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 22 for “"herbicide efficacy"”.
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Variable weather and implications for herbicide efficacy and yield loss due to weeds
… was conducted on a database of >3,000 individual herbicide evaluation trials conducted between 1992 and 2019. Chapter 1 of this dissertation is a review of the literature related to climate change and weed interference effects on corn and soybean production. In Chapter 2 we quantified rainfall and …
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THE INFLUENCE OF CARRIER WATER QUALITY, COAPPLIED FOLIAR FERTILIZER, AND WATER CONDITIONING ADJUVANT ON HERBICIDE EFFICACY
Water is the primary carrier for herbicide applications; therefore, carrier water quality factors such as pH, hardness, temperature, or turbidity could be critical for influencing herbicide performance. Currently, there is no information on the effect of carrier water temperature on herbicides …
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Biology and Control of Eastern Black Nightshade, Palmer Amaranth, and Common Pokeweed, in No-Till Systems on the Eastern Shore Regions of Virginia and Maryland
… Eastern Shore regions of Virginia and Maryland. Herbicide resistance and lack of herbicide efficacy further complicate the job of controlling these weeds. Studies were conducted on each of these weeds in order to determine herbicide efficacy and potential herbicide resistance. In addition, the …
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The life history and control of bigroot morning glory (Ipomoea pandurata)
… germination, emergence, and growth and on herbicide efficacy, absorption and translocation in this weed, were conducted with the goal of developing effective control measures.
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Evaluation of Screening Techniques for Woody Plant Herbicide Development
Woody plant herbicide screening techniques were evaluated in an attempt to expedite the screening process and decrease amounts of herbicide active ingredient required. Rapid greenhouse screening of woody plant seedlings was performed in less than six months while rapid seed screening was performed …
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A CHARACTERIZATION OF SELECTION FOR EVOLVED RESISTANCE TO PROTOPORPHYRINOGEN OXIDASE (PPO)-INHIBITING HERBICIDES IN AMARANTHUS TUBERCULATUS
… 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 inhibit protoporphyrinogen oxidase (PPO; EC 1.3.3.4) activity (PPO-R). …
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Poison hemlock (conium Maculatum L.) : biology, implications for pastures and response to herbicides
… ecology, growth characteristics and response to herbicides. Seed production, viability and germination of poison hemlock seed were measured. Dry biomass of poison hemlock was measured through time in the early spring in relation to plant density. Herbicide efficacy experiments were conducted in …
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Uptake, translocation, and metabolism 2,4-D in enlist crops and control of drought-stressed waterhemp (Amaranthus tuberculatus) with 2,4-D and glyphosate
The synthetic auxin herbicide, 2,4-dichlorophenoxyacetic acid (2,4-D), is one of the oldest and most widely-used herbicides in the world and is a systemic, postemergence (POST) herbicide that is selective in monocots such as corn, wheat, sorghum, and turf, but dicots are sensitive to 2,4-D. Auxin …
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Herbicide strategies for Palmer amaranth (Amaranthus palmeri) management in Illinois
… Chapter 1 includes a literature review of herbicides pertinent to these experiments and a section of Palmer amaranth biology. Chapter 2 characterizes the growth accumulation and emergence patterns of Palmer amaranth in Illinois to determine when and how long this weed will compete with …
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Evaluation And Characterization of Herbicide Resistance In Italian Ryegrass (Lolium multiflorum Lam.) Biotypes To Diclofop-methyl And Alternative Management Options
… across Virginia, (2) evaluation of alternative herbicide efficacy for diclofop resistant Italian ryegrass control, and (3) characterization of the aryloxyphenoxypropionate (APP) resistance mechanism in resistant Italian ryegrass biotypes. The response of 32 biotypes to diclofop collected from …
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Efficacy of Soybean Herbicides on Annual Morninglory
… Complex in Bowling Green, Kentucky to evaluate herbicide efficacy on annual morningglory (Ipomoea spp.) species and other weeds. A randomized complete block design was utilized in each study with each treatment being replicated three times. Plots consisted of four 76 cm rows, 9.1 m in length. …
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Characterization of Organosilicone Surfactants and Their Effects on Sulfonylurea Herbicide Activity
… surfactants and their effects on sulfonylurea herbicide activity. The project included efficacy tests, rainfastness studies in the greenhouse, radiotracer studies on herbicide uptake, fluorescent dye studies on surface deposition, and various measurements of physico-chemical properties. In …
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Herbicide resistance in Black-grass (<i>Alopecurus myosuroides</i> Huds.)
Herbicide resistant grass weeds are a growing problem throughout the UK with <i>Alopecurus myosuroides</i> Huds. (black-grass) considered a major problem in winter cereals. Blackgrass control is hindered by the presence of populations resistant to herbicides. Research indicates that resistance in …
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Physiological and Environmental Basis of Turfgrass and Weed Response to Mesotrione Formulations
Mesotrione is the first triketone herbicide registered for use in turfgrass. Triketones prevent carotenoid biosynthesis by inhibiting the enzyme p-hydroxyphenylpyruvate dioxygenase (HPPD). Although mesotrione controls many species of grass and broadleaf weeds, it is best know for selective control …
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Herbicide resistance in kochia and wheat: the loss and gain of weed control tools for wheat production
… systems relies heavily on the use of chemical herbicides. While these herbicides are largely effective and very efficient, they are prone to herbicide resistance evolution in weeds. Herbicide resistance evolution is the most pressing issue facing weed scientists, currently. As researchers …
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Influence of Annual Bluegrass on Putting Green Trueness and Control of Weedy Poa Species in Kentucky Bluegrass and Creeping Bentgrass Turf
… on golf courses throughout the United States. Herbicides for selective control of these weeds in cool-season fairways are limited and ineffective. Methiozolin is a new isoxazoline herbicide that controls annual bluegrass on putting greens and shows promise for possible weed control in fairways. …
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Potential for site specific management of Lolium rigidum (annual ryegrass) in Southern Australia.
… farmers’ financial returns through reduced herbicide costs while maintaining weed control in commercial paddocks near Bute and Tarlee, SA. Commercially available sensors N-Sensor, Greenseeker, Crop Circle and digital RGB camera were assessed for their ability to detect annual ryegrass …
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Control, Assessment and Glyphosate Resistance of Palmer Amaranth (Amaranthus palmeri S. Wats) in Virginia
… awareness among farmers and agribusinesses of herbicide resistant weeds in Virginia; ii) determine the efficacy of commonly used cotton and soybean herbicides programs for Palmer amaranth control; and iii) conduct greenhouse experiments to quantify the level of glyphosate resistance in a …
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Impact of Sulfonylurea Herbicides on Seeded Bermudagrass Establishment and Cold Temperature Influence on Perennial Ryegrass Response to Foramsulfuron
… bermudagrass and introduction of sulfonylurea herbicides have given turf managers new tools. Seedling bermudagrass response to sulfonylurea herbicides applied before or soon after seeding has not been characterized. Field observations have indicated that variability exists among sulfonylurea …
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Assessing Spray Deposition and Weed Control Efficacy from Aerial and Ground Equipment in Managed Turfgrass Systems
… in agricultural spray drone (ASD) use for herbicide application in managed turfgrass systems, which historically has precluded aerial application. Considering pesticide deposition accuracy is of utmost importance in managed turfgrass systems, a thorough examination of factors that influence …
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