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 20 for “"insect infestation"”.
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Water Requirements, Use Efficiency, and Insect Infestation in Brussels Sprouts, and Nitrogen Use Efficiency in Sweet Basil under Low Tunnels compared to Open-field Production
… global concerns about water availability, insect-pest problems, and costly fertilizer inputs severely impact the growth and production of these crops. Low tunnels covered with spun-bonded fabric can improve production of vegetables and herbs in Virginia and the U.S. This study investigated …
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Investigation of dried distillers grains with solubles (DDGS) susceptibility to red flour beetle (Tribolium castaneum (Herbst)) infestation
<p>Protecting livestock feed from insect infestation is a common challenge that feed facility managers and farmers have to deal with. It becomes an issue of importance because insect infestation degrades feed quality and quantity. Dried Distillers Grains with Solubles (DDGS) is added to livestock …
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Food irradiation as a method of limiting crop loss in developing nations
… exceed 50%. With commodities such as dried fish, insect infestation is reported to result in a loss of 25% of the product with an additional 10% lost due to spoilage. While not all of these losses can be prevented by food irradiation, the technology does offer unique potential to destroy insect …
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Modeling forest protection values for the southern Appalachian spruce-fir forest
… a forest showing no visible sign of impact from insect or atmospheric disturbance. Households in the second sample were asked to value a protection program for a forest already experiencing impact from insect infestation and air pollution. Logit analysis of the two samples revealed no …
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REGULATION OF DEFENSE RESPONSES MEDIATED BY BON1 AND BAP2 IN ARABIDOPSIS THALIANA
… and resources are spent combating widespread insect infestation and microbial infections. Comprehension of the natural defenses against these threats could enable the production of genetically modified plants with enhanced innate immunity without the use of chemicals to which insects and …
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Isozyme variation within the Fraser fir population on Mt. Rogers, Virginia
… so far, been able to withstand the impacts of insect infestation and the possible influence of atmospheric deposition factors which may be causing mortality in other regions of the southern Appalachians. It was hypothesized that population vigor may be due to a unique genetic structure. The …
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Bark beetles associated with killed Virginia pine (Pinus virginiana Mill.) in Patrick County, Virginia
… position, attracted 99.65 percent of the insects in the families Scolytidae, Cerambycidae, Curculionidae, and Buprestidae. The remaining 0.35 percent were collected from nontreated control trees. The dominant insect species were analyzed regarding seasonal abundance and specificity in …
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Western corn rootworm damage assessment in Virginia and adult sampling with commercial yellow sticky traps
… root damage in corn left untreated with a soil insecticide. In addition, 190/0 of the fields overall had an economic loss in silage due to corn rootworm damage. A second study evaluated the effectiveness of using adult corn rootworm counts on commercial Olson yellow sticky traps and ear-zone …
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Diverse functions of the two segmentally duplicated 9-lipoxygenases ZmLOX4 and ZmLOX5 of maize
… highlighted in host defenses to pathogens and insects, the functions of 9-LOXs and 9-LOX derived oxylipins remain obscure for both monocots and dicots. The objective of this study was to elucidate the biochemical, molecular and physiological roles of a segmentaly duplicated pair of 9-LOXs, …
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HYPERSPECTRAL REMOTE SENSING FOR ADVANCED DETECTION OF EARLY BLIGHT (ALTERNARIA SOLANI) DISEASE IN POTATO (SOLANUM TUBEROSUM) PLANTS
Early detection of disease and insect infestation within crops and precise application of pesticides can help reduce potential production losses, reduce environmental risk, and reduce the cost of farming. The goal of this study was the advanced detection of early blight (Alternaria solani) in …
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Profiling of gene expression in bread wheat (Triticum aestivum L.) line PI 137739 in response to Russian wheat aphid (Diuraphis noxia Mordvilco) feeding
… of Russian wheat aphid (RWA; Diuraphis noxia) infestation on the defence responses of the bread wheat line, PI 137739, on a molecular level. PI 137739 is known to contain the RWA resistance gene, Dn1. The study was conducted by utilising and combining a vast array of molecular biological …
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The effects of leaf harvesting on the morphology, reproduction and sap production of the Cape Aloe (Aloe Ferox)
… the loss of leaf material. Plants suffering from insect-infestation or disease are not harvested to avoid weakening the plant further and possibly causing death (Newton and Vaughan 1996). Effort is also made by landowners to relocate plants growing in areas they plan to transform and to monitor …
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Harakeke (Phormium tenax) ecology and historical management by Maori: The changing landscape in New Zealand
… or pii harakeke, which may also have prevented insect infestation. Cumulatively, there is evidence of extensive active management of harakeke. Wharariki and harakeke were found to have distinct environmental niches, with wharariki better able to withstand cooler temperatures, higher rainfall and …
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The effect of a cabbage-carrot intercropping system on the incidence of cabbage pests
… significantly to global crop production. Insect pests associated with cruciferous crops have the potential to destroy harvests. The diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae) and cabbage aphids, Brevicoryne brassicae (L.) and Lipaphis erysimi (Kaltenbach) …
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Methods for the spatial modeling and evalution of tree canopy cover
… cover can be an indicator of forest health, insect infestation, or disease. This dissertation consists of three studies, focused on the spatial modeling and evaluation of tree canopy cover, drawing on recent developments and best practices in the fields of remote sensing, data collection, and …
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Chemical treatment of bread corn during milling process to eliminate insect contamination
… was to develop a satisfactory method by which insect infested corn could be treated continuously to eliminate the contamination normally found in the corn meal produced from the corn. An extensive literature review was compiled covering the processing of corn, the description of insects …
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Scientific visualization of multi-temporal remotely-sensed data for monitoring drought-related famine conditions : nutritional, socio-economic & climatic vulnerability in Sudan's Gezira
… instability and international isolation, insect infestation in the irrigated agricultural schemes, prevalence of diseases such as schistosomiasis, malaria and cholera), and with an analysis of alternative future what-if scenarios. Potential vested constituents for such technology include …
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Dispersión y predación de semillas por la fauna : implicaciones en la regeneración forestal de bosques templados
… interacciones entre especies animales (p. ej. insecto predador y roedor dispersor) y, por último, el destino final de la semilla en la primavera siguiente (germinación y establecimiento exitoso). Las aportaciones más relevantes se refieren a la capacidad dispersora del ratón de campo (hasta 132 …
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SPECIATION STUDIES FOR BIOGENIC VOLATILE ORGANIC COMPOUNDS AND SECONDARY ORGANIC AEROSOL GENERATED BY OZONOLYSIS OF VOLATILE ORGANIC COMPOUND MIXTURES
… from trees and how they vary as a function of insect infestation. Also, the role of mixtures of VOCs as SOA precursors are investigated; commercial and lab made VOC mixtures are studied for SOA generation, product analysis, and absorption characteristics of aged SOA. Chapter 1 introduces PM, …
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Life history and reproductive ecology of selected proteaceae in the mountain Fynbos Vegetation of the South-Western Cape
… bank dynamics and pre-dispersal predation by insects, (3) seed germination and seedling mortality, and (4) an analysis of the relationship between plant life-histories and fire frequency distributions. In the first study, mortality rates of Pro tea neriifolia, P. lacticolor and Leucadendrofl …