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An evaluation of biological control of Linaria dalmatica with Mecinus janthinus in Oregon

Creator:: Park, Alexander
Abstract:: Dalmatian toadflax (Linaria dalmatica) has become a prolific invasive plant of rangelands in Oregon since its arrival in the early 20th century. In 2001, the Oregon Department of Agriculture initiated a release program promoting the distribution of the stem-boring weevil, Mecinus janthinus as classical biological control agent to reduce densities...
Resource Type:: Masters Thesis
Full Text:: : ______________________________________________________ Douglas E. Johnson Dalmatian toadflax (Linaria dalmatica) has become a prolific invasive

Growth responses of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) to defoliation

Creator:: Osman, Khalid Amir
Abstract:: The effect of defoliation intensity and season on Douglas-fir growth were studied in three replications in the Siuslaw National Forest during 1988-1990. Four intensities of defoliation were applied once in either spring or summer 1988. Stem diameter and canopy area were linearly inversely proportional to the level of defoliation. Defoliation...
Resource Type:: Dissertation
Full Text:: lliff for his support and encouragement, Dr. Douglas Johnson. I enjoyed working with you Dr. Johnson

Small broomrape (Orobanche minor) management using wheat (Triticum aestivum) as a false host

Creator:: Al-thahabi, Salam A.
Abstract:: Small broomrape (Orobanche minor) is an obligate, chlorophyll-lacking parasite that parasitizes red clover (Trifolium pratense) roots. This study was conducted to develop and implement an integrated, biologically based control program for small broomrape by using wheat as a false host to reduce the soil seed bank. The relationship between temperature...
Resource Type:: Dissertation
Full Text:: graduate committee of Dr. Thomas Chastain, Dr. Kenneth Johnson, and Dr. Paul Doescher for serving on my

Effects of prescribed fire on Wyoming big sagebrush communities : implications for ecological restoration of sage grouse habitat

Creator:: Wrobleski, David W.
Resource Type:: Masters Thesis
Full Text:: David W. Wrobleski for the degree of Master of Science in Wildlife Science presented on April 15, 1999

Growth characteristics and site potentials of perennial grass species

Creator:: Borman, Michael M.
Abstract:: In this study I assessed the potentials of selected, established perennial grasses to maintain site occupancy in the foothills ecosystem of the Rogue River Valley of southwest Oregon which is currently dominated by a variety of annual plants. The first evaluation compared growth curves of the perennial grasses and contrasted...
Resource Type:: Dissertation
Full Text:: an interest in those fields that I intend to pursue. Dr. Douglas Johnson and I have worked together

Greater sage-grouse reproductive ecology : linkages among habitat resources, maternal nutrition, and chick survival

Creator:: Gregg, Michael A.
Abstract:: Greater sage-grouse (Centrocercus urophasianus) populations declined range wide during the past 50 years. Grouse populations were 2-3 times larger than the current population as recently as the early 1970's. In addition to habitat loss and fragmentation, declines were attributed habitat degradation that caused reduced productivity. Because chick survival remains the...
Resource Type:: Dissertation
Full Text:: development (Johnson and Boyce 1990). Little information is available on direct linkages between chick

Biology and management of glyphosate-resistant creeping bentgrass

Creator:: Hancock, Daniel M.
Abstract:: A two year study was conducted at two locations to determine the effect of three perennial ryegrass (Lolium perenne L.) row spacings on creeping bentgrass (Agrostis stolonfera L.) biomass and seed production. At Location 1 in 2002, the creeping bentgrass biomass within the 7.62 cm row spacing was less than...
Resource Type:: Masters Thesis
Full Text:: :185-193. Johnson, J. W., W. L. Hargrove, and R. B. Moss. 1988. Optimizing row spacing and seeding

Farmer perspectives on success and challenges : a study of small farms in Oregon's Willamette Valley

Creator:: Pool, Kristin E.
Abstract:: This thesis investigates the success of and challenges facing small farmers operating direct marketing farm businesses in Oregon's Willamette Valley. This qualitative study utilizes participatory methods to gain the unique perspectives of small farmers regarding their success and challenges. Small farms are important players in local food systems and ensuring...
Resource Type:: Masters Thesis
Full Text:: of work time) Farm Size Fa m ily F ar m s. Fa rm s w he re t he o pe ra to r an d

Associations Between Crested Wheatgrass and Native Vegetation in Southeastern Oregon : An Investigation of Co-establishment, Environment, Seeding History, and Livestock management

Creator:: Nafus, Aleta M.
Abstract:: Crested wheatgrass (Agropyron cristatum [L] Gaertm), an introduced bunchgrass, has been seeded on over 5 million hectares of degraded rangeland in western North America because it establishes more readily than native bunchgrasses. Because crested wheatgrass stands are associated with native species displacement and low biological diversity, there is substantial interest...
Resource Type:: Dissertation
Full Text:: : ______________________________________________________ Kirk W. Davies Tony J. Svejcar Crested wheatgrass (Agropyron cristatum [L] Gaertm), an

Spatial and age class analysis of managed western juniper (Juniperus occidentalis) woodlands in central Oregon

Creator:: Zophy, Kelley T.
Abstract:: Juniper is a native species to Oregon and confers ecological benefits to wildlife when it is at savannah and transitional densities. Its range and extent have fluctuated with climatic change, but the current range expansion is unprecedented in its extent. The range expansion has been associated with the degradation of...
Resource Type:: Masters Thesis
Full Text:: 11 successional juniper woodlands. Johnson and Miller (2006) found that topographical features in

ScholarsArchive@OSU

An evaluation of biological control of Linaria dalmatica with Mecinus janthinus in Oregon

Growth responses of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) to defoliation

Small broomrape (Orobanche minor) management using wheat (Triticum aestivum) as a false host

Effects of prescribed fire on Wyoming big sagebrush communities : implications for ecological restoration of sage grouse habitat

Growth characteristics and site potentials of perennial grass species

Greater sage-grouse reproductive ecology : linkages among habitat resources, maternal nutrition, and chick survival

Biology and management of glyphosate-resistant creeping bentgrass

Farmer perspectives on success and challenges : a study of small farms in Oregon's Willamette Valley

Associations Between Crested Wheatgrass and Native Vegetation in Southeastern Oregon : An Investigation of Co-establishment, Environment, Seeding History, and Livestock management

Spatial and age class analysis of managed western juniper (Juniperus occidentalis) woodlands in central Oregon

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