italic> (Moq.) Sauer (syn. <italic>rudis</italic>)] resistant to foliar applications of herbicides that …
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VARIATION BETWEEN PERIPHERAL AND CENTER ACHENE MORPHOLOGY AND ATTRIBUTES OF ACHENE GERMINATION IN THE INVASIVE SPECIES, <i>CENTAUREA MELITENSIS</i>
… disturbed and undisturbed environments despite weed management practices. Understanding reproduction and dispersal strategies in these species can aid in developing management approaches to help control their spread. <em>Centaurea melitensis</em>, a nonnative invasive with European origins, is …
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Salinity Tolerance of Flowering Rush, Butomus umbellatus
<p>Flowering rush is an invasive aquatic plant in North America that causes deleterious effects to native ecosystems. There are two cytotypes, a triploid and diploid, and multiple genotypes contained within the diploid cytotype currently established in the U.S. Despite its presence in river …
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Evaluation of Flame Weeding in Southeastern South Dakota
<p>Weed management is the main yield-limiting factor in production of organic crops. Currently, organic producers have limited resources available for in-row weed management. Flame weeding has been recognized for its potential as one part of an integrated approach at weed management in organic …
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Corncob Grit Application as an Alternative to Control Weeds in Two Crop Production Systems
<p>Weed management is one of the most challenging production problems in organic cropping systems because of limited weed control methods. Grits, derived from agricultural residues, have been demonstrated to control weed seedlings selectively in corn. This research examined weed efficacy and crop …
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Morphologic and Transcriptomic Response to Weed Pressure in Multiple Maize (Zea mays L.) Selections and Teosinte (Zea mays L. ssp parviglumis) Lines
… L. <em>indentata</em>) have varying degrees of weed tolerance (ability to maintain yield under weed stress). Maize retains ~30% of its ancestral teosinte’s (<em>Zea mays</em> ssp<em> parviglumis</em>) genetic base. Transcriptomic response to weed pressure in maize and teosinte can lead to …
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Prioritizing the Management of Arundo Donax: Recommendations for Removal and Revegetation in California Riparian Habitats
<p>The highly invasive grass species, giant reed (<em>Arundo donax),</em> has been a major contributor to riparian habitat degradation in California for over 50 years. Several modes of vegetative reproduction have allowed this alien species to take advantage of fluvial processes and rapidly spread …
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Restoration through reassembly: evaluating the role of native plants in combatting Chinese tallow
<p>Non-native, invasive species disrupt ecological processes and functions, posing a serious threat to natural ecosystems. By examining the growth metrics of the non-native, invasive tree, Chinese tallow (<em>Triadica sebifera</em> [L.] Roxb.), hereafter tallow, across different flooding and light …
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Evaluation of Safening Effects to Herbicides Conferred via Insecticide Seed Treatments in Soybean (Glycine max) and Grain Sorghum (Sorghum bicolor)
<p>Interactions between herbicides and insecticides in crop production have been documented for a number of years. Research has shown that applications of some organophosphate insecticides at planting can reduce cotton injury following applications of the soil-applied herbicide clomazone. …
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Distribution and Control of Herbicide-Resistant Italian Ryegrass (Lolium perenne L. ssp. multiflorum Lam. Husnot) in Arkansas
… to herbicides that producers rely on for weed control both in wheat and burn-down. The objectives of this research were to: test populations of Italian ryegrass from across Arkansas for resistance to glyphosate, diclofop, pinoxaden, and pyroxsulam; determine if there were any differences …
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Evaluation of Novel Techniques to Control Annual Grasses in Intensively Managed Turfgrass Systems
Annual grassy weeds are problematic in intensively managed turfgrass systems due to a lack of selective and affordable control options. Four projects were conducted from 2020-2023 to evaluate novel techniques for Annual bluegrass (Poa annua L.), goosegrass (Eleusine indica L. Gaertn.), and smooth …
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Evaluation of Crop Tolerance and Weed Control in Corn and Grain Sorghum with Atrazine Replacements
<p>Atrazine is a foundational herbicide for weed control in both corn (Zea mays L.) and grain sorghum [Sorghum bicolor (L.) Moench] production. However, studies have shown that while atrazine may be an effective herbicide for preemergence and postemergence control of weeds, it also has risks. The …
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Decision Support Software for Palmer Amaranth Weed Control
… been identified as one of the most troublesome weeds, specifically for corn (Zea mays L.), cotton (Gossypium hirsutum L.), and soybean [Glycine max (L.) Merr.] producers in the southern United States. The use of herbicide technology remains the most widely used method of weed control, despite …
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Mitigating Rice Injury Caused by Florpyrauxifen-Benzyl and Optimizing Florpyrauxifen-benzyl Rate and Timing for use in Furrow-Irrigated Rice
… florpyrauxifen-benzyl in furrow-irrigated rice weed control programs to control problematic weed species such as Palmer amaranth (Amaranthus palmeri S. Wats). Florpyrauxifen-benzyl effectively controlled Palmer amaranth in a greenhouse study at lower-than-labeled rates and was found to be an …
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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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