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 15 of 15 for “"Field rate"”.
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The Effects of Agrochemicals on Litter Fungi
… layer were studied. When applied at normal field rates, the fungicides slightly reduced the total fungal numbers and species numbers isolated from leaf litter of Agrostis tenuis, although there were little or no effects with the herbicides at either normal field rate or elevated rates. When …
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Contributions toward the integrated pest management of diamondback moth, Plutella xylostella (L.), on collards in Virginia
… insecticide resistance. In 2003, laboratory and field studies were initiated in Virginia to better understand P. xylostella, its primary natural enemies, and their susceptibilities to insecticides in order to develop an economically and environmentally sound integrated pest management program for …
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Fungicide Resistance of Botrytis Cinerea from Virginia Wine grapes, Strawberry, and Ornamentals Crops
… and isolates from eastern US strawberry fields have regularly been identified with resistance to several modes of action. During the 2011-2015 growing seasons, 487 isolates were collected from Virginia wine grapes, strawberries, and ornamental crops and evaluated for sensitivity to eight …
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Environmental Performance of Steel Grit and Specialty Sand as Abrasives
Dry abrasive blasting is a surface preparation process used in shipyards for cleaning the surfaces of the metal plates to be used in various components of the ship. Commonly used abrasives include sand, steel grit, mineral abrasives, metallic abrasives, and synthetic abrasives. The basic objective …
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Characterization of fungicide resistance in grape powdery and downy mildew using field trials, bioassays, genomic, and transcriptomic approaches: quinoxyfen, phosphite, and mandipropamid
… resistance or QLR) were detected in Virginia. Field trials were conducted in 2014, 2015, and 2016 at the affected vineyard to determine to what extent quinoxyfen might still contribute to disease control. Powdery mildew control by quinoxyfen was good, similar to, or only slightly less, than …
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Dicamba Effects on Soybean (Glycine max) Growth, Yield, and Offspring
… on soybean growth, yield, and offspring. Low rates of dicamba [1/64X (8.75 g ae ha-1) and 1/256X (2.18 g ae ha-1) of a normal 1X field rate (560 g ae ha-1)] were applied at two vegetative growth stages (V4, V6) and at each reproductive growth stage from R1 to R6. Compared to the nontreated …
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Use of the egg parasitoid, Trichogramma ostriniae (Hymenoptera: Trichogrammatidae) as a biological control agent of the European corn borer, Ostrinia nubilalis (Lepidoptera: Crambidae): An approach to integrated pest management in bell pepper
Four to six separate inundative releases of ~30,000 to 50,000 T. ostriniae per 0.02 ha significantly reduced damage by O. nubilalis in bell pepper. Egg parasitization averaged 48.7% in T. ostriniae release plots, which was significantly higher than non-release plots (1.9%). Also, cumulative green …
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Phenology and Management of Annual Bluegrass Weevil on Virginia Golf Courses
… putting emphasis on scouting to achieve accurate insecticide timing and acceptable control. Little is known about the biology and management of ABW in Virginia's more temperate climate. Reported cases of ABW resistance to pyrethroids (IRAC Group 3) continues to grow in the northeast, yet no …
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Modeling Radiation Damage in Nanostructured Ferritic Alloys: Helium Bubble Precipitation on Oxide Nanofeatures
… the metal. To further study the material, a mean-field rate theory model (MF-RTM) was created to simulate the radiation-induced segregation (RIS) of the alloy components Y, Ti, and O to the grain boundaries. Later, a kinetic Monte Carlo model (KMC) was made that replicated the results from the …
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Investigations of the integrated pest management of Colorado potato beetle, Leptinotarsa decemlineata (Say): Host plant preference, development of semiochemical-based strategies, and evaluation of a novel insecticide
… chemical ecology of an insect can unveil novel strategies for its pest management. Though much has been learned about the chemical ecology of Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae), a major pest of solanaceous crops in the U.S., there has been …
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Effects of depth cues on depth judgements using a field-sequential stereoscopic CRT display
… information displays has focused on the use of field-sequential CRT techniques to present binocular stereoscopic images. Although it is widely believed that stereopsis provides a potent depth information cue, numerous monocular cues exist which may augment, detract from, or even supplant …
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Resistance evaluation and management of Colorado potato beetle, Leptinotarsa decemlineata (Say), using novel chemistries
… and the development of alternative control strategies regarding this insect pest. From 2010 to 2013, field and lab experiments were conducted to evaluate the efficacy of a novel insecticide tolfenpyrad on L. decemlineata. In leaf-dip assays, tolfenpyrad was highly toxic to L. decemlineata with …
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Aspects of population dynamics
… of our simulations are also compared to a mean-field analysis. We find that the parameter region of predator and prey coexistence is enlarged relative to the stationary situation when the carrying capacity varies periodically. The stationary regime of our periodically varying LV system shows …
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Establishment of COTESA VESTALIS (HALIDAY) and DIADROMUS COLLARIS (GRAV.) parasitoids of the DIAMONDBACK MOTH, PLUTELLA XYLOSTELLA (L.), and assessment of the effectiveness of C. VESTALIS as a biological control agent in Zambia
… of the exotic parasitoids was through field sampling and collection of various developmental stages of the parasitoids, in and around the release sites in Lusaka Province. The assessment of the effectiveness of C. vestalis, as a biological control agent of the crop pest was through …
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Applications of Stein's method and large deviations principle's in mean-field O(N) models
… classical XY model on complete graph in the mean-field (infinite-vertex) limit. Using theory of large deviations and Stein's method, in particular, Cramér and Sanov-type results, we present a number of results coming from the limit theorems with rates of convergence, and phase transition behavior …