Italian ryegrass (Lolium perenne spp. multiflorum) is a common weed management problem in turfgrasses, cereals and non-crop areas in the United States. In Oregon, the number of populations with multiple-resistance continues to increase. To manage these resistant populations, the resistance patterns must be determined. In this study, five Italian ryegrass populations (CT, R1, R2, R3 and R4) from two cropping systems were studied for resistance patterns and mechanisms. The CT population is from a Christmas tree plantation and was resistant to at least six herbicides with four different mechanisms of action: atrazine, diuron (2.4-fold), glyphosate (7.4-fold), hexazinone (3.1-fold), imazapyr (1.8-fold), and sulfometuron. The resistant indices (RI) for sulfometuron and atrazine could not be calculated because 50% growth reduction for the CT population was not reached even with the highest rates applied, 17.6 kg ai ha⁻¹and 16 kg ai ha⁻¹, respectively, which are 16 times the recommended field application rates for this two herbicides. The CT population accumulated less shikimate than the S population. There were two mutations in the CT population, Trp591 to Leu in the ALS gene and Ser264 to Gly in the psbA gene, which explain the ALS and PII cross resistance, respectively. R1, R2, R3 and R4 were collected from annual cropping systems. All four populations were resistant to flufenacet. RIs for two populations, R2 and R4, were 8.4 and 5.9, respectively. R2 and R4 also were resistant to mesosulfuron-methyl, pinoxaden, quizalofop and clethodim. R4 was resistant to diuron, but R2 was not. An Asp-2078-Gly substitution in the ACCase gene was found in both R2 and R4 populations, while another Ile-2041-Asn substitution in the ACCase gene was found in the R4 population. These mutations explain the ACCase cross resistance in the R2 and R4 populations. The mechanisms for the glyphosate resistance in the CT population and the flufenacet resistance in R1, R2, R3 and R4 populations were not identified in this study. None of the five populations were resistant to the herbicide pyroxasulfone. / Graduation date: 2013

Graduation date: 1993

This study helps to answer the broader question of why Latino students across the U.S. persistently drop out of school at the highest rates compared to students of other racial groups by focusing on the institutional workings of the various levels of the Oregon school system. Latino students have the highest drop out rates in Oregon. The higher drop out rates for Latino students in Oregon reflect the national trend, though the latest national rates report considerably higher drop out rates for Latino students compared to Oregon's drop out rates. Quantitative research verifies that race is a critical factor affecting national high school completion rates for Latino youth. The purpose of this study is to reveal the major, persistent problems within a school system that hinder learning for Latino students who are primarily English Language learners. Toward this purpose, this study examines significant state and federal education laws, examines rhetoric related to education equality and interviews educators at various levels of the Oregon education system. The research reveals three primary reasons for the failure of Oregon schools to graduate Latino students. First, these primarily Spanish-speaking students are not provided the type of quality bilingual intercultural education required to promote learning. Second, Latino students experience a discriminatory school environment. Third, available funding is not being used to help English language learners to succeed in learning the English language nor academic material. The research outcome is relevant because what was found in Oregon reflects patterns of educational practice and policy and laws that have been reported in other states, supporting the idea that educational racism is institutional at all levels of the education system. The research also reveals specific tactics used to repress the advancement of Latino students and finds that public rhetoric supporting education equality among the races does not reflect practice and procedures at all levels of the public school institution that determine outcomes for Latino students in their individual schools. Despite rhetoric to the contrary, educators are deciding not to make the necessary changes to improve education for Latinos. It is apparent that persistent inequality is the result of colonialist attitudes and policies that continue to restrict learning for the majority of the Latino population, limiting their opportunities for advancement beyond the poverty characteristic of their low wage working class status in the U.S. / Graduation date: 2004

This dissertation explores the real world problem of rural youth out-migration and finds that the central problem is one of persistent class difference in this rural Oregon town. The research that informs this dissertation was conducted in a rural community of approximately 2300 residents in Eastern Oregon, here called Talltown. Data was collected through participant observation, photovoice (n = 8) and semi- structured interview (n = 63) among adolescents, emerging adults, and adults, specifically those working with local youth. The dissertation explores the ways in which Talltown youth encounter, internalize, and strategically enact dominant and counter norms of the local and larger fields. The primary finding of this dissertation is that as rural communities vie for position in the era of global neoliberalism, they discursively impose a similar competitive logic upon their youth, which reinforces the myth of meritocracy yet supports persistent class difference. Using the themes of "going somewhere" and "getting stuck," this dissertation aims to make visible, and thus challenge the hierarchical system with which class and other forms of socially constructed difference persist. / Graduation date: 2012

A large wave of Chinese immigrants came to the United States in the second half of the nineteenth century. Employment, mainly in the salmon-canning industry, drew thousands of them to coastal Astoria, Oregon. Taking the period between the first Chinese Exclusion Act in 1882 and the Immigration Act of 1924, this thesis focuses on the Chinese merchants in Astoria and their importance for our understanding of race relations in the town during these years. Specifically, the merchants help to make sense of how the Chinese related to the local white population, as different sources suggest different trends of amiability and hostility. Newspapers testify that local Chinese gained acceptance during the period, going generally from vilified outcasts to respected members of the community. Immigration case files, however, show that officials displayed little resistance to Chinese in the early exclusion years, but worked harder to deny Chinese applications toward the end of this period. So, from one body of records it seems that white Astorians grew more tolerant of Chinese during these years, while the other document set shows a rise in conflict with the immigrants. This apparent contradiction can be reconciled by considering the demographic changes in the Chinese immigrant community during this period, along with class biases and the role of merchants in immigration and social interactions.

College is usually thought of as a time where students, often living alone for their first time, are encouraged towards healthy risk-taking behavior, as well as social, intellectual, and vocational development. Unfortunately for female students, college becomes the time of their lives where they are exposed to the highest risk of sexual victimization. Many colleges across America have taken steps to address the significant problem of sexual assault on their campuses. However, even with rising concern about the sexual victimization of college students, there remains very little systematic information published about the content of sexual assault policies, protocols and programs that exist on college campuses. Focusing on the seven schools of the Oregon University System (OUS), this study sought to examine the schools' sexual assault policies, as well as their prevention and response efforts to sexual assault. Additionally schools' willingness for assistance and training from Oregon Sexual Assault Task Force (OSATF) was also studied. Specifically, official school sexual assault policies were content analysis and secondary survey data gathered by the OSATF was examined. Results demonstrated that, in most cases, policies of the OUS schools were vague in their definitions of what constituted a sexual assault, and lacked the additional information necessary for victims to respond to their sexual victimization. However, Universities also offered various forms of educational opportunities and awareness raising activities. While this proves promising, there is clearly room for improvement. OUS schools also appeared willing to work with the OSATF to improve the delivery of their sexual assault prevention services. The findings of this thesis are important in directing future actions of the OUS when developing and implementing sexual assault response and prevention strategies.

This study's objective was to examine the affect that migration and employment have on immigrant women's negotiating position within the household. Depth interviews were conducted with nine women who migrated to Portland, Oregon from Ethiopia or Eritrea. Women were encouraged to share a narrative history of their migration and employment experience. These interviews were analyzed to answer three primary questions: Who are immigrant women supporting through their participation in the paid labor market? How do women utilize gain access to employment opportunities and what strategies do women use once employed to meet competing demands on them at work and in the household? And finally, to what extent do women maintain control over their income and influence household decisions? This study found that women, particularly women who migrate prior to marriage, support natal households more than women who migrate after marriage. Women use social networks to find information about jobs, and once employed use an array of strategies to meet domestic demands. These strategies include joining households with other women to share household labor, finding employment opportunities that allow them to care for children while working, and having their mothers come to care for small children. Women who have recently married and have lived in the United States a short amount of time are most likely to express desire to maintain control over their income, while women who have lived in the United States for a longer time are more likely to pool their income with their husbands. Many women felt that they had an equal influence in household decisions as their husbands, but little evidence was provided that this was the case. Instead this study concludes that working outside of the home increases the perceived contribution that women make to the household leads to their empowerment and improves their negotiating position.

Portland, OR, is the site of a unique urban food cart phenomenon that provides opportunities for small business ownership and access points for culturally specific food for the city's foreign-born and minority populations. Known as a "foodie haven," Portland also has an active sustainable food movement with engaged citizens and support from city and regional policies aimed at significantly increasing the consumption of local food. To date, there have been no in-depth studies on the sourcing habits of Portland food cart owners and whether or not these street-level actors are involved in the area's local alternative food movements (AFNs). The current understanding of the Portland food cart phenomenon is based on studies that have focused on carts and pods located in the central business district and "inner-ring" areas of the city. Areas beyond these locations (defined as Eastern Portland) are currently home to the majority of the city's growing foreign-born and minority populations. This thesis uses a situational analysis framework to explore the food supply practices of ethnic food cart owners operating in Eastern Portland cart pods. I investigate the feasibility of purchasing locally grown ingredients for use in ethnic cuisines and the degree to which cart owners incorporate the region's prevailing locavore ethics into their everyday culinary practices. Findings from this inquiry suggest that ethnic cart owners in Eastern Portland have a range of habitus, or personal dispositions and embodied knowledge, that is reflected in how they perceive the benefits of and barriers to "buying local" and the extent (if any) that they engage with AFNs in the Portland area. I assert that ethnic food cart owners in Eastern Portland are performing multiple community roles by providing access points for culturally specific cuisines for their particular ethnic groups, while also offering exotic experiences to other residents and tourists alike. I discuss variations within the food cart phenomenon itself by highlighting the differences in design, amenities, types of access, and neighborhood customer bases of cart pods located in Eastern Portland. Finally, I discuss future research directions for understanding the dynamics of food supply chains in small-scale, direct-to-vendor relationships and the implications for local and regional food sustainability policy goals.

The Stephens Creek Watershed in southwest Portland, Oregon was chosen by the city as a pilot project for urban stream restoration efforts, and the infiltration of stormwater was identified as a potential restoration strategy. The Stephens Creek Watershed has historically been known to be unstable during high precipitation events (Burns, 1996), and the need to address the response of slope stability to anthropogenically-driven changing groundwater conditions is the focus of this study. Airborne light detection and ranging (LiDAR) and geotechnical data from the City of Portland were employed to create a high resolution (0.84 m2) physics-based probabilistic slope stability model for this watershed, using the map-based probabilistic infinite slope analysis program PISA-m (Haneberg, 2007). Best and worst case models were run using fully dry and fully saturated soil conditions, respectively. Model results indicate that 96.3% of the watershed area had a probability [less than or equal to] 0.25 that the slope factor of safety (FOS) was [less than or equal to] 1 for fully dry conditions, compared to 76.4% for fully saturated conditions. Areas that had a probability [greater than or equal to] 0.25 that the slope factor of safety (FOS) was [less than or equal to] 1 were found to occur mainly along cut/fill slopes as well as within the deeply incised canyons of Stephens Creek and its tributaries. An infiltration avoidance map was derived to define areas that appear to be unsuitable for infiltration. Based on these results, it is recommended that stormwater continues to be directed to existing sewer infrastructure and that the "storm water disconnect" restoration approach not be used by the city.

The middle Holocene cataclysmic eruption of Mount Mazama blanketed Walker Rim, in south central Oregon, with 270 cm to 300 cm of pumice, causing capture of surface water systems by groundwater, stream relocation, and the formation of biologically diverse fens and seasonal wetlands. The pumice aquifer at Round Meadow, an 8.6 km2 basin, hosts both a fen and seasonally ponded wetlands. The Round Meadow watershed lies within a closed basin between the upper Klamath and Deschutes river basins. As the highest meadow at Walker Rim, it is a relatively well-constrained system to study the effects of hydrological disruption. A water budget was calculated for the basin, hydraulic conductivity was evaluated for the three main sediment layers in the meadow, recharge sources and evaporative trends were studied using stable isotope analysis, and aquifer residence times were estimated using CFC tracer water age dating. Water year 2014 was a drought year and observation of the system under stressed conditions allowed discrimination of four independently functioning components of the hydrogeologic system. These were the meadow, which is by far the largest component in terms of water storage, the fen where iron cementation and up to 1 m of peat holds water in a berm above the meadow, three springs which are sourced from deeper groundwater hosted in the bedrock which underlies the pumice deposit, and the outflow area. In all cases, the aquifer material is pumice, but the influence of the pre-eruption landscape and post-eruption modifications of the aquifer material have resulted in partial isolation of the components. The water budget analysis indicated that the basin lost 44 cm of water storage during WY 2014. Hydraulic conductivity values of 1x10-6, 2x10-2, and 4x10-5 cm/s, were determined for the diatomaceous silt underlying the pumice, the Plinian pumice fall aquifer, and for the diatomaceous silt overlying the pumice, respectively. The pumice is characterized as a perched, weakly confined aquifer and residence times in the pumice are much longer (decades) than for water near the surface of the meadow. Water discharging at the springs is isotopically different (lighter) than either the surface water or groundwater in the pumice aquifer. The fen at Round Meadow appears dependent on seasonal precipitation to recharge water, and responds to fluctuations in annual precipitation. The wetland meadows are volumetrically the main water-storing features at Round Meadow, and these are not homogenous features, but a combination of discrete components.